Merge pull request #90 from AliSoftware/release/4.5.0

Release 4.5.0

.gitignore

@@ -32,3 +32,7 @@ Carthage
 # `pod install` in .travis.yml
 #
 # Pods/
+
+# SPM
+.build/
+Packages

.travis.yml

@@ -1,15 +1,41 @@
-language: objective-c
-osx_image: xcode7
+env:
+  global:
+    - MODULE_NAME=Dip
 
-# cache: cocoapods
-# before_install:
-# - gem install cocoapods # Since Travis is not always on latest version
-
-install:
-- gem install xcpretty --no-rdoc --no-ri --no-document --quiet
-
-script:
-- set -o pipefail && xcodebuild test -workspace Dip.xcworkspace -scheme Dip -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 6,OS=latest' ONLY_ACTIVE_ARCH=NO | xcpretty -c
-- set -o pipefail && xcodebuild test -workspace Dip.xcworkspace -scheme DipSampleApp -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 6,OS=latest' ONLY_ACTIVE_ARCH=NO | xcpretty -c
-- pod lib lint --quick
+matrix:
+  allow_failures:
+    - os: linux
+  include:
+    - script:
+        - set -o pipefail && xcodebuild test -workspace Dip.xcworkspace -scheme Dip-iOS -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 6,OS=latest' ONLY_ACTIVE_ARCH=NO | xcpretty -c
+        - set -o pipefail && xcodebuild test -workspace Dip.xcworkspace -scheme Dip-OSX -sdk macosx -destination 'platform=OS X,arch=x86_64' ONLY_ACTIVE_ARCH=NO | xcpretty -c
+        - set -o pipefail && xcodebuild test -workspace Dip.xcworkspace -scheme Dip-tvOS -sdk appletvsimulator -destination 'platform=tvOS Simulator,name=Apple TV 1080p,OS=latest' ONLY_ACTIVE_ARCH=NO | xcpretty -c
+        - set -o pipefail && xcodebuild -workspace Dip.xcworkspace -scheme Dip-watchOS -sdk watchsimulator -destination 'platform=watchOS Simulator,name=Apple Watch - 38mm,OS=latest' ONLY_ACTIVE_ARCH=NO | xcpretty - c
+        - set -o pipefail && xcodebuild test -workspace Dip.xcworkspace -scheme DipSampleApp -sdk iphonesimulator -destination 'platform=iOS Simulator,name=iPhone 6,OS=latest' ONLY_ACTIVE_ARCH=NO | xcpretty -c
+        - pod lib lint --quick
+        - carthage build --no-skip-current
+      os: osx
+      osx_image: xcode7.3
+      language: objective-c
+    - script:
+        - swift build
+      os: linux
+      dist: trusty
+      sudo: required
+      language: generic
+      before_install:
+        - wget -q -O - https://swift.org/keys/all-keys.asc | gpg --import -
+        - cd ..
+        - export SWIFT_VERSION=swift-DEVELOPMENT-SNAPSHOT-2016-05-09-a
+        - wget https://swift.org/builds/development/ubuntu1404/$SWIFT_VERSION/$SWIFT_VERSION-ubuntu14.04.tar.gz
+        - tar xzf $SWIFT_VERSION-ubuntu14.04.tar.gz
+        - export PATH="${PWD}/${SWIFT_VERSION}-ubuntu14.04/usr/bin:${PATH}"
+        - export SWIFT_RELEASE_VERSION=2.2.1
+        - export SWIFT_RELEASE_NAME="${SWIFT_RELEASE_VERSION}-RELEASE"
+        - wget https://swift.org/builds/swift-$SWIFT_RELEASE_VERSION-release/ubuntu1404/swift-$SWIFT_RELEASE_NAME/swift-$SWIFT_RELEASE_NAME-ubuntu14.04.tar.gz 
+        - tar xzf swift-$SWIFT_RELEASE_NAME-ubuntu14.04.tar.gz
+        - export SWIFT_EXEC="${PWD}/swift-${SWIFT_RELEASE_NAME}-ubuntu14.04/usr/bin/swiftc"
+        - cd $MODULE_NAME
 
+notifications:
+  email: false

CHANGELOG.md

@@ -1,5 +1,119 @@
 # CHANGELOG
 
+## 4.5.0
+
+* Added weakly-typed API to resolve components when exact type is unknown during compile time.  
+  [#79](https://github.com/AliSoftware/Dip/pull/79), [@ilyapuchka](https://github.com/ilyapuchka)
+* Added type forwarding feature. You can register the same factory to resolve different types.  
+  [#89](https://github.com/AliSoftware/Dip/pull/89), [@ilyapuchka](https://github.com/ilyapuchka) 
+* Container now can resolve optional types :tada:  
+  [#84](https://github.com/AliSoftware/Dip/pull/84), [@ilyapuchka](https://github.com/ilyapuchka)
+* Added container context that provides contextual information during graph resolution process.  
+  [#83](https://github.com/AliSoftware/Dip/pull/83), [@ilyapuchka](https://github.com/ilyapuchka)
+* Added method to validate container configuration.  
+  [#87](https://github.com/AliSoftware/Dip/pull/87), [@ilyapuchka](https://github.com/ilyapuchka)
+* Added method to manually set value wrapped by auto-injection wrappers.  
+  [#81](https://github.com/AliSoftware/Dip/pull/81), [@ilyapuchka](https://github.com/ilyapuchka)
+* Added separate error type for failures during auto-wiring.  
+  [#85](https://github.com/AliSoftware/Dip/pull/85), [@ilyapuchka](https://github.com/ilyapuchka)
+
+
+## 4.4.0
+
+* Added `.EagerSingleton` scope for objectes requiring early instantiation and `bootstrap()` method on `DepenencyContainer`.  
+  [#65](https://github.com/AliSoftware/Dip/pull/65), [@ilyapuchka](https://github.com/ilyapuchka)
+* Reverted order of `Resolvable` callbacks.  
+  [#67](https://github.com/AliSoftware/Dip/pull/67), [@ilyapuchka](https://github.com/ilyapuchka)
+
+## 4.3.1
+
+* Fix Swift 2.2 compile errors in tests.  
+  [#62](https://github.com/AliSoftware/Dip/pull/62), [@mwoollard](https://github.com/mwoollard)
+
+## 4.3.0
+
+* Added `DependencyTagConvertible` protocol for better typed tags.  
+  [#50](https://github.com/AliSoftware/Dip/pull/50), [@gavrix](https://github.com/gavrix)
+* Auto-wiring. `DependencyContainer` resolves constructor arguments automatically.  
+  [#55](https://github.com/AliSoftware/Dip/pull/55), [@ilyapuchka](https://github.com/ilyapuchka)
+* Added `Resolvable` protocol to get a callback when dependencies graph is complete.  
+  [#57](https://github.com/AliSoftware/Dip/pull/57), [@ilyapuchka](https://github.com/ilyapuchka)
+* Removed `DipError.ResolutionFailed` error for better consistency.  
+  [#58](https://github.com/AliSoftware/Dip/pull/58), [@ilyapuchka](https://github.com/ilyapuchka)
+
+
+## 4.2.0
+
+* Added support for Swift Package Manager.  
+  [#41](https://github.com/AliSoftware/Dip/pull/41), [@ilyapuchka](https://github.com/ilyapuchka)
+* Added Linux support.  
+  [#42](https://github.com/AliSoftware/Dip/pull/42), [#46](https://github.com/AliSoftware/Dip/pull/46), [@ilyapuchka](https://github.com/ilyapuchka)
+* Fixed the issue that could cause singleton instances to be reused between different containers.  
+  [#43](https://github.com/AliSoftware/Dip/pull/43), [@ilyapuchka](https://github.com/ilyapuchka)
+* Added public `AutoInjectedPropertyBox` protocol for user-defined auto-injected property wrappers.  
+  [#49](https://github.com/AliSoftware/Dip/pull/49), [@ilyapuchka](https://github.com/ilyapuchka)
+
+
+## 4.1.0
+
+#### New features
+
+* Added auto-injection feature.  
+  [#13](https://github.com/AliSoftware/Dip/pull/13), [@ilyapuchka](https://github.com/ilyapuchka)
+* Factories and `resolveDependencies` blocks of `DefinitionOf` are now allowed to `throw`. Improved errors handling.  
+  [#32](https://github.com/AliSoftware/Dip/pull/32), [@ilyapuchka](https://github.com/ilyapuchka)
+* Thread safety reimplemented with support for recursive methods calls.  
+  [#31](https://github.com/AliSoftware/Dip/pull/31), [@mwoollard](https://github.com/mwoollard)
+
+
+## 4.0.0
+
+#### New Features
+
+* Added support for circular dependencies:
+    * Added `ObjectGraph` scope to reuse resolved instances 
+    * Added `resolveDependencies` method on `DefinitionOf` class to resolve dependencies of resolved instance.  
+  [#11](https://github.com/AliSoftware/Dip/pull/11), [@ilyapuchka](https://github.com/ilyapuchka)
+* Added methods to register/remove individual definitions.  
+  [#11](https://github.com/AliSoftware/Dip/pull/11), [@ilyapuchka](https://github.com/ilyapuchka)
+* All `resolve` methods now can throw error if type can not be resolved.  
+  [#15](https://github.com/AliSoftware/Dip/issues/15), [@ilyapuchka](https://github.com/ilyapuchka)
+* `DependencyContainer` is marked as `final`.
+* Added support for OSX, tvOS and watchOS2.  
+  [#26](https://github.com/AliSoftware/Dip/pull/26), [@ilyapuchka](https://github.com/ilyapuchka)
+
+
+#### Breaking Changes
+
+* Removed container thread-safety to enable recursion calls to `resolve`.  
+  **Access to container from multiple threads should be handled by clients** from now on.
+* All `resolve` methods now can throw.
+
+	### Note on migration from 3.x to 4.0.0:
+	* Errors
+
+	In 4.0.0 each `resolve` method can throw `DefinitionNotFound(DefinitionKey)` error, so you need to call it using `try!` or `try?`, or catch the error if it's appropriate for your case. See [#15](https://github.com/AliSoftware/Dip/issues/15) for rationale of this change.
+	
+	* Thread safety
+
+	In 4.0.0 `DependencyContainer` drops any guarantee of thread safety. From now on code that uses Dip must ensure that it's methods are called from a single thread. For example if you have registered type as a singleton and later two threads try to resolve it at the same time you can have two different instances of type instead of one as expected. This change was required to enable recursive calls of `resolve` method to resolve circular dependencies.
+	
+	* Removed methods
+
+	Methods deprecated in 3.1.0 are now removed.
+
+
+## 3.1.0
+
+#### New
+
+* Added name for the first runtime argument in `resolve(tag:withArguments: … )` methods to make more clear separation between tag and factory runtime arguments.
+
+#### Depreciations
+
+* `resolve(tag:_: … )` methods are deprecated in favor of those new `resolve(tag:withArguments: … )` methods.
+* Deprecated `register(tag:instance:)` method in favor of `register(.Singleton) { … }`.
+
 ## 3.0.0
 
 * Added support for factories with up to six runtime arguments.  
@@ -7,6 +121,27 @@
 * Parameter `tag` is now named in all register/resolve methods.
 * Playground added to project.  
   [#10](https://github.com/AliSoftware/Dip/pull/10), [@ilyapuchka](https://github.com/ilyapuchka)
+  
+  ### Note on migration from 2.0.0 to 3.0.0:
+
+  If you used tags to register and resolve your components you have to add `tag` name for tag parameter. Don't forget to add it both in `register` and `resolve` methods. If you forget to add it in `resolve` call then tag value will be treated as first runtime argument for a factory, but there is no such factory registerd, so resolve will fail.
+  
+  **Example**:
+  
+  This code: 
+  
+  ```swift
+  container.register("some tag") { SomeClass() as SomeProtocol }
+  container.resolve("some tag") as SomeProtocol
+  ```
+  
+  becomes this:
+  
+  ```swift
+  container.register(tag: "some tag") { SomeClass() as SomeProtocol }
+  container.resolve(tag: "some tag") as SomeProtocol
+  ```
+  
 
 ## 2.0.0
 

Dip.podspec

@@ -1,30 +1,26 @@
 Pod::Spec.new do |s|
   s.name             = "Dip"
-  s.version          = "3.0.0"
-  s.summary          = "A simple Dependency Resolver: Dependency Injection using Protocol resolution."
+  s.version          = "4.5.0"
+  s.summary          = "Dependency Injection for Swift made easy."
 
   s.description      = <<-DESC
-                        Dip is a Swift framework to manage your Dependencies between your classes
-                        in your app using Dependency Injection.
-
-                        It's aimed to be very simple to use while improving testability
-                        of your app by allowing you to get rid of those sharedInstances and instead
-                        inject values based on protocol resolution.
-
-                        Define your API using a protocol, then ask Dip to resolve this protocol into
-                        an instance dynamically in your classes. Then your App and your Tests can be
-                        configured to resolve the protocol using a different instance or class so this
-                        improve testability by decoupling the API and the concrete class used to implement it.
-                       DESC
+                        Dip is a Swift Dependency Injection Container.
+                        It provides reusable functionality for managing dependencies of your types 
+                        and will help you to wire up different parts of your app.
+                        DESC
 
   s.homepage         = "https://github.com/AliSoftware/Dip"
   s.license          = 'MIT'
-  s.author           = { "Olivier Halligon" => "olivier@halligon.net" }
+  s.authors          = { "Olivier Halligon" => "olivier@halligon.net", "Ilya Puchka" => "ilya@puchka.me" }
   s.source           = { :git => "https://github.com/AliSoftware/Dip.git", :tag => s.version.to_s }
   s.social_media_url = 'https://twitter.com/aligatr'
 
-  s.platform     = :ios, '8.0'
+  s.ios.deployment_target = '8.0'
+  s.osx.deployment_target = '10.9'
+  s.tvos.deployment_target = '9.0'
+  s.watchos.deployment_target = '2.0'
+
   s.requires_arc = true
 
-  s.source_files = 'Dip/Dip/**/*'
+  s.source_files = 'Sources/**/*.swift'
 end

Dip/Dip.xcodeproj/xcshareddata/xcschemes/Dip-OSX.xcscheme

@@ -14,9 +14,9 @@
             buildForAnalyzing = "YES">
             <BuildableReference
                BuildableIdentifier = "primary"
-               BlueprintIdentifier = "094526901BEA1CFF0034E72A"
+               BlueprintIdentifier = "0903B3571C161543002241C1"
                BuildableName = "Dip.framework"
-               BlueprintName = "Dip"
+               BlueprintName = "Dip-OSX"
                ReferencedContainer = "container:Dip.xcodeproj">
             </BuildableReference>
          </BuildActionEntry>
@@ -32,9 +32,9 @@
             skipped = "NO">
             <BuildableReference
                BuildableIdentifier = "primary"
-               BlueprintIdentifier = "0945269A1BEA1CFF0034E72A"
-               BuildableName = "DipTests.xctest"
-               BlueprintName = "DipTests"
+               BlueprintIdentifier = "0903B3601C161543002241C1"
+               BuildableName = "Dip-OSXTests.xctest"
+               BlueprintName = "Dip-OSXTests"
                ReferencedContainer = "container:Dip.xcodeproj">
             </BuildableReference>
          </TestableReference>
@@ -42,9 +42,9 @@
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "094526901BEA1CFF0034E72A"
+            BlueprintIdentifier = "0903B3571C161543002241C1"
             BuildableName = "Dip.framework"
-            BlueprintName = "Dip"
+            BlueprintName = "Dip-OSX"
             ReferencedContainer = "container:Dip.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
@@ -64,9 +64,9 @@
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "094526901BEA1CFF0034E72A"
+            BlueprintIdentifier = "0903B3571C161543002241C1"
             BuildableName = "Dip.framework"
-            BlueprintName = "Dip"
+            BlueprintName = "Dip-OSX"
             ReferencedContainer = "container:Dip.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
@@ -82,9 +82,9 @@
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "094526901BEA1CFF0034E72A"
+            BlueprintIdentifier = "0903B3571C161543002241C1"
             BuildableName = "Dip.framework"
-            BlueprintName = "Dip"
+            BlueprintName = "Dip-OSX"
             ReferencedContainer = "container:Dip.xcodeproj">
          </BuildableReference>
       </MacroExpansion>

Dip/Dip.xcodeproj/xcshareddata/xcschemes/Dip-iOS.xcscheme

@@ -0,0 +1,100 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0710"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "0903B3771C1615EC002241C1"
+               BuildableName = "Dip.framework"
+               BlueprintName = "Dip-iOS"
+               ReferencedContainer = "container:Dip.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      codeCoverageEnabled = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "0903B3801C1615EC002241C1"
+               BuildableName = "Dip-iOSTests.xctest"
+               BlueprintName = "Dip-iOSTests"
+               ReferencedContainer = "container:Dip.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0903B3771C1615EC002241C1"
+            BuildableName = "Dip.framework"
+            BlueprintName = "Dip-iOS"
+            ReferencedContainer = "container:Dip.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0903B3771C1615EC002241C1"
+            BuildableName = "Dip.framework"
+            BlueprintName = "Dip-iOS"
+            ReferencedContainer = "container:Dip.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0903B3771C1615EC002241C1"
+            BuildableName = "Dip.framework"
+            BlueprintName = "Dip-iOS"
+            ReferencedContainer = "container:Dip.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Dip/Dip.xcodeproj/xcshareddata/xcschemes/Dip-tvOS.xcscheme

@@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0710"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "0903B3A51C1618AF002241C1"
+               BuildableName = "Dip.framework"
+               BlueprintName = "Dip-tvOS"
+               ReferencedContainer = "container:Dip.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "0903B3AE1C1618AF002241C1"
+               BuildableName = "Dip-tvOSTests.xctest"
+               BlueprintName = "Dip-tvOSTests"
+               ReferencedContainer = "container:Dip.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0903B3A51C1618AF002241C1"
+            BuildableName = "Dip.framework"
+            BlueprintName = "Dip-tvOS"
+            ReferencedContainer = "container:Dip.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0903B3A51C1618AF002241C1"
+            BuildableName = "Dip.framework"
+            BlueprintName = "Dip-tvOS"
+            ReferencedContainer = "container:Dip.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0903B3A51C1618AF002241C1"
+            BuildableName = "Dip.framework"
+            BlueprintName = "Dip-tvOS"
+            ReferencedContainer = "container:Dip.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Dip/Dip.xcodeproj/xcshareddata/xcschemes/Dip-watchOS.xcscheme

@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0710"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "0903B4031C162862002241C1"
+               BuildableName = "Dip.framework"
+               BlueprintName = "Dip-watchOS"
+               ReferencedContainer = "container:Dip.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0903B4031C162862002241C1"
+            BuildableName = "Dip.framework"
+            BlueprintName = "Dip-watchOS"
+            ReferencedContainer = "container:Dip.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0903B4031C162862002241C1"
+            BuildableName = "Dip.framework"
+            BlueprintName = "Dip-watchOS"
+            ReferencedContainer = "container:Dip.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Dip/Dip/Definition.swift

@@ -1,82 +0,0 @@
-//
-// Dip
-//
-// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
-// 
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-// 
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-// 
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-//
-
-import Foundation
-
-///Internal representation of a key used to associate definitons and factories by tag, type and factory.
-struct DefinitionKey : Hashable, Equatable, CustomDebugStringConvertible {
-  var protocolType: Any.Type
-  var factoryType: Any.Type
-  var associatedTag: DependencyContainer.Tag?
-  
-  var hashValue: Int {
-    return "\(protocolType)-\(factoryType)-\(associatedTag)".hashValue
-  }
-  
-  var debugDescription: String {
-    return "type: \(protocolType), factory: \(factoryType), tag: \(associatedTag)"
-  }
-}
-
-func ==(lhs: DefinitionKey, rhs: DefinitionKey) -> Bool {
-  return
-    lhs.protocolType == rhs.protocolType &&
-      lhs.factoryType == rhs.factoryType &&
-      lhs.associatedTag == rhs.associatedTag
-}
-
-///Describes the lifecycle of instances created by container.
-public enum ComponentScope {
-  /// Indicates that a new instance of the component will be created each time it's resolved.
-  case Prototype
-  /// Indicates that resolved component should be retained by container and always reused.
-  case Singleton
-}
-
-///Definition of type T describes how instances of this type should be created when they are resolved by container.
-public final class DefinitionOf<T>: Definition {
-  let factory: Any
-  let scope: ComponentScope
-  
-  init(factory: Any, scope: ComponentScope = .Prototype) {
-    self.factory = factory
-    self.scope = scope
-  }
-  
-  var resolvedInstance: T? {
-    get {
-      guard scope == .Singleton else { return nil }
-      return _resolvedInstance
-    }
-    set {
-      guard scope == .Singleton else { return }
-      _resolvedInstance = newValue
-    }
-  }
-  
-  private var _resolvedInstance: T?
-}
-
-///Dummy protocol to store definitions for different types in collection
-protocol Definition {}

Dip/Dip/Dip.h

@@ -1,9 +1,25 @@
 //
-//  Dip.h
-//  Dip
+// Dip
 //
-//  Created by Ilya Puchka on 04.11.15.
-//  Copyright © 2015 AliSoftware. All rights reserved.
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
 //
 
 #import <Foundation/Foundation.h>

Dip/Dip/Dip.swift

@@ -1,236 +0,0 @@
-//
-// Dip
-//
-// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
-// 
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-// 
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-// 
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-//
-
-import Foundation
-
-// MARK: - DependencyContainer
-
-/**
- * _Dip_'s Dependency Containers allow you to do very simple **Dependency Injection**
- * by associating `protocols` to concrete implementations
- */
-public class DependencyContainer {
-  
-  /**
-   Use a tag in case you need to register multiple instances or factories
-   with the same protocol, to differentiate them. Tags can be either String
-   or Int, to your convenience.
-   */
-  public enum Tag: Equatable {
-    case String(StringLiteralType)
-    case Int(IntegerLiteralType)
-  }
-  
-  private var dependencies = [DefinitionKey : Definition]()
-  private var lock: OSSpinLock = OS_SPINLOCK_INIT
-  
-  /**
-   Designated initializer for a DependencyContainer
-   
-   - parameter configBlock: A configuration block in which you typically put all you `register` calls.
-   
-   - note: The `configBlock` is simply called at the end of the `init` to let you configure everything. 
-           It is only present for convenience to have a cleaner syntax when declaring and initializing
-           your `DependencyContainer` instances.
-   
-   - returns: A new DependencyContainer.
-   */
-  public init(@noescape configBlock: (DependencyContainer->()) = { _ in }) {
-    configBlock(self)
-  }
-  
-  // MARK: - Reset all dependencies
-  
-  /**
-  Clear all the previously registered dependencies on this container.
-  */
-  public func reset() {
-    lockAndDo {
-      dependencies.removeAll()
-    }
-  }
-  
-  // MARK: Register dependencies
-  
-  /**
-  Register a Void->T factory associated with optional tag.
-  
-  - parameter tag: The arbitrary tag to associate this factory with when registering with that protocol. Pass `nil` to associate with any tag. Default value is `nil`.
-  - parameter factory: The factory to register, with return type of protocol you want to register it for
-  
-  - note: You must cast the factory return type to the protocol you want to register it with (e.g `MyClass() as MyAPI`)
-  */
-  public func register<T>(tag tag: Tag? = nil, factory: ()->T) -> DefinitionOf<T> {
-    return register(tag: tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
-  }
-  
-  /**
-   Register a Singleton instance associated with optional tag.
-   
-   - parameter tag: The arbitrary tag to associate this instance with when registering with that protocol. `nil` to associate with any tag.
-   - parameter instance: The instance to register, with return type of protocol you want to register it for
-   
-   - note: You must cast the instance to the protocol you want to register it with (e.g `MyClass() as MyAPI`)
-   */
-  public func register<T>(tag tag: Tag? = nil, @autoclosure(escaping) instance factory: ()->T) -> DefinitionOf<T> {
-    return register(tag: tag, factory: { factory() }, scope: .Singleton)
-  }
-  
-  /**
-   Register generic factory associated with optional tag.
-   
-   - parameter tag: The arbitrary tag to look for when resolving this protocol.
-   - parameter factory: generic factory that should be used to create concrete instance of type
-   - parameter scope: scope of the component. Default value is `Prototype`
-   
-   - note: You should not call this method directly, instead call any of other `register` methods.
-           You _should_ use this method only to register dependency with more runtime arguments
-           than _Dip_ supports (currently it's up to six) like in this example:
-   
-   ```swift
-   public func register<T, Arg1, Arg2, Arg3, ...>(tag: Tag? = nil, factory: (Arg1, Arg2, Arg3, ...) -> T) -> DefinitionOf<T> {
-     return register(tag: tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
-   }
-   ```
-   
-   Though before you do that you should probably review your design and try to reduce number of depnedencies.
-   
-   */
-  public func register<T, F>(tag tag: Tag? = nil, factory: F, scope: ComponentScope) -> DefinitionOf<T> {
-    let key = DefinitionKey(protocolType: T.self, factoryType: F.self, associatedTag: tag)
-    let definition = DefinitionOf<T>(factory: factory, scope: scope)
-    lockAndDo {
-      dependencies[key] = definition
-    }
-    return definition
-  }
-  
-  // MARK: Resolve dependencies
-  
-  /**
-  Resolve a dependency. 
-  
-  If no instance/factory was registered with this `tag` for this `protocol`, it will try to resolve the instance/factory associated with `nil` (no tag).
-  
-  - parameter tag: The arbitrary tag to look for when resolving this protocol.
-  */
-  public func resolve<T>(tag tag: Tag? = nil) -> T {
-    return resolve(tag: tag) { (factory: ()->T) in factory() }
-  }
-  
-  /**
-   Resolve a dependency using generic builder closure that accepts generic factory and returns created instance.
-   
-   - parameter tag: The arbitrary tag to look for when resolving this protocol.
-   - parameter builder: Generic closure that accepts generic factory and returns inctance produced by that factory
-   
-   - note: You should not call this method directly, instead call any of other `resolve` methods. (see `RuntimeArguments.swift`).
-           You _should_ use this method only to resolve dependency with more runtime arguments than _Dip_ supports
-           (currently it's up to six) like in this example:
-   
-   ```swift
-   public func resolve<T, Arg1, Arg2, Arg3, ...>(tag tag: Tag? = nil, _ arg1: Arg1, _ arg2: Arg2, _ arg3: Arg3, ...) -> T {
-     return resolve(tag: tag) { (factory: (Arg1, Arg2, Arg3, ...) -> T) in factory(arg1, arg2, arg3, ...) }
-   }
-   ```
-   
-   Though before you do that you should probably review your design and try to reduce the number of dependencies.
-   
-   */
-  public func resolve<T, F>(tag tag: Tag? = nil, builder: F->T) -> T {
-    let key = DefinitionKey(protocolType: T.self, factoryType: F.self, associatedTag: tag)
-    let nilTagKey = tag.map { _ in DefinitionKey(protocolType: T.self, factoryType: F.self, associatedTag: nil) }
-    
-    var resolved: T!
-    lockAndDo { [unowned self] in
-      resolved = self._resolve(key, nilTagKey: nilTagKey, builder: builder)
-    }
-    return resolved
-  }
-  
-  /// Actually resolve dependency
-  private func _resolve<T, F>(key: DefinitionKey, nilTagKey: DefinitionKey?, builder: F->T) -> T {
-    guard let definition = (self.dependencies[key] ?? self.dependencies[nilTagKey]) as? DefinitionOf<T> else {
-      fatalError("No instance factory registered with \(key) or \(nilTagKey)")
-    }
-    
-    if let resolvedInstance = definition.resolvedInstance {
-      return resolvedInstance
-    }
-    else {
-      let resolved = builder(definition.factory as! F)
-      definition.resolvedInstance = resolved
-      return resolved
-    }
-  }
-  
-  // MARK: - Private
-  
-  private func lockAndDo(@noescape block: Void->Void) {
-    OSSpinLockLock(&lock)
-    defer { OSSpinLockUnlock(&lock) }
-    block()
-  }
-}
-
-extension DependencyContainer.Tag: IntegerLiteralConvertible {
-  public init(integerLiteral value: IntegerLiteralType) {
-    self = .Int(value)
-  }
-}
-
-extension DependencyContainer.Tag: StringLiteralConvertible {
-  public typealias ExtendedGraphemeClusterLiteralType = StringLiteralType
-  public typealias UnicodeScalarLiteralType = StringLiteralType
-  
-  public init(stringLiteral value: StringLiteralType) {
-    self = .String(value)
-  }
-  
-  public init(unicodeScalarLiteral value: UnicodeScalarLiteralType) {
-    self.init(stringLiteral: value)
-  }
-  
-  public init(extendedGraphemeClusterLiteral value: ExtendedGraphemeClusterLiteralType) {
-    self.init(stringLiteral: value)
-  }
-}
-
-public func ==(lhs: DependencyContainer.Tag, rhs: DependencyContainer.Tag) -> Bool {
-  switch (lhs, rhs) {
-  case let (.String(lhsString), .String(rhsString)):
-    return lhsString == rhsString
-  case let (.Int(lhsInt), .Int(rhsInt)):
-    return lhsInt == rhsInt
-  default:
-    return false
-  }
-}
-
-extension Dictionary {
-  subscript(key: Key?) -> Value! {
-    guard let key = key else { return nil }
-    return self[key]
-  }
-}

Dip/Dip/RuntimeArguments.swift

@@ -1,118 +0,0 @@
-//
-// Dip
-//
-// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
-// 
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-// 
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-// 
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-//
-
-import Foundation
-
-// MARK: - Register/resolve dependencies with runtime arguments
-
-extension DependencyContainer {
-  
-  // MARK: 1 Runtime Argument
-  
-  /**
-  Registers factory that accepts one runtime argument. You can use up to six runtime arguments.
-  
-  - parameter tag: The arbitrary tag to associate this factory with when registering with that protocol.
-                   Pass `nil` to associate with any tag. Default value is `nil`.
-  - parameter factory: The factory to register, with return type of protocol you want to register it for
-  
-  - note: You can have several factories with different number or types of arguments registered to for same type.
-          When you resolve it container will match the type and tag as well as __number__, __types__ and __order__
-          of runtime arguments that you pass to `resolve` method.
-  
-  - seealso: `register(tag:factory:scope:)`
-  */
-  public func register<T, Arg1>(tag tag: Tag? = nil, factory: (Arg1) -> T) -> DefinitionOf<T> {
-    return register(tag: tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
-  }
-  
-  /**
-   Resolve a dependency with runtime argument. Factories will be matched by tag and the type to resolve as well
-   as __number__, __types__ and __order__ of runtime arguments that you pass to this method.
-   
-   - parameter tag: The arbitrary tag to look for when resolving this protocol.
-   - parameter arg1: First argument to be passed to factory
-   
-   - seealso: `resolve(tag:)`
-   */
-  public func resolve<T, Arg1>(tag tag: Tag? = nil, _ arg1: Arg1) -> T {
-    return resolve(tag: tag) { (factory: (Arg1) -> T) in factory(arg1) }
-  }
-  
-  // MARK: 2 Runtime Arguments
-  
-  /// - seealso: `register(:factory:scope:)`
-  public func register<T, Arg1, Arg2>(tag tag: Tag? = nil, factory: (Arg1, Arg2) -> T) -> DefinitionOf<T> {
-    return register(tag: tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
-  }
-  
-  /// - seealso: `resolve(tag:_:)`
-  public func resolve<T, Arg1, Arg2>(tag tag: Tag? = nil, _ arg1: Arg1, _ arg2: Arg2) -> T {
-    return resolve(tag: tag) { (factory: (Arg1, Arg2) -> T) in factory(arg1, arg2) }
-  }
-  
-  // MARK: 3 Runtime Arguments
-  
-  public func register<T, Arg1, Arg2, Arg3>(tag tag: Tag? = nil, factory: (Arg1, Arg2, Arg3) -> T) -> DefinitionOf<T> {
-    return register(tag: tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
-  }
-  
-  /// - seealso: `resolve(tag:_:)`
-  public func resolve<T, Arg1, Arg2, Arg3>(tag tag: Tag? = nil, _ arg1: Arg1, _ arg2: Arg2, _ arg3: Arg3) -> T {
-    return resolve(tag: tag) { (factory: (Arg1, Arg2, Arg3) -> T) in factory(arg1, arg2, arg3) }
-  }
-  
-  // MARK: 4 Runtime Arguments
-  
-  public func register<T, Arg1, Arg2, Arg3, Arg4>(tag tag: Tag? = nil, factory: (Arg1, Arg2, Arg3, Arg4) -> T) -> DefinitionOf<T> {
-    return register(tag: tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
-  }
-  
-  /// - seealso: `resolve(tag:_:)`
-  public func resolve<T, Arg1, Arg2, Arg3, Arg4>(tag tag: Tag? = nil, _ arg1: Arg1, _ arg2: Arg2, _ arg3: Arg3, _ arg4: Arg4) -> T {
-    return resolve(tag: tag) { (factory: (Arg1, Arg2, Arg3, Arg4) -> T) in factory(arg1, arg2, arg3, arg4) }
-  }
-  
-  // MARK: 4 Runtime Arguments
-  
-  public func register<T, Arg1, Arg2, Arg3, Arg4, Arg5>(tag tag: Tag? = nil, factory: (Arg1, Arg2, Arg3, Arg4, Arg5) -> T) -> DefinitionOf<T> {
-    return register(tag: tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
-  }
-  
-  /// - seealso: `resolve(tag:_:)`
-  public func resolve<T, Arg1, Arg2, Arg3, Arg4, Arg5>(tag tag: Tag? = nil, _ arg1: Arg1, _ arg2: Arg2, _ arg3: Arg3, _ arg4: Arg4, _ arg5: Arg5) -> T {
-    return resolve(tag: tag) { (factory: (Arg1, Arg2, Arg3, Arg4, Arg5) -> T) in factory(arg1, arg2, arg3, arg4, arg5) }
-  }
-  
-  // MARK: 5 Runtime Arguments
-  
-  public func register<T, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6>(tag tag: Tag? = nil, factory: (Arg1, Arg2, Arg3, Arg4, Arg5, Arg6) -> T) -> DefinitionOf<T> {
-    return register(tag: tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
-  }
-  
-  /// - seealso: `resolve(tag:_:)`
-  public func resolve<T, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6>(tag tag: Tag? = nil, _ arg1: Arg1, _ arg2: Arg2, _ arg3: Arg3, _ arg4: Arg4, _ arg5: Arg5, _ arg6: Arg6) -> T {
-    return resolve(tag: tag) { (factory: (Arg1, Arg2, Arg3, Arg4, Arg5, Arg6) -> T) in factory(arg1, arg2, arg3, arg4, arg5, arg6) }
-  }
-}

Dip/DipTests/DipTests.swift

@@ -1,111 +0,0 @@
-//
-//  DipTests.swift
-//  DipTests
-//
-//  Created by Ilya Puchka on 04.11.15.
-//  Copyright © 2015 AliSoftware. All rights reserved.
-//
-
-import XCTest
-@testable import Dip
-
-protocol Service {
-  func getServiceName() -> String
-}
-
-class ServiceImp1: Service {
-  func getServiceName() -> String {
-    return "ServiceImp1"
-  }
-}
-
-class ServiceImp2: Service {
-  func getServiceName() -> String {
-    return "ServiceImp2"
-  }
-}
-
-class DipTests: XCTestCase {
-  
-  let container = DependencyContainer()
-  
-  override func setUp() {
-    super.setUp()
-    container.reset()
-  }
-  
-  func testThatItResolvesInstanceRegisteredWithoutTag() {
-    //given
-    container.register { ServiceImp1() as Service }
-    
-    //when
-    let serviceInstance = container.resolve() as Service
-    
-    //then
-    XCTAssertTrue(serviceInstance is ServiceImp1)
-  }
-  
-  func testThatItResolvesInstanceRegisteredWithTag() {
-    //given
-    container.register(tag: "service") { ServiceImp1() as Service }
-    
-    //when
-    let serviceInstance = container.resolve(tag: "service") as Service
-    
-    //then
-    XCTAssertTrue(serviceInstance is ServiceImp1)
-  }
-  
-  func testThatItResolvesDifferentInstancesRegisteredForDifferentTags() {
-    //given
-    container.register(tag: "service1") { ServiceImp1() as Service }
-    container.register(tag: "service2") { ServiceImp2() as Service }
-    
-    //when
-    let service1Instance = container.resolve(tag: "service1") as Service
-    let service2Instance = container.resolve(tag: "service2") as Service
-    
-    //then
-    XCTAssertTrue(service1Instance is ServiceImp1)
-    XCTAssertTrue(service2Instance is ServiceImp2)
-  }
-  
-  func testThatNewRegistrationOverridesPreviousRegistration() {
-    //given
-    container.register { ServiceImp1() as Service }
-    let service1 = container.resolve() as Service
-    
-    //when
-    container.register { ServiceImp2() as Service }
-    let service2 = container.resolve() as Service
-    
-    //then
-    XCTAssertTrue(service1 is ServiceImp1)
-    XCTAssertTrue(service2 is ServiceImp2)
-  }
-  
-  func testThatItResolvesTypeAsNewInstanceEveryTime() {
-    //given
-    container.register { ServiceImp1() as Service }
-    
-    //when
-    let service1 = container.resolve() as Service
-    let service2 = container.resolve() as Service
-    
-    //then
-    XCTAssertFalse((service1 as! ServiceImp1) === (service2 as! ServiceImp1))
-  }
-  
-  func testThatItReusesInstanceRegisteredAsSingleton() {
-    //given
-    container.register(instance: ServiceImp1() as Service)
-    
-    //when
-    let service1 = container.resolve() as Service
-    let service2 = container.resolve() as Service
-    
-    //then
-    XCTAssertTrue((service1 as! ServiceImp1) === (service2 as! ServiceImp1))
-  }
-  
-}

Dip/DipTests/RuntimeArgumentsTests.swift

@@ -1,217 +0,0 @@
-//
-//  RuntimeArgumentsTests.swift
-//  DipTests
-//
-//  Created by Ilya Puchka on 04.11.15.
-//  Copyright © 2015 AliSoftware. All rights reserved.
-//
-
-import XCTest
-@testable import Dip
-
-class ServiceImp3: Service {
-  
-  let name: String
-  
-  init(name: String, baseURL: NSURL, port: Int) {
-    self.name = name
-  }
-  
-  func getServiceName() -> String {
-    return name
-  }
-}
-
-class RuntimeArgumentsTests: XCTestCase {
-  
-  let container = DependencyContainer()
-  
-  override func setUp() {
-    super.setUp()
-    container.reset()
-  }
-  
-  func testThatItResolvesInstanceWithOneArgument() {
-    //given
-    let arg1 = 1
-    container.register { (a1: Int) -> Service in
-      XCTAssertEqual(a1, arg1)
-      return ServiceImp1()
-    }
-    
-    //when
-    let service = container.resolve(arg1) as Service
-    
-    //then
-    XCTAssertTrue(service is ServiceImp1)
-  }
-  
-  func testThatItResolvesInstanceWithTwoArguments() {
-    //given
-    let arg1 = 1, arg2 = 2
-    container.register { (a1: Int, a2: Int) -> Service in
-      XCTAssertEqual(a1, arg1)
-      XCTAssertEqual(a2, arg2)
-      return ServiceImp1()
-    }
-    
-    //when
-    let service = container.resolve(arg1, arg2) as Service
-    
-    //then
-    XCTAssertTrue(service is ServiceImp1)
-  }
-  
-  func testThatItResolvesInstanceWithThreeArguments() {
-    let arg1 = 1, arg2 = 2, arg3 = 3
-    container.register { (a1: Int, a2: Int, a3: Int) -> Service in
-      XCTAssertEqual(a1, arg1)
-      XCTAssertEqual(a2, arg2)
-      XCTAssertEqual(a3, arg3)
-      return ServiceImp1()
-    }
-    
-    //when
-    let service = container.resolve(arg1, arg2, arg3) as Service
-    
-    //then
-    XCTAssertTrue(service is ServiceImp1)
-  }
-  
-  func testThatItResolvesInstanceWithFourArguments() {
-    let arg1 = 1, arg2 = 2, arg3 = 3, arg4 = 4
-    container.register { (a1: Int, a2: Int, a3: Int, a4: Int) -> Service in
-      XCTAssertEqual(a1, arg1)
-      XCTAssertEqual(a2, arg2)
-      XCTAssertEqual(a3, arg3)
-      XCTAssertEqual(a4, arg4)
-      return ServiceImp1()
-    }
-    
-    //when
-    let service = container.resolve(arg1, arg2, arg3, arg4) as Service
-    
-    //then
-    XCTAssertTrue(service is ServiceImp1)
-  }
-  
-  func testThatItResolvesInstanceWithFiveArguments() {
-    let arg1 = 1, arg2 = 2, arg3 = 3, arg4 = 4, arg5 = 5
-    container.register { (a1: Int, a2: Int, a3: Int, a4: Int, a5: Int) -> Service in
-      XCTAssertEqual(a1, arg1)
-      XCTAssertEqual(a2, arg2)
-      XCTAssertEqual(a3, arg3)
-      XCTAssertEqual(a4, arg4)
-      XCTAssertEqual(a5, arg5)
-      return ServiceImp1()
-    }
-    
-    //when
-    let service = container.resolve(arg1, arg2, arg3, arg4, arg5) as Service
-    
-    //then
-    XCTAssertTrue(service is ServiceImp1)
-  }
-  
-  func testThatItResolvesInstanceWithSixArguments() {
-    let arg1 = 1, arg2 = 2, arg3 = 3, arg4 = 4, arg5 = 5, arg6 = 6
-    container.register { (a1: Int, a2: Int, a3: Int, a4: Int, a5: Int, a6: Int) -> Service in
-      XCTAssertEqual(a1, arg1)
-      XCTAssertEqual(a2, arg2)
-      XCTAssertEqual(a3, arg3)
-      XCTAssertEqual(a4, arg4)
-      XCTAssertEqual(a5, arg5)
-      XCTAssertEqual(a6, arg6)
-      return ServiceImp1()
-    }
-    
-    //when
-    let service = container.resolve(arg1, arg2, arg3, arg4, arg5, arg6) as Service
-    
-    //then
-    XCTAssertTrue(service is ServiceImp1)
-  }
-  
-  func testThatItRegistersDifferentFactoriesForDifferentNumberOfArguments() {
-    //given
-    let arg1 = 1, arg2 = 2
-    container.register { (a1: Int) in ServiceImp1() as Service }
-    container.register { (a1: Int, a2: Int) in ServiceImp2() as Service }
-    
-    //when
-    let service1 = container.resolve(arg1) as Service
-    let service2 = container.resolve(arg1, arg2) as Service
-    
-    //then
-    XCTAssertTrue(service1 is ServiceImp1)
-    XCTAssertTrue(service2 is ServiceImp2)
-  }
-  
-  func testThatItRegistersDifferentFactoriesForDifferentTypesOfArguments() {
-    //given
-    let arg1 = 1, arg2 = "string"
-    container.register { (a1: Int) in ServiceImp1() as Service }
-    container.register { (a1: String) in ServiceImp2() as Service }
-    
-    //when
-    let service1 = container.resolve(arg1) as Service
-    let service2 = container.resolve(arg2) as Service
-    
-    //then
-    XCTAssertTrue(service1 is ServiceImp1)
-    XCTAssertTrue(service2 is ServiceImp2)
-  }
-  
-  func testThatItRegistersDifferentFactoriesForDifferentOrderOfArguments() {
-    //given
-    let arg1 = 1, arg2 = "string"
-    container.register { (a1: Int, a2: String) in ServiceImp1() as Service }
-    container.register { (a1: String, a2: Int) in ServiceImp2() as Service }
-    
-    //when
-    let service1 = container.resolve(arg1, arg2) as Service
-    let service2 = container.resolve(arg2, arg1) as Service
-    
-    //then
-    XCTAssertTrue(service1 is ServiceImp1)
-    XCTAssertTrue(service2 is ServiceImp2)
-  }
-  
-  func testThatNewRegistrationWithSameArgumentsOverridesPreviousRegistration() {
-    //given
-    let arg1 = 1, arg2 = 2
-    container.register { (a1: Int, a2: Int) in ServiceImp1() as Service }
-    let service1 = container.resolve(arg1, arg2) as Service
-    
-    //when
-    container.register { (a1: Int, a2: Int) in ServiceImp2() as Service }
-    let service2 = container.resolve(arg1, arg2) as Service
-    
-    //then
-    XCTAssertTrue(service1 is ServiceImp1)
-    XCTAssertTrue(service2 is ServiceImp2)
-  }
-  
-  func testThatDifferentFactoriesRegisteredIfArgumentIsOptional() {
-    //given
-    let name1 = "1", name2 = "2", name3 = "3"
-    container.register { (port: Int, url: NSURL) in ServiceImp3(name: name1, baseURL: url, port: port) as Service }
-    container.register { (port: Int, url: NSURL?) in ServiceImp3(name: name2, baseURL: url!, port: port) as Service }
-    container.register { (port: Int, url: NSURL!) in ServiceImp3(name: name3, baseURL: url, port: port) as Service }
-    
-    //when
-    let url: NSURL = NSURL(string: "http://example.com")!
-    let service1 = container.resolve(80, url) as Service
-    let service2 = container.resolve(80, NSURL(string: "http://example.com")) as Service
-    
-    let service3 = container.resolve(80, NSURL(string: "http://example.com")! as NSURL!) as Service
-    let service4 = container.resolve(80, NSURL(string: "http://example.com")!) as Service
-    
-    //then
-    XCTAssertEqual(service1.getServiceName(), name1)
-    XCTAssertEqual(service2.getServiceName(), name2)
-    XCTAssertEqual(service3.getServiceName(), name3)
-    XCTAssertEqual(service4.getServiceName(), name1) //implicitly unwrapped optional parameter is the same as not optional parameter
-  }
-  
-}

Dip/DipTests/TypeForwardingTests.swift

@@ -0,0 +1,252 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+@testable import Dip
+
+private protocol Service: class { }
+private protocol ForwardedType: class { }
+private class ServiceImp1: NSObject, Service, ForwardedType { }
+private class ServiceImp2: NSObject, Service, ForwardedType { }
+
+class TypeForwardingTests: XCTestCase {
+  
+  let container = DependencyContainer()
+
+  #if os(Linux)
+  static var allTests: [(String, TypeForwardingTests -> () throws -> Void)] {
+    return [
+      ("testThatItResolvesInstanceByTypeForwarding", testThatItResolvesInstanceByTypeForwarding),
+      ("testThatItReusesInstanceResolvedByTypeForwarding", testThatItReusesInstanceResolvedByTypeForwarding),
+      ("testThatItDoesNotResolveByTypeForwardingIfRegisteredForAnotherTag", testThatItDoesNotResolveByTypeForwardingIfRegisteredForAnotherTag),
+      ("testThatItDoesNotReuseInstanceResolvedByTypeForwardingRegisteredForAnotherTag",  testThatItDoesNotReuseInstanceResolvedByTypeForwardingRegisteredForAnotherTag),
+      ("testThatItCallsResolvedDependenciesBlockWhenResolvingByTypeForwarding", testThatItCallsResolvedDependenciesBlockWhenResolvingByTypeForwarding),
+      ("testThatItFallbackToDefinitionWithNoTagWhenResolvingInstanceByTypeForwarding", testThatItFallbackToDefinitionWithNoTagWhenResolvingInstanceByTypeForwarding),
+      ("testThatItThrowsErrorWhenResolvingNotImplementedTypeWithTypeForwarding", testThatItThrowsErrorWhenResolvingNotImplementedTypeWithTypeForwarding),
+      ("testThatItOverridesIfSeveralDefinitionsWithTheSameTagForwardTheSameType", testThatItOverridesIfSeveralDefinitionsWithTheSameTagForwardTheSameType)
+    ]
+  }
+  
+  func setUp() {
+    container.reset()
+  }
+  #else
+  override func setUp() {
+    container.reset()
+  }
+  #endif
+
+  func testThatItResolvesInstanceByTypeForwarding() {
+    //given
+    let def = container.register { ServiceImp1() as Service }
+    container.register(def, type: ForwardedType.self)
+    container.register(def, type: NSObject.self)
+    
+    //when
+    let anotherService = try! container.resolve() as ForwardedType
+    let anyOtherService = try! container.resolve(ForwardedType.self)
+    let object = try! container.resolve() as NSObject
+    let anyObject = try! container.resolve(NSObject.self)
+    
+    //then
+    XCTAssertTrue(anotherService is ServiceImp1)
+    XCTAssertTrue(object is ServiceImp1)
+    XCTAssertTrue(anyOtherService is ServiceImp1)
+    XCTAssertTrue(anyObject is ServiceImp1)
+  }
+  
+  func testThatItReusesInstanceResolvedByTypeForwarding() {
+    //given
+    let def = container.register(.ObjectGraph) { ServiceImp1() as Service }
+      .resolveDependencies { container, resolved in
+        //when
+        let forwardType = try container.resolve() as ForwardedType
+        let anyForwardType = try container.resolve(ForwardedType.self) as! ForwardedType
+        let object = try container.resolve() as NSObject
+        let anyObject = try container.resolve(NSObject.self) as! NSObject
+        let service = try container.resolve() as Service
+        let anyService = try container.resolve(Service.self) as! Service
+
+        //then
+        XCTAssertTrue(forwardType === resolved as! ForwardedType)
+        XCTAssertTrue(anyForwardType === resolved as! ForwardedType)
+        XCTAssertTrue(object === resolved as! NSObject)
+        XCTAssertTrue(anyObject === resolved as! NSObject)
+        XCTAssertTrue(service === resolved)
+        XCTAssertTrue(anyService === resolved)
+    }
+    container.register(def, type: ForwardedType.self)
+    container.register(def, type: NSObject.self)
+    
+    let _ = try! container.resolve() as Service
+    let _ = try! container.resolve() as ForwardedType
+    let _ = try! container.resolve() as NSObject
+  }
+  
+  func testThatItDoesNotResolveByTypeForwardingIfRegisteredForAnotherTag() {
+    //given
+    let def = container.register(tag: "tag") { ServiceImp1() as Service }
+    container.register(def, type: ForwardedType.self, tag: "otherTag")
+    
+    //then
+    AssertThrows(expression: try container.resolve(tag: "tag") as ForwardedType)
+    AssertThrows(expression: try container.resolve(ForwardedType.self, tag: "tag"))
+    
+    //and given
+    container.register(def, type: ForwardedType.self, tag: "tag")
+    
+    //then
+    AssertNoThrow(expression: try container.resolve(tag: "tag") as ForwardedType)
+    AssertNoThrow(expression: try container.resolve(ForwardedType.self, tag: "tag"))
+  }
+  
+  func testThatItDoesNotReuseInstanceResolvedByTypeForwardingRegisteredForAnotherTag() {
+    var resolveDependenciesCalled = false
+    //given
+    let def = container.register(.ObjectGraph) { ServiceImp1() as Service }
+      .resolveDependencies { container, service in
+        guard resolveDependenciesCalled == false else { return }
+        resolveDependenciesCalled = true
+
+        let forwardType = try container.resolve(tag: "tag") as ForwardedType
+        let anyForwardType = try container.resolve(ForwardedType.self, tag: "tag") as! ForwardedType
+
+        let object = try container.resolve() as NSObject
+        let anyObject = try container.resolve(NSObject.self) as! NSObject
+        
+        //then
+        XCTAssertFalse(forwardType === service as! ForwardedType)
+        XCTAssertFalse(anyForwardType === service as! ForwardedType)
+        XCTAssertTrue(object === service as! NSObject)
+        XCTAssertTrue(anyObject === service as! NSObject)
+    }
+    container.register(def, type: ForwardedType.self, tag: "tag")
+    container.register(def, type: NSObject.self)
+    
+    //when
+    let _ = try! container.resolve() as Service
+  }
+  
+  func testThatItCallsResolvedDependenciesBlockWhenResolvingByTypeForwarding() {
+    //given
+    var originalResolveDependenciesCalled = false
+    var resolveDependenciesCalled = false
+    let def = container.register { ServiceImp1() }
+      .resolveDependencies { container, service in
+        originalResolveDependenciesCalled = true
+    }
+    
+    container.register(def, type: Service.self)
+      .resolveDependencies { container, object in
+        resolveDependenciesCalled = true
+    }
+    
+    //when
+    let _ = try! container.resolve() as Service
+    
+    //then
+    XCTAssertTrue(resolveDependenciesCalled)
+    XCTAssertTrue(originalResolveDependenciesCalled)
+
+    //and when
+    resolveDependenciesCalled = false
+    originalResolveDependenciesCalled = false
+    let _ = try! container.resolve(Service.self)
+    
+    //then
+    XCTAssertTrue(resolveDependenciesCalled)
+    XCTAssertTrue(originalResolveDependenciesCalled)
+  }
+  
+  func testThatItFallbackToDefinitionWithNoTagWhenResolvingInstanceByTypeForwarding() {
+    let def = container.register { ServiceImp1() as Service }
+    container.register { ServiceImp2() as Service }
+    container.register(def, type: NSObject.self)
+    
+    //when
+    let service = try! container.resolve(tag: "tag") as NSObject
+    let anyService = try! container.resolve(NSObject.self, tag: "tag")
+    
+    //then
+    XCTAssertTrue(service is ServiceImp1)
+    XCTAssertTrue(anyService is ServiceImp1)
+  }
+  
+  func testThatItFirstUsesTaggedDefinitionWhenResolvingOptional() {
+    let expectedTag: DependencyContainer.Tag = .String("tag")
+    container.register(tag: expectedTag) { ServiceImp1() as Service }
+      .resolveDependencies { container, resolved in
+        XCTAssertEqual(container.context.tag, expectedTag)
+    }
+    container.register { ServiceImp2() as Service }
+    
+    //when
+    let service = try! container.resolve(tag: "tag") as Service?
+    let anyService = try! container.resolve((Service?).self, tag: "tag")
+    
+    //then
+    XCTAssertTrue(service is ServiceImp1)
+    XCTAssertTrue(anyService is ServiceImp1)
+  }
+  
+  func testThatItThrowsErrorWhenResolvingNotImplementedTypeWithTypeForwarding() {
+    //given
+    let def = container.register { ServiceImp1() as Service }
+    container.register(def, type: NSCoder.self)
+    
+    //then
+    AssertThrows(expression: try container.resolve() as NSCoder)
+    AssertThrows(expression: try container.resolve(NSCoder.self))
+  }
+  
+  func testThatItOverridesIfSeveralDefinitionsWithTheSameTagForwardTheSameType() {
+    let def1 = container.register { ServiceImp1() as Service }
+    let def2 = container.register { ServiceImp2() as Service }
+    container.register(def1, type: NSObject.self)
+
+    XCTAssertTrue(try! container.resolve() as NSObject is ServiceImp1)
+    XCTAssertTrue(try! container.resolve(NSObject.self) is ServiceImp1)
+
+    //when
+    container.register(def2, type: NSObject.self)
+    
+    //then
+    XCTAssertTrue(try! container.resolve() as NSObject is ServiceImp2)
+    XCTAssertTrue(try! container.resolve(NSObject.self) is ServiceImp2)
+    
+    //and given
+    container.register(def2, type: NSObject.self, tag: "tag")
+
+    XCTAssertTrue(try! container.resolve(tag: "tag") as NSObject is ServiceImp2)
+    XCTAssertTrue(try! container.resolve(NSObject.self, tag: "tag") is ServiceImp2)
+
+    //when
+    container.register(def1, type: NSObject.self, tag: "tag")
+    
+    //then
+    XCTAssertTrue(try! container.resolve(tag: "tag") as NSObject is ServiceImp1)
+    XCTAssertTrue(try! container.resolve(NSObject.self, tag: "tag") is ServiceImp1)
+  }
+  
+}

DipPlayground.playground/Pages/Auto-injection.xcplaygroundpage/Contents.swift

@@ -0,0 +1,213 @@
+//: [Previous: Shared Instances](@previous)
+
+import UIKit
+import Dip
+
+let container = DependencyContainer()
+/*:
+
+### Auto-Injection
+
+On the previous page you saw how auto-wiring helps us get rid of boilerplate code when registering and resolving components with consturctor injection. Auto-injection solves the same problem for property injection.
+
+Let's say you have following related components:
+*/
+
+protocol Service: class {
+    var logger: Logger? { get }
+    var tracker: Tracker? { get }
+}
+
+class ServiceImp: Service {
+    var logger: Logger?
+    var tracker: Tracker?
+}
+
+/*:
+When you register them in a container you will end up with something like this:
+*/
+
+container.register() { TrackerImp() as Tracker }
+container.register() { LoggerImp() as Logger }
+
+container.register() { ServiceImp() as Service }
+    .resolveDependencies { container, service in
+        let service = service as! ServiceImp
+        service.logger = try container.resolve() as Logger
+        service.tracker = try container.resolve() as Tracker
+}
+
+let service = try! container.resolve() as Service
+service.logger
+service.tracker
+
+/*:
+Notice that the same boilerplate code that we saw in constructor injection now moved to `resolveDepedencies` block.
+With auto-injection your code transforms to this:
+*/
+
+class AutoInjectedServiceImp: Service {
+    private var injectedLogger = Injected<Logger>()
+    var logger: Logger? { return injectedLogger.value }
+    
+    private var injectedTracker = Injected<Tracker>()
+    var tracker: Tracker? { return injectedTracker.value }
+}
+
+container.register() { AutoInjectedServiceImp() as Service }
+
+let autoInjectedService = try! container.resolve() as Service
+autoInjectedService.logger
+autoInjectedService.tracker
+
+/*:
+As you can see we added two private properties to our implementation of `Service` - `injectedLogger` and `injectedTracker`. Their types are `Injeceted<Logger>` and `Injected<Tracker>` respectively. Note that we've not just defined them as properties of those types, but defined them with some initial value. `Injected<T>` is a simple _wrapper class_ that wraps value of generic type and provides read-write access to it with `value` property. This property is defined as optional, so that when we create instance of `Injected<T>` it will have `nil` in its value. There is also another wrapper - `InjectedWeak<T>` - which in contrast to `Injected<T>` holds a week reference to its wrapped object, thus requiring it to be a _reference type_ (or `AnyObject`), when `Injected<T>` can also wrap value types (or `Any`).
+
+What is happening under the hood is that after concrete instance of resolved type is created (`Service` in that case), container will iterate through its properties using `Mirror`. For each of the properties wrapped with `Injected<T>` or `InjectedWeak<T>` it will search a definition that can be used to create an instance of wrapped type and use it to create and inject a concrete instance in a `value` property of a wrapper. The fact that wrappers are _classes_ or _reference types_ makes it possible at runtime to inject dependency in instance of resolved type.
+
+The requirement for auto-injection is that types injected types should be registered in a container and should use factories with no runtime arguments.
+
+Auto-injected properties can be marked with tag. Then container will search for definition tagged by the same tag to resolve this property.
+
+You can provide closure that will be called when the dependency will be injected in the property. It is similar to `didSet` property observer.
+
+Auto-injected properties are required by default. That means that if container fails to resolve any of auto-injected properties of the instance (or any of its dependencies) it will fail resolution of the object graph in whole.
+*/
+
+class ServerWithRequiredClient {
+    var client = Injected<Client>()
+}
+
+container.register { ServerWithRequiredClient() }
+
+do {
+    let serverWithClient = try container.resolve() as ServerWithRequiredClient
+}
+catch {
+    print(error)
+}
+
+/*:
+You can make auto-injected property optional by passing `false` to `required` parameter of `Injected<T>`/`InjectedWeak<T>` constructor. For such properties container will ignore any errors when it resolves this property (or any of its dependencies).
+*/
+
+class ServerWithOptionalClient {
+    var optionalClient = Injected<Client>(required: false)
+}
+
+container.register { ServerWithOptionalClient() }
+let serverWithNoClient = try! container.resolve() as ServerWithOptionalClient
+serverWithNoClient.optionalClient.value
+
+/*:
+Another example of using auto-injection is circular dependencies. Let's say you have a `Server` and a `ServerClient` both referencing each other.
+*/
+
+protocol Server: class {
+    weak var client: ServerClient? { get }
+}
+
+protocol ServerClient: class {
+    var server: Server? { get }
+}
+
+class ServerImp: Server {
+    weak var client: ServerClient?
+}
+
+class ServerClientImp: ServerClient {
+    var server: Server?
+    
+    init(server: Server) {
+        self.server = server
+    }
+}
+
+/*:
+The standard way to register such components in `DependencyContainer` will lead to such code:
+*/
+
+container.register(.ObjectGraph) {
+    ServerClientImp(server: try container.resolve()) as ServerClient
+}
+
+container.register(.ObjectGraph) { ServerImp() as Server }
+    .resolveDependencies { (container: DependencyContainer, server: Server) in
+        (server as! ServerImp).client = try container.resolve() as ServerClient
+}
+
+let client = try! container.resolve() as ServerClient
+client.server
+
+/*:
+With auto-injection you will have the following code:
+*/
+
+class InjectedServerImp: Server {
+    private var injectedClient = InjectedWeak<ServerClient>()
+    var client: ServerClient? { return injectedClient.value }
+}
+
+class InjectedClientImp: ServerClient {
+    private var injectedServer = Injected<Server>()
+    var server: Server? { get { return injectedServer.value } }
+}
+
+container.register(.ObjectGraph) { InjectedServerImp() as Server }
+container.register(.ObjectGraph) { InjectedClientImp() as ServerClient }
+
+let injectedClient = try! container.resolve() as ServerClient
+injectedClient.server
+injectedClient.server?.client === injectedClient //circular dependencies were resolved correctly
+
+/*:
+You can see that component registration looks much simpler now. But on the other side it requires some boilerplate code in implementations, and also tightly coupls your code with Dip.
+
+Here is an example with higher number of dependencies.
+*/
+container.register() { RouterImp() as Router }
+container.register() { DataProviderImp() as DataProvider }
+
+class ViewController: UIViewController {
+    var logger: Logger?
+    var tracker: Tracker?
+    var dataProvider: DataProvider?
+    var router: Router?
+}
+
+container.register { ViewController() }
+    .resolveDependencies { container, controller in
+        controller.logger = try container.resolve() as Logger
+        controller.tracker = try container.resolve() as Tracker
+        controller.dataProvider = try container.resolve() as DataProvider
+        controller.router = try container.resolve() as Router
+}
+
+let viewController = try! container.resolve() as ViewController
+viewController.router
+
+/*:
+With auto-injection you can replace that with something like this:
+*/
+
+class AutoInjectedViewController: UIViewController {
+    let logger = Injected<Logger>()
+    let tracker = Injected<Tracker>()
+    let dataProvider = Injected<DataProvider>()
+    let router = Injected<Router>()
+}
+
+container.register { AutoInjectedViewController() }
+
+let autoViewController = try! container.resolve() as AutoInjectedViewController
+autoViewController.router.value
+
+/*:
+In such scenario when view controller is created by storyboard you will need to use property injection anyway, so the overhead of adding additional properties for auto-injection is smaller. Also all the boilerplate code of unwrapping injected properties (if you need that) can be moved to extension, cleaning implementation a bit.
+
+> **Note**: For such cases concider using [DipUI](https://github.com/AliSoftware/Dip-UI). It is a small extension for Dip that allows you to do exactly what we need in this example - inject dependencies in instances created by storyboards. It does not require to use auto-injection feature but plays nice with it.
+
+So as you can see there are certain advantages and disadvatages of using auto-injection. It makes your definitions simpler, especially if there are circular dependencies involved or the number of dependencies is high, removing boilerplate calls to `resolve` method in `resolveDependencies` block of your definitions. But it requires additional properties and some boilerplate code in your implementations, makes your implementatios tightly coupled with Dip. You can avoid tight coupoling by using your own boxing classes instead of `Injected<T>` and `InjectedWeak<T>` (see `AutoInjectedPropertyBox`).
+*/
+
+//: [Next: Type Forwarding](@next)

DipPlayground.playground/Pages/Auto-wiring.xcplaygroundpage/Contents.swift

@@ -0,0 +1,117 @@
+//: [Previous: Shared Instances](@previous)
+
+import Dip
+import UIKit
+
+/*:
+
+### Auto-wiring
+
+Among three main DI patterns - _constructor_, _property_ and _method_ injection - construction injection should be your choise by default. Dip makes use of this pattern very simple. 
+
+Let's say you have some VIPER module with following components:
+*/
+protocol Service {}
+protocol Interactor {
+    var service: Service { get }
+}
+protocol Router {}
+protocol ViewOutput {}
+protocol Presenter {
+    var router: Router { get }
+    var interactor: Interactor { get }
+    var view: ViewOutput { get }
+}
+
+class RouterImp: Router {}
+class View: UIView, ViewOutput {}
+class ServiceImp: Service {}
+
+/*:
+VIPER module by its nature consists of a lot of components, wired up using protocols. Using construction injection you can end up with following constructors for presenter and interactor:
+*/
+
+class InteractorImp: Interactor {
+    var service: Service
+    
+    init(service: Service) {
+        self.service = service
+    }
+}
+
+class PresenterImp: Presenter {
+    let router: Router
+    let interactor: Interactor
+    let view: ViewOutput
+    
+    init(view: ViewOutput, interactor: Interactor, router: Router) {
+        self.view = view
+        self.interactor = interactor
+        self.router = router
+    }
+}
+
+/*:
+If you register these components in a container you will end up with rather boilerplate code:
+*/
+
+let container = DependencyContainer()
+container.register { ServiceImp() as Service }
+container.register { RouterImp() as Router }
+container.register { View() as ViewOutput }
+
+container.register { try InteractorImp(service: container.resolve()) as Interactor }
+container.register {
+    try PresenterImp(
+        view: container.resolve(),
+        interactor: container.resolve(),
+        router: container.resolve()) as Presenter
+}
+
+
+var presenter = try! container.resolve() as Presenter
+presenter.interactor.service
+
+/*:
+While definition for `Interactor` looks fine, `Presenter`'s definition is overloaded with the same `resolve` calls to container.
+
+The other option you have is to register factory with runtime arguments:
+*/
+
+container.register { InteractorImp(service: $0) as Interactor }
+container.register { PresenterImp(view: $0, interactor: $1, router: $2) as Presenter }
+
+/*: 
+But then to resolve presenter or interactor you will first need to resolve their dependencies and pass them as arguments to `resolve` method:
+*/
+
+let service = try! container.resolve() as Service
+let interactor = try! container.resolve(withArguments: service) as Interactor
+let view = try! container.resolve() as ViewOutput
+let router = try! container.resolve() as Router
+presenter = try! container.resolve(withArguments: view, interactor, router) as Presenter
+presenter.interactor.service
+
+/*:
+Again to much of boilerplate code. Also it's easy to make a mistake in the order of arguments.
+
+Auto-wiring solves this problem by combining these two approaches - you register factories with runtime arguments, but resolve components with just a call to `resolve()`. Container will resolve all consturctor arguments for you.
+*/
+
+container.register { InteractorImp(service: $0) as Interactor }
+container.register { PresenterImp(view: $0, interactor: $1, router: $2) as Presenter }
+
+presenter = try! container.resolve() as Presenter
+presenter.interactor.service
+
+/*:
+You don't need to call `resolve` in a factory and care about order of arguments any more.
+
+The only requirement is that all constructor arguments should be registered in the container and there should be no several factories with the same _number_ of arguments registered for the same components. 
+
+In very rare case when you have several different factories with different set of runtime arguments registered for the same component, when you try to resolve it container will try to use these factories one by one until one of them succeeds starting with a factory with most numbers of arguments. If it finds two factories with the same number of arguments it will throw an error.
+
+You can use auto-wiring with tags. The tag that you pass to `resolve` method will be used to resolve each of the constructor arguments.
+*/
+
+//: [Next: Auto-injection](@next)

DipPlayground.playground/Pages/Circular dependencies.xcplaygroundpage/Contents.swift

@@ -0,0 +1,106 @@
+//: [Previous: Scopes](@previous)
+
+import Dip
+
+let container = DependencyContainer()
+
+/*:
+### Circular Dependencies
+
+Very often we encounter situations when we have circular dependencies between components. The most obvious example is delegation pattern. Dip can resolve such dependencies easily.
+
+Let's say you have some network client and it's delegate defined like this:
+*/
+
+protocol NetworkClientDelegate: class {
+    var networkClient: NetworkClient { get }
+}
+
+protocol NetworkClient: class {
+    weak var delegate: NetworkClientDelegate? { get set }
+}
+
+class NetworkClientImp: NetworkClient {
+    weak var delegate: NetworkClientDelegate?
+    init() {}
+}
+
+class Interactor: NetworkClientDelegate {
+    let networkClient: NetworkClient
+    init(networkClient: NetworkClient) {
+        self.networkClient = networkClient
+    }
+}
+
+/*:
+Note that:
+
+ - one of this classes uses _property injection_ (`NetworkClientImp`) — you'll give the `delegate` value via its property directly, _after_ initialization
+ - and another uses _constructor injection_ (`Interactor`) — you'll need to give the `networkclient` value via the constructor, _during_ initialization.
+
+It's very important that _at least one_ of them uses property injection, because if you try to use constructor injection for both of them then you will enter infinite loop when you will call `resolve`.
+
+Now you can register those classes in container:
+*/
+
+container.register(.ObjectGraph) {
+    Interactor(networkClient: try container.resolve()) as NetworkClientDelegate
+}
+
+container.register(.ObjectGraph) { NetworkClientImp() as NetworkClient }
+    .resolveDependencies { (container, client) -> () in
+        client.delegate = try container.resolve() as NetworkClientDelegate
+}
+
+/*:
+Here you can spot the difference in the way we register classes.
+
+ - `Interactor` class uses constructor injection, so to register it we use the block factory where we call `resolve` to obtain instance of `NetworkClient` and pass it to constructor.
+ - `NetworkClientImp` uses property injection for it's delegate property. Again we use block factory to create instance, but to inject the delegate property we use the special `resolveDependencies` method. Block passed to this method will be called right _after_ the block factory. So you can use this block to perform additional setup or, like in this example, to resolve circular dependencies.
+
+This way `DependencyContainer` breaks infinite recursion that would happen if we used constructor injection for both of our components.
+
+*Note*: You can use container reference inside instance factory without using capture list, there will be [no retain cycle](https://github.com/AliSoftware/Dip/issues/23)
+
+
+Now when you resolve `NetworkClientDelegate` you will get an instance of `Interactor` that will have client with delegate referencing the same `Interactor` instance:
+*/
+
+let interactor = try! container.resolve() as NetworkClientDelegate
+interactor.networkClient.delegate === interactor // true: they are the same instances
+
+/*:
+**Warning**: Note that one of the properties (`delegate`) is defined as _weak_. That's crucial to avoid retain cycle. But now if you try to resolve `NetworkClient` first it's delegate will be released before `resolve` returns, bcause no one holds a reference to it except the container.
+*/
+
+let networkClient = try! container.resolve() as NetworkClient
+networkClient.delegate // delegate was alread released =(
+
+/*:
+Note also that we used `.ObjectGraph` scope to register implementations. This is also very important to preserve consistency of objects relationships.
+
+If we would have used `.Prototype` scope for both components then container would not reuse instances and we would have an infinite loop:
+
+ - Each attempt to resolve `NetworkClientDelegate` will create new instance of `Interactor`.
+ - It will resolve `NetworkClient` which will create new instance of `NetworkClientImp`.
+ - It will try to resolve it's delegate property and that will create new instance of `Interactor`
+ - … And so on and so on.
+
+If we would have used `.Prototype` for one of the components it will lead to the same infinite loop or one of the relationships will be invalid:
+*/
+
+container.reset()
+
+container.register(.Prototype) {
+    Interactor(networkClient: try container.resolve()) as NetworkClientDelegate
+}
+
+container.register(.ObjectGraph) { NetworkClientImp() as NetworkClient }
+    .resolveDependencies { (container, client) -> () in
+        client.delegate = try container.resolve() as NetworkClientDelegate
+}
+
+let invalidInteractor = try! container.resolve() as NetworkClientDelegate
+invalidInteractor.networkClient.delegate // that is not valid
+
+//: [Next: Shared Instances](@next)

DipPlayground.playground/Pages/Creating container.xcplaygroundpage/Contents.swift

@@ -29,7 +29,7 @@ Both syntaxes are equivalent. The one using the configuration block is simply a
 
 ### When/where to create container?
 
-While there is an option to use container as a global variable we advise instead to create and configure container in your app delegate and pass it between your objects.
+While there is an option to use container as a global variable we advise instead to create and configure container in your app delegate and pass it between your objects (see [Shared Instances](Shared%20Instances)).
 
 */
 //: [Next: Registering Components](@next)

DipPlayground.playground/Pages/Registering components.xcplaygroundpage/Contents.swift

@@ -31,14 +31,28 @@ container.register(factory: factory.someService)
 
 /*:
 Optionally you can associate definitions with Integer or String tags. This way you can register different implementations for the same protocol.  
-You can use String or Integer literals, or the `DependencyContainer.Tag` enum.
+You can use `DependencyContainer.Tag` enum, String or Integer literals, or instances of types that conform to `DependencyTagConvertible` protocol.
 */
 
 container.register(tag: "tag") { ServiceImp1() as Service }
-container.register(tag: DependencyContainer.Tag.Int(0)) { ServiceImp1() as Service }
+container.register(tag: 0) { ServiceImp1() as Service }
+
+enum MyCustomTag: String, DependencyTagConvertible {
+    case SomeTag
+}
+
+container.register(tag: MyCustomTag.SomeTag) { ServiceImp1() as Service }
 
 /*:
 We recommand you to use constants for the tags, to make the intent clear and avoid magic numbers and typos.
+
+You can remove all registered definitions or register and remove them one by one:
 */
 
+let serviceDefinition = container.register { ServiceImp1() as Service }
+container
+container.remove(serviceDefinition)
+
+container.reset()
+
 //: [Next: Resolving Components](@next)

DipPlayground.playground/Pages/Resolving components.xcplaygroundpage/Contents.swift

@@ -12,7 +12,7 @@ let container = DependencyContainer { container in
 You resolve previously registered definition using `resolve` method:
 */
 
-var service = container.resolve() as Service
+var service = try! container.resolve() as Service
 
 /*:
 That code says that you want your `container` to give you an instance that was registered as implementation of `Service` protocol.
@@ -20,7 +20,7 @@ That code says that you want your `container` to give you an instance that was r
 It's important to specify the same type that you used for registration. You can use either `as` syntax, or specify type of you variable when you define it:
 */
 
-let otherService: Service = container.resolve()
+let otherService: Service = try! container.resolve()
 
 /*:
 Both ways will let the `container` detect the type that you want to resolve as. We prefer the `as` syntax because it reads more naturally in Swift.
@@ -32,16 +32,16 @@ container.register(tag: "production") { ServiceImp1() as Service }
 container.register(tag: "test") { ServiceImp2() as Service }
 
 // Will give you a ServiceImp1 instance
-let productionService = container.resolve(tag: "production") as Service
+let productionService = try! container.resolve(tag: "production") as Service
 // Will give you a ServiceImp2 instance
-let testService = container.resolve(tag: "test") as Service
+let testService = try! container.resolve(tag: "test") as Service
 // Will give you a ServiceImp1 because one was registered without a tag on line 4
-let defaultService = container.resolve() as Service
+let defaultService = try! container.resolve() as Service
 
 /*:
 You can use runtime arguments to resolve components. Dip supports up to six arguments. For more details see ["Runtime arguments"](Runtime%20arguments).
 */
 container.register { service in ClientImp1(service: service) as Client }
-let client = container.resolve(service) as Client
+let client = try! container.resolve(withArguments: service) as Client
 
 //: [Next: Runtime Arguments](@next)

DipPlayground.playground/Pages/Runtime arguments.xcplaygroundpage/Contents.swift

@@ -12,21 +12,21 @@ Dip lets you use runtime arguments to register and resolve your components.
 Note that __types__, __number__ and __order__ of arguments matters and you can register different factories with different set of runtime arguments for the same protocol. To resolve using one of this factory you will need to pass runtime arguments of the same types, number and in the same order to `resolve` as you used in `register` method.
 */
 
-container.register { (url: NSURL, port: Int) in ServiceImp3(name: "1", baseURL: url, port: port) as Service }
-container.register { (port: Int, url: NSURL) in ServiceImp3(name: "2", baseURL: url, port: port) as Service }
-container.register { (port: Int, url: NSURL?) in ServiceImp3(name: "3", baseURL: url!, port: port) as Service }
-container.register { (port: Int, url: NSURL!) in ServiceImp3(name: "4", baseURL: url, port: port) as Service }
+container.register { (url: NSURL, port: Int) in ServiceImp4(name: "1", baseURL: url, port: port) as Service }
+container.register { (port: Int, url: NSURL) in ServiceImp4(name: "2", baseURL: url, port: port) as Service }
+container.register { (port: Int, url: NSURL?) in ServiceImp4(name: "3", baseURL: url!, port: port) as Service }
+container.register { (port: Int, url: NSURL!) in ServiceImp4(name: "4", baseURL: url, port: port) as Service }
 
 let url: NSURL = NSURL(string: "http://example.com")!
-let service1 = container.resolve(url, 80) as Service
-let service2 = container.resolve(80, url) as Service
-let service3 = container.resolve(80, NSURL(string: "http://example.com")) as Service
-let service4 = container.resolve(80, NSURL(string: "http://example.com")! as NSURL!) as Service
+let service1 = try! container.resolve(withArguments: url, 80) as Service
+let service2 = try! container.resolve(withArguments: 80, url) as Service
+let service3 = try! container.resolve(withArguments: 80, NSURL(string: "http://example.com")) as Service
+let service4 = try! container.resolve(withArguments: 80, NSURL(string: "http://example.com")! as NSURL!) as Service
 
-(service1 as! ServiceImp3).name
-(service2 as! ServiceImp3).name
-(service3 as! ServiceImp3).name
-(service4 as! ServiceImp3).name
+(service1 as! ServiceImp4).name
+(service2 as! ServiceImp4).name
+(service3 as! ServiceImp4).name
+(service4 as! ServiceImp4).name
 
 /*:
 Note that all of the services were resolved using different factories.
@@ -35,12 +35,13 @@ _Dip_ supports up to six runtime arguments. If that is not enougth you can exten
 */
 
 extension DependencyContainer {
-    public func register<T, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6>(tag tag: Tag? = nil, factory: (Arg1, Arg2, Arg3, Arg4, Arg5, Arg6) -> T) -> DefinitionOf<T> {
-        return register(tag: tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
+    public func register<T, A, B, C, D, E, F, G>(tag tag: DependencyTagConvertible? = nil, _ scope: ComponentScope = .Prototype, factory: (A, B, C, D, E, F, G) throws -> T) -> DefinitionOf<T, (A, B, C, D, E, F, G) throws -> T> {
+        return registerFactory(tag: tag, scope: scope, factory: factory, numberOfArguments: 7) { container, tag in try factory(container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag))
+        }
     }
     
-    public func resolve<T, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6>(tag tag: Tag? = nil, _ arg1: Arg1, _ arg2: Arg2, _ arg3: Arg3, _ arg4: Arg4, _ arg5: Arg5, _ arg6: Arg6) -> T {
-        return resolve(tag: tag) { (factory: (Arg1, Arg2, Arg3, Arg4, Arg5, Arg6) -> T) in factory(arg1, arg2, arg3, arg4, arg5, arg6) }
+    public func resolve<T, A, B, C, D, E, F, G>(tag tag: DependencyTagConvertible? = nil, _ arg1: A, _ arg2: B, _ arg3: C, _ arg4: D, _ arg5: E, _ arg6: F, _ arg7: G) throws -> T {
+        return try resolve(tag: tag) { factory in try factory(arg1, arg2, arg3, arg4, arg5, arg6, arg7) }
     }
 }
 

DipPlayground.playground/Pages/Scopes.xcplaygroundpage/Contents.swift

@@ -2,30 +2,65 @@
 
 import Dip
 
+let container = DependencyContainer()
+
 /*:
 
 ### Scopes
 
-Dip supports two different scopes of objects: _Prototype_ and _Singleton_.
+Dip supports three different scopes of objects: _Prototype_, _ObjectGraph_ and _Singleton_.
 
-* The `.Prototype` scope will make the `DependencyContainer` resolve your type as __a new instance every time__ you call `resolve`.
-* The `.Singleton` scope will make the `DependencyContainer` retain the instance once resolved the first time, and reuse it in the next calls during the container lifetime.
+* The `.Prototype` scope will make the `DependencyContainer` resolve your type as __a new instance every time__ you call `resolve`. This is the default scope.
+* The `.ObjectGraph` scope is like `.Prototype` scope, but it will make the `DependencyContainer` to reuse resolved instances during one (recursive) call to `resolve` method. When this call returns, all resolved instances will be discarded and next call to `resolve` will produce new instances. This scope should be used to resolve [circular dependencies](Circular%20dependencies).
+* The `.Singleton` scope will make the `DependencyContainer` retain the instance once resolved the first time, and reuse it in the next calls to `resolve` during the container lifetime.
+* The `.EagerSingleton` scope is the same as `.Singleton` scope but instances with this cope will be created when you call `bootstrap()` method on the container.
 
-The `.Prototype` scope is the default. To register a singleton, use `register(tag:instance:)`
+The `.Prototype` scope is the default. To set a scope you pass it as an argument to `register` method.
 */
 
-let container = DependencyContainer { container in
-    container.register(tag:"sharedService", instance: ServiceImp1() as Service)
-    container.register { ServiceImp1() as Service }
-}
+container.register { ServiceImp1() as Service }
+container.register(tag: "prototype", .Prototype) { ServiceImp1() as Service }
+container.register(tag: "object graph", .ObjectGraph) { ServiceImp2() as Service }
+container.register(tag: "shared instance", .Singleton) { ServiceImp3() as Service }
 
-let sharedService = container.resolve(tag: "sharedService") as Service
-let sameSharedService = container.resolve(tag: "sharedService") as Service
-sharedService as! ServiceImp1 === sameSharedService as! ServiceImp1
+let service = try! container.resolve() as Service
+let anotherService = try! container.resolve() as Service
+// They are different instances as the scope defaults to .Prototype
+service as! ServiceImp1 === anotherService as! ServiceImp1 // false
 
-let service = container.resolve() as Service
-let anotherService = container.resolve() as Service
-service as! ServiceImp1 === anotherService as! ServiceImp1
+let prototypeService = try! container.resolve(tag: "prototype") as Service
+let anotherPrototypeService = try! container.resolve(tag: "prototype") as Service
+// They are different instances:
+prototypeService as! ServiceImp1 === anotherPrototypeService as! ServiceImp1 // false
 
-//: [Next: Shared Instances](@next)
+let graphService = try! container.resolve(tag: "object graph") as Service
+let anotherGraphService = try! container.resolve(tag: "object graph") as Service
+// still different instances — the ObjectGraph scope only keep instances during one (recursive) resolution call,
+// so the two calls on the two lines above are different calls and use different instances
+graphService as! ServiceImp2 === anotherGraphService as! ServiceImp2 // false
+
+let sharedService = try! container.resolve(tag: "shared instance") as Service
+let sameSharedService = try! container.resolve(tag: "shared instance") as Service
+// same instances, the singleton scope keep and reuse instances during the lifetime of the container
+sharedService as! ServiceImp3 === sameSharedService as! ServiceImp3
+
+/*:
+ ### Bootstrapping
+ 
+ You can use `bootstrap()` method to fix your container setup and initialise components registered with `EagerSingleton` scope.
+ After bootstrapping if you try to add or remove any definition it will cause runtime exception. Call `boostrap` when you registered all the components, for example at the end of initialization block if you use `init(configBlock:)`.
+ */
+
+var resolvedEagerSingleton = false
+let definition = container.register(tag: "eager shared instance", .EagerSingleton) { ServiceImp1() as Service }
+    .resolveDependencies { _ in resolvedEagerSingleton = true }
+
+try! container.bootstrap()
+resolvedEagerSingleton
+
+let eagerSharedService = try! container.resolve(tag: "eager shared instance") as Service
+
+container.remove(definition)
+
+//: [Next: Circular Dependencies](@next)
 

DipPlayground.playground/Pages/Scopes.xcplaygroundpage/timeline.xctimeline

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Timeline
-   version = "3.0">
-   <TimelineItems>
-   </TimelineItems>
-</Timeline>

DipPlayground.playground/Pages/Shared Instances.xcplaygroundpage/Contents.swift

@@ -1,4 +1,4 @@
-//: [Previous: Scopes](@previous)
+//: [Previous: Circular Dependencies](@previous)
 
 import Dip
 import UIKit
@@ -20,6 +20,8 @@ Dip supports singletons, but it reduces cost of using them. Their singleton natu
 - You can easyly change concrete implementations without the rest of your system even notice that something changed.
 - Also it's easy to test - you just register another object in your tests. Even if you still want to use a singleton in your system.
 
+Those features you got when using Dip limits tight coupling in your code and gives you back your code flexibility.
+
 Probably the most common example is using a singleton in the network layer or "API client".
 */
 
@@ -43,7 +45,7 @@ Sure, this is very easy to code indeed. And nothing bad so far.
 But probably if you wrote a unit test or integration test for that code first, you would have noticed a problem earilier. How you test that code? And how you ensure that your tests are idenpendent of the API client's state from the previous test?
 Of cource you can work around all of the problems and the fact that `ApiClient` is a singleton, reset it's state somehow, or mock a class so that it will not return a singleton instance. But look - a moment before the singleton was your best friend and now you are fighting against it.
 
-Think - why do you want API client to be a singleton in a first place? To queue or throttle requests? Then do your queue or throttler a singleton, not an API client. Or is there any other reason. Most likely API client itself does not have a requirement to have only one system during the whole lifecycle of your application. Imagine that in the future we need two API Clients, because you now have to address two different servers & plaforms? Imposing that singleton restricts now your flexibility a lot.
+Think - why do you want API client to be a singleton in a first place? To queue or throttle requests? Then do your queue or throttler a singleton, not an API client. Or is there any other reason. Most likely API client itself does not have a requirement to have one and only one instance during the lifecycle of your application. Imagine that in the future we need two API Clients, because you now have to address two different servers & plaforms? Imposing that singleton restricts now your flexibility a lot.
 
 Instead, inject API client in view controller with property injection or constructor injection.
 */
@@ -110,7 +112,7 @@ class DipViewController: UIViewController {
     
     convenience init(dependencies: DependencyContainer) {
         self.init()
-        self.apiClient = dependencies.resolve() as ApiClientProtocol
+        self.apiClient = try! dependencies.resolve() as ApiClientProtocol
     }
     
     init() {
@@ -125,35 +127,14 @@ class DipViewController: UIViewController {
 var dipController = DipViewController(dependencies: container)
 
 /*:
-Of cource `DependencyContainer` should not be used as singleton too. Instead, inject it to objects that need to access it. And use a protocol for that. For example if your view controller needs to access API client, it does not need a reference to `DependencyContainer`, it only needs a reference to _something_ that can provide it an API client instance.
-*/
+Of cource `DependencyContainer` should not be a singleton too. There is just no need for that because you never should call `DependencyContainer` from inside of your components. That will make it a [service locator antipatter]((http://blog.ploeh.dk/2010/02/03/ServiceLocatorisanAnti-Pattern/)). You may only call `DependencyContainer` from the _Composition root_ - the place where all the components are configured and wired together.
 
-protocol ApiClientProvider {
-  func apiClient() -> ApiClientProtocol
-}
+Dependency Injection is a pattern (more precisely - a set of patterns) as well as a singleton. And any pattern can be abused. DI can be used in a [wrong way]((http://www.loosecouplings.com/2011/01/dependency-injection-using-di-container.html)), container can easily become a service locator. You should carefully decide when to use DI, you should not inject everything and everywhere and define a protocol for every single class you use. For every tool there is a right time and the same way as singleton can harm you the same way DI and protocols abuse can make your code unnececerry complex.
 
-extension DependencyContainer: ApiClientProvider {
-  func apiClient() -> ApiClientProtocol {
-    return self.resolve() as ApiClientProtocol
-  }
-}
-
-extension DipViewController {
-    convenience init(apiClientProvider: ApiClientProvider) {
-        self.init()
-        self.apiClient = apiClientProvider.apiClient()
-    }
-}
-
-dipController = DipViewController(apiClientProvider: container)
-
-/*:
-This way you also does not depend directly on Dip. Instead you provide a boundary between Dip — that you don't have control of — and your source code. So when something chagnes in Dip, you update only the boundary code.
-
-Dependency injection is a pattern as well as singleton. And any pattern can be abused. That's why if you adopt DI in one part of your system it does not mean that you should inject everything and everywhere. The same with using protocols instead of concrete implementations. For every tool there is a right time and the same way as singleton can harm you the same way DI and protocols abuse can make your code unnececerry complex.
+If you want to know more about Dependency Injection in general we recomend you to read ["Dependency Injection in .Net" by Mark Seemann](https://www.manning.com/books/dependency-injection-in-dot-net). Dip was inspired by implementations of IoC container for .Net platform and shares core principles described in that book.
 
 */
 
-//: [Next: Testing](@next)
+//: [Next: Auto-wiring](@next)
 
 

DipPlayground.playground/Pages/Shared Instances.xcplaygroundpage/timeline.xctimeline

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Timeline
-   version = "3.0">
-   <TimelineItems>
-   </TimelineItems>
-</Timeline>

DipPlayground.playground/Pages/Testing.xcplaygroundpage/Contents.swift

@@ -1,37 +1,49 @@
 //: [Previous: Shared Instances](@previous)
 
+//import XCTest
+import Dip
+
+let container = DependencyContainer()
 
 /*:
 
 ### Testing
+ 
+ If you use Dependency Injection patterns like contructor and property injection it will be much easier
+ to unit test your components. When it comes to integration tests you may want to mock some real services.
+ In these tests you can register mock implementation in the container and it will be injected instead of the real implementation.
 
 Dip is convenient to use for testing. Here is s simple example of how you can write tests with Dip.
 
-__Note__: That's a very simple example just to demostrate use of Dip in tests, not how you should or should not tests your code in general. 
+> That's a very simple example just to demonstrate use of Dip in tests, not how you should or should not test your code in general.
 You can learn more about testing based on state verification vs behavior verification [here](http://martinfowler.com/articles/mocksArentStubs.html).
-
+ 
+> XCTest is not supported by playgrounds so to be able to compile this page we commented out XCTest specific code.
 */
 
-protocol Service {
+protocol ServiceType {
     func doSomething()
 }
 
+class RealService: ServiceType {
+    func doSomething() {
+        //do something real
+    }
+}
+
 class Client {
-    var service: Service!
+    var service: ServiceType!
     
     func callService() {
         service.doSomething()
     }
 }
 
-import XCTest
-import Dip
-
 /*:
 Instead of the real `Service` implementation, provide a _fake_ implementation with test hooks that you need:
 */
 
-class FakeService: Service {
+class FakeService: ServiceType {
     var doSomethingCalled = false
     
     func doSomething() {
@@ -41,30 +53,60 @@ class FakeService: Service {
     init() {}
 }
 
-class MyTests: XCTestCase {
-    var container: DependencyContainer!
-    
-    override func setUp() {
-        super.setUp()
-        
 /*:
-Register fake implementation as `Service`:
+ Somewhere in your production code you register real implementations:
+ */
+func configure(container: DependencyContainer) {
+    container.register { RealService() as ServiceType }
+    container.register { Client() }
+        .resolveDependencies { container, client in
+            client.service = try container.resolve()
+    }
+}
+
+class MyTests/*: XCTestCase*/ {
+    
+    /*override*/ func setUp() {
+        //super.setUp()
+
+/*:
+ Reset container configuration to normal state:
 */
-        container = DependencyContainer { container in
-            container.register { FakeService() as Service }
-        }
+        container.reset()
+        configure(container)
     }
     
     func testThatDoSomethingIsCalled() {
-        let sut = Client()
-        sut.service = container.resolve() as Service
-
+        /*:
+         Register fake implementation as `Service`:
+         */
+        container.register { FakeService() as ServiceType }
+        
+        let sut = try! container.resolve() as Client
         sut.callService()
         
 /*:
 And finally you test it was called:
 */
-        XCTAssertTrue((sut.service as! FakeService).doSomethingCalled)
+        let service = sut.service as! FakeService
+        //XCTAssertTrue(service.doSomethingCalled)
     }
 }
 
+/*:
+ You can also validate your container configuration. You can do that either in a separate test suit or when runnging application in `DEBUG` mode.
+ 
+ During validation container will try to resolve all the definitions registered in it. If some of definitions requires runtime arguments you can provide them as arguments to `validate` method. They should exactly match types of arguments required by factories. Multiple arguments for the single factory should be grouped in a tuple. If you don't provide arguments validation will fail.
+ */
+container.register { (url: NSURL, port: Int) in ServiceImp4(name: "1", baseURL: url, port: port) as Service }
+try! container.validate((NSURL(string: "https://github.com/AliSoftware/Dip")!, 80))
+
+do {
+    try container.validate()
+}
+catch {
+    print(error)
+}
+
+
+

DipPlayground.playground/Pages/Testing.xcplaygroundpage/timeline.xctimeline

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Timeline
-   version = "3.0">
-   <TimelineItems>
-   </TimelineItems>
-</Timeline>

DipPlayground.playground/Pages/Type Forwarding.xcplaygroundpage/Contents.swift

@@ -0,0 +1,109 @@
+//: [Previous: Auto-injection](@previous)
+
+import Foundation
+import Dip
+
+let container = DependencyContainer()
+
+/*:
+### Type Forwarding
+ 
+Very often we end up with single class that implements several protocols. This is normal even in [VIPER architecture](https://github.com/mutualmobile/VIPER-SWIFT/blob/master/VIPER-SWIFT/Classes/Modules/List/User%20Interface/Presenter/ListPresenter.swift#L12) that constantly strives for Single Responsibility Principle.
+ 
+ Let's look at example of VIPER architecture:
+ */
+
+extension ListPresenter: ListInteractorOutput, ListModuleInterface, AddModuleDelegate {}
+extension ListInteractor: ListInteractorInput {}
+extension AddPresenter: AddModuleInterface {}
+
+/*:
+ In VIPER we need to create several objects (presenters, wireframes, interactors) which should be accessed thorugh different interfaces. We need to wire them all together so that we have the same instances in place for different types.
+ 
+ - `ListInteractor` referenced by `ListPresenter` in its `listInteractor` property (via `ListInteractorInput` protocol) should hold a backward reference to the same presenter in its `output` property
+ - `ListWireframe` referenced by `ListPresenter` should also hold a backward reference to the same presenter in its `listPresenter` property
+ - `AddWireframe` should hold a reference to `AddPresenter` that should hold reference to the same `ListPresenter` in its `addModuleDelegate` property (via `AddModuleDelegate` protocol).
+ 
+ We can achieve this result by explicitly rosolving concrete types:
+ */
+
+container.register(.ObjectGraph) { ListWireframe(addWireFrame: $0, listPresenter: $1) }
+container.register(.ObjectGraph) { AddWireframe(addPresenter: $0) }
+
+var listInteractorDefinition = container.register(.ObjectGraph) { ListInteractor() }
+    .resolveDependencies { container, interactor in
+        interactor.output = try container.resolve() as ListPresenter
+}
+
+var listPresenterDefinition = container.register(.ObjectGraph) { ListPresenter() }
+    .resolveDependencies { container, presenter in
+        presenter.listInteractor = try container.resolve() as ListInteractor
+        presenter.listWireframe = try container.resolve()
+}
+
+var addPresenterDefinition = container.register(.ObjectGraph) { AddPresenter() }
+    .resolveDependencies { container, presenter in
+        presenter.addModuleDelegate = try container.resolve() as ListPresenter
+}
+
+var addPresenter = try! container.resolve() as AddPresenter
+var listPresenter = addPresenter.addModuleDelegate as! ListPresenter
+var listInteractor = listPresenter.listInteractor as! ListInteractor
+listInteractor.output === listPresenter
+var listWireframe = listPresenter.listWireframe
+listWireframe?.listPresenter === listPresenter
+
+/*:
+ Alternatively we can use type-forwarding. With type-forwarding we register definition for one (source) type and also for another (forwarded) type. When container will try to resolve forwarded type it will use the same definition as for source type, and (if registered in `ObjectGraph` scope or as a singleton) will reuse the same instance. With that you don't need to resolve concrete types in definitions:
+ */
+
+listInteractorDefinition = container.register(.ObjectGraph) { ListInteractor() }
+    .resolveDependencies { container, interactor in
+        interactor.output = try container.resolve()
+}
+
+listPresenterDefinition = container.register(.ObjectGraph) { ListPresenter() }
+    .resolveDependencies { container, presenter in
+        presenter.listInteractor = try container.resolve()
+        presenter.listWireframe = try container.resolve()
+}
+
+addPresenterDefinition = container.register(.ObjectGraph) { AddPresenter() }
+    .resolveDependencies { container, presenter in
+        presenter.addModuleDelegate = try container.resolve()
+}
+
+/*:
+ And now we register definitions for type-forwarding:
+ */
+
+container.register(listInteractorDefinition, type: ListInteractorInput.self)
+container.register(listPresenterDefinition, type: ListInteractorOutput.self)
+container.register(listPresenterDefinition, type: ListModuleInterface.self)
+container.register(listPresenterDefinition, type: AddModuleDelegate.self)
+
+addPresenter = try! container.resolve() as AddPresenter
+listPresenter = addPresenter.addModuleDelegate as! ListPresenter
+listInteractor = listPresenter.listInteractor as! ListInteractor
+listInteractor.output === listPresenter
+listWireframe = listPresenter.listWireframe
+listWireframe?.listPresenter === listPresenter
+
+/*:
+ Type forwarding will work the same way whenever your resolve dependencies with property injection using `resolveDependencies` block, or with auto-injected properties, or with constructor injection and auto-wiring.
+ 
+ Registering definition for type forwarding will effectively register another definition in the container, linked with original one. So the same overriding rool will be applied for such registrations - last wins. If you need to register different definitions for the same type you should register them with different tags.
+ 
+ You can also provide `resolveDependencies` block for forwarded definition. First container will call `resolveDependencies` block of the source definition, and then of forwarded definition:
+ */
+listInteractorDefinition
+    .resolveDependencies { container, interactor in
+        print("resolved ListInteractor")
+}
+container.register(listInteractorDefinition, type: ListInteractorInput.self)
+    .resolveDependencies { container, interactor in
+        print("resolved ListInteractorInput")
+}
+addPresenter = try! container.resolve() as AddPresenter
+
+//: [Next: Testing](@next)

DipPlayground.playground/Pages/What is Dip?.xcplaygroundpage/Contents.swift

@@ -16,6 +16,9 @@ If you follow [Protocol-Oriented programming](https://developer.apple.com/videos
 But still there should be some point in your program where concrete instances are created. The thing is that it's better to have one well defined point for that than to scatter setup logic all over the place with different factories and lazy properties. IoC containers like _Dip_ play the role of that point.
 
 The following pages in this Playground demonstrates how to use _Dip_ to adopt all those concepts in practice.
+
+If you want to know more about Dependency Injection in general we recomend you to read ["Dependency Injection in .Net" by Mark Seemann](https://www.manning.com/books/dependency-injection-in-dot-net). Dip was inspired by implementations of IoC container for .Net platform and shares core principles described in that book.
+
 */
 //: [Next: Creating a DependencyContainer](@next)
 

DipPlayground.playground/Sources/Models.swift

@@ -8,8 +8,11 @@ public class ServiceImp1: Service {
 public class ServiceImp2: Service {
   public init() {}
 }
-
 public class ServiceImp3: Service {
+    public init() {}
+}
+
+public class ServiceImp4: Service {
   
   public let name: String
   
@@ -19,7 +22,7 @@ public class ServiceImp3: Service {
   
 }
 
-public protocol Client {
+public protocol Client: class {
   var service: Service {get}
   init(service: Service)
 }
@@ -45,3 +48,63 @@ public class ServiceFactory {
   }
 }
 
+public class ClientServiceImp: Service {
+    public weak var client: Client?
+    public init() {}
+}
+
+public protocol Logger {}
+public protocol Tracker {}
+public protocol DataProvider {}
+public protocol Router {}
+
+public class LoggerImp: Logger {
+    public init() {}
+}
+
+public class TrackerImp: Tracker {
+    public init() {}
+}
+
+public class RouterImp: Router {
+    public init() {}
+}
+
+public class DataProviderImp: DataProvider {
+    public init() {}
+}
+
+public protocol ListInteractorOutput: class {}
+public protocol ListModuleInterface: class {}
+public protocol ListInteractorInput: class {}
+public class ListPresenter: NSObject {
+    public var listInteractor : ListInteractorInput?
+    public var listWireframe : ListWireframe?
+    public override init() {}
+}
+public class ListInteractor: NSObject {
+    public var output : ListInteractorOutput?
+    public override init() {}
+}
+
+public class ListWireframe : NSObject {
+    public let addWireframe: AddWireframe
+    public let listPresenter: ListPresenter
+    public init(addWireFrame: AddWireframe, listPresenter: ListPresenter) {
+        self.addWireframe = addWireFrame
+        self.listPresenter = listPresenter
+    }
+}
+
+public protocol AddModuleDelegate: class {}
+public protocol AddModuleInterface: class {}
+public class AddWireframe: NSObject {
+    let addPresenter : AddPresenter
+    public init(addPresenter: AddPresenter) {
+        self.addPresenter = addPresenter
+    }
+}
+public class AddPresenter: NSObject {
+    public var addModuleDelegate : AddModuleDelegate?
+    public override init() {}
+}

DipPlayground.playground/contents.xcplayground

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<playground version='6.0' target-platform='ios' display-mode='rendered'>
+<playground version='6.0' target-platform='ios' display-mode='raw'>
     <pages>
         <page name='What is Dip?'/>
         <page name='Creating container'/>
@@ -7,7 +7,11 @@
         <page name='Resolving components'/>
         <page name='Runtime arguments'/>
         <page name='Scopes'/>
+        <page name='Circular dependencies'/>
         <page name='Shared Instances'/>
+        <page name='Auto-wiring'/>
+        <page name='Auto-injection'/>
+        <page name='Type Forwarding'/>
         <page name='Testing'/>
     </pages>
 </playground>

Package.swift

@@ -0,0 +1,30 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import PackageDescription
+
+let package = Package(
+    name: "Dip"
+)
+

README.md

@@ -2,8 +2,11 @@
 
 [![CI Status](http://img.shields.io/travis/AliSoftware/Dip.svg?style=flat)](https://travis-ci.org/AliSoftware/Dip)
 [![Version](https://img.shields.io/cocoapods/v/Dip.svg?style=flat)](http://cocoapods.org/pods/Dip)
+[![Carthage Compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
 [![License](https://img.shields.io/cocoapods/l/Dip.svg?style=flat)](http://cocoapods.org/pods/Dip)
 [![Platform](https://img.shields.io/cocoapods/p/Dip.svg?style=flat)](http://cocoapods.org/pods/Dip)
+[![Swift Version](https://img.shields.io/badge/Linux-compatible-4BC51D.svg?style=flat)](https://developer.apple.com/swift)
+[![Swift Version](https://img.shields.io/badge/Swift-2.2-F16D39.svg?style=flat)](https://developer.apple.com/swift)
 
 ![Animated Dipping GIF](cinnamon-pretzels-caramel-dipping.gif)  
 _Photo courtesy of [www.kevinandamanda.com](http://www.kevinandamanda.com/recipes/appetizer/homemade-soft-cinnamon-sugar-pretzel-bites-with-salted-caramel-dipping-sauce.html)_
@@ -12,23 +15,129 @@ _Photo courtesy of [www.kevinandamanda.com](http://www.kevinandamanda.com/recipe
 
 `Dip` is a simple **Dependency Injection Container**.
 
-It's not true Dependency Injection, but it's damn close, and aimed to be as simple as possible.  
-It's inspired by `.NET`'s [Unity Container](https://msdn.microsoft.com/library/ff647202.aspx).
+It's aimed to be as simple as possible yet provide rich functionality usual for DI containers on other platforms. It's inspired by `.NET`'s [Unity Container](https://msdn.microsoft.com/library/ff647202.aspx) and other DI containers.
 
-* You start by creating `let dc = DependencyContainer()` and **register all your dependencies, by associating a `protocol` to an `instance` or a `factory`**.
-* Then anywhere in your application, you can call `dc.resolve()` to **resolve a `protocol` into an instance of a concrete type** using that `DependencyContainer`.
+* You start by creating `let container = DependencyContainer()` and **registering your dependencies, by associating a _protocol_ or _type_ to a `factory`**.
+* Then you can call `container.resolve()` to **resolve an instance of _protocol_ or _type_** using that `DependencyContainer`.
 
-This allows you to define the real, concrete types only in one place ([e.g. like this in your app](https://github.com/AliSoftware/Dip/blob/master/Example/DipSampleApp/DependencyContainers.swift#L22-L27), and [resetting it in your `setUp` for each Unit Tests](https://github.com/AliSoftware/Dip/blob/master/Example/Tests/SWAPIPersonProviderTests.swift#L17-L21)) and then [only work with `protocols` in your code](https://github.com/AliSoftware/Dip/blob/master/Example/DipSampleApp/Providers/SWAPIStarshipProvider.swift#L12) (which only define an API contract), without worrying about the real implementation.
+> You can easily use Dip along with Storyboards and Nibs - checkout [Dip-UI](https://github.com/AliSoftware/Dip-UI) extensions. 
 
-## Advantages of DI and loose coupling
+## Documentation & Usage Examples
 
-* Define clear API contracts before even thinking about implementation, and make your code loosly coupled with the real implementation.
-* Easily switch between implementations — as long as they respect the same API contact (the `protocol`
-* Greatly improve testability, as you can register a real instance in your app but a fake instance in your tests dedicated for testing / mocking the fonctionnality
-* Get rid of those `sharedInstances` and avoid the singleton pattern at all costs
+Dip is completely [documented](http://cocoadocs.org/docsets/Dip/4.5.0/) and comes with a Playground that lets you try all its features and become familiar with API. You can find it in `Dip.xcworkspace`.
+
+> Note: it may happen that you will need to build Dip framework before playground will be able to use it. For that select `Dip-iOS` scheme and build.
+
+You can find bunch of usage examples in a [wiki](wiki).
+
+There are also several blog posts that describe how to use Dip and some of its implementation details:
+
+- [IoC container in Swift](http://ilya.puchka.me/ioc-container-in-swift/)
+- [IoC container in Swift. Circular dependencies and auto-injection](http://ilya.puchka.me/ioc-container-in-swift-circular-dependencies-and-auto-injection/)
+- [Dependency injection with Dip](http://ilya.puchka.me/dependency-injecinjection-with-dip/)
+
+File an issue if you have any question.
+
+
+## Features
+
+- **[Scopes](wiki/scopes)**. Dip supports 4 different scopes (or life cycle strategies): _Prototype_, _ObjectGraph_, _Singleton_, _EagerSingleton_;
+- **[Named definitions](wiki/named-definitions)**. You can register different factories for the same protocol or type by registering them with [tags]();
+- **[Runtime arguments](wiki/runtime-arguments)**. You can register factories that accept up to 6 runtime arguments;
+- **[Circular dependencies](wiki/circular-dependencies)**. Dip can resolve circular dependencies;
+- **[Auto-wiring](wiki/auto-wiring)** & **[Auto-injection](wiki/auto-injection)**. Dip can infer your components' dependencies injected in constructor and automatically resolve them as well as dependencies injected with properties.
+- **[Type forwarding](wiki/Type-forwarding)**. You can register the same factory to resolve different types.
+- **[Storyboards integration](wiki/storyboards-integration)**. You can easily use Dip along with storyboards and Xibs without ever referencing container in your view controller's code;
+- **Weakly typed components**. Dip can resolve weak types when they are unknown at compile time.
+- **Easy configuration**. No complex container hierarchy, no unneeded functionality;
+- **Thread safety**. Registering and resolving components is thread safe;
+- **Helpful error messages and configuration validation**. You can validate your container configuration. If something can not be resolved at runtime Dip throws an error that completely describes the issue;
+
+## Basic usage
+
+```swift
+import Dip
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+    
+    // Create the container
+    private let container = DependencyContainer { container in
+    
+        // Register some factory. ServiceImp here implements protocol Service
+        container.register { ServiceImp() as Service }
+    }
+
+    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 
+        
+        // Resolve a concrete instance. Container will instantiate new instance of ServiceImp
+        let service = try! container.resolve() as Service
+    
+        ...
+    }
+}
+
+```
+
+## More sophisticated example
+
+```swift
+import Dip
+
+class AppDelegate: UIResponder, UIApplicationDelegate {
+	private let container = DependencyContainer.configure()
+	...
+}
+
+//CompositionRoot.swift
+import Dip
+import DipUI
+
+extension DependencyContainer {
+
+	static func configure() -> DependencyContainer {
+		return DependencyContainer { container in 
+			container.register(tag: "ViewController") { ViewController() }
+			  .resolveDependencies { container, controller in
+				  controller.animationsFactory = try container.resolve() as AnimatonsFactory
+			}
+    
+			container.register { AuthFormBehaviourImp(apiClient: $0) as AuthFormBehaviour }
+			container.register { container as AnimationsFactory }
+			container.register { view in ShakeAnimationImp(view: view) as ShakeAnimation }
+			container.register { APIClient(baseURL: NSURL(string: "http://localhost:2368")!) as ApiClient }
+		}
+	}
+
+}
+
+extension DependencyContainer: AnimationsFactory { 
+    func shakeAnimation(view: UIView) -> ShakeAnimation {
+        return try! self.resolve(withArguments: view)
+    }
+}
+
+extension ViewController: StoryboardInstantiatable {}
+
+//ViewController.swift
+
+class ViewController {
+    var animationsFactory: AnimationsFactory?
+
+    private let _formBehaviour = Injected<AuthFormBehaviour>()
+    
+    var formBehaviour: AuthFormBehaviour? {
+        return _formBehaviour.value
+    }
+	...
+}
+
+```
 
 ## Installation
 
+Since version 4.3.1 Dip is built with Swift 2.2. The latest version built with Swift 2.1 is 4.3.0.
+
 Dip is available through [CocoaPods](http://cocoapods.org). To install
 it, simply add the following line to your Podfile:
 
@@ -36,181 +145,38 @@ it, simply add the following line to your Podfile:
 pod "Dip"
 ```
 
-If you use _Carthage_ add this line to your Cartfile:
+If you use [Carthage](https://github.com/Carthage/Carthage) add this line to your Cartfile:
 
 ```
 github "AliSoftware/Dip"
 ```
 
-## Playground
-
-Dip comes with a **Playground** to introduce you to Inversion of Control, Dependency Injection, and how to use Dip in practice.
-
-To play with it, [open `Dip.xcworkspace`](Dip/Dip.xcworkspace), then click on the `DipPlayground` entry in Xcode's Project Navigator and let it be your guide.
-
-_Note: Do not open the `DipPlayground.playground` file directly, as it needs to be part of the workspace to access the Dip framework so that the demo code it contains can work._
-
-The next paragraphs give you an overview of the Usage of _Dip_ directly, but if you're new to Dependency Injection, the Playground is probably a better start.
-
-## Usage
-
-### Register instances and instance factories
-
-First, create a `DependencyContainer` and use it to register instances and factories with protocols, using those methods:
-
-* `register(instance: _)` will register a singleton instance with a given protocol.
-* `register(factory: _)` will register an instance factory — which generates a new instance each time you `resolve()`.
-* You need **cast the instance to the protocol type** you want to register it with (e.g. `register(instance: PlistUsersProvider() as UsersListProviderType)`).
-
-Typically, to register your dependencies as early as possible in your app life-cycle, you will declare a `let dip: DependencyContainer = { … }()` somewhere (for example [in a dedicated `.swift` file](https://github.com/AliSoftware/Dip/blob/master/Example/DipSampleApp/DependencyContainers.swift#L22-L27)). In your (non-hosted, standalone) unit tests, you'll probably [reset them in your `func setUp()`](https://github.com/AliSoftware/Dip/blob/master/Example/Tests/SWAPIPersonProviderTests.swift#L17-L21) instead.
-
-### Resolve dependencies
-
-* `resolve()` will return a new instance matching the requested protocol.
-* Explicitly specify the return type of `resolve` so that Swift's type inference knows which protocol you're trying to resolve.
-* If that protocol was registered as a singleton instance (using `register(instance: …)`, the same instance will be returned each time you call `resolve()` for this protocol type. Otherwise, the instance factory will generate a new instance each time.
-
-### Using block-based initialization
-
-When calling the initializer of `DependencyContainer()`, you can pass a block that will be called right after the initialization. This allows you to have a nice syntax to do all your `register(…)` calls in there, instead of having to do them separately.
-
-It may not seem to provide much, but given the fact that `DependencyContainers` are typically declared as global constants using a top-level `let`, it gets very useful, because instead of having to do it like this:
+If you use [Swift Package Manager](https://swift.org/package-manager/) add Dip as dependency to you `Package.swift`:
 
 ```swift
-let dip: DependencyContainer = {
-    let dip = DependencyContainer()
-
-    dip.register(instance: ProductionEnvironment(analytics: true) as EnvironmentType)
-    dip.register(instance: WebService() as WebServiceAPI)
-
-    return dip
-    }()
+let package = Package(
+  name: "MyPackage",
+  dependencies: [
+    .Package(url: "https://github.com/AliSoftware/Dip.git", "4.5.0")
+  ]
+)
 ```
 
-You can instead write this exact equivalent code, which is more compact, and indent better in Xcode (as the final closing brack is properly aligned):
+## Running tests
 
-```swift
-let dip = DependencyContainer { dip in
-    dip.register(instance: ProductionEnvironment(analytics: true) as EnvironmentType)
-    dip.register(instance: WebService() as WebServiceAPI)
-}
-```
-
-### Using tags to associate various factories to one protocol
-
-* If you give a `tag` in the parameter to `register()`, it will associate that instance or factory with this tag, which can be used later during `resolve` (see below).
-* `resolve(tag: tag)` will try to find an instance (or instance factory) that match both the requested protocol _and_ the tag. If it doesn't find any, it will fallback to an instance (or instance factory) that only match the requested protocol.
-* The tags can be StringLiteralType or IntegerLiteralType. That said you can use plain strings or integers as tags.
-
-
-```swift
-enum WebService: String {
-    case PersonWS
-    case StarshipWS
-    var tag: Tag { return Tag.String(self.rawValue) }
-}
-
-let wsDependencies = DependencyContainer() { dip in
-    dip.register(tag: WebService.PersonWS.tag, instance: URLSessionNetworkLayer(baseURL: "http://prod.myapi.com/api/")! as NetworkLayer)
-    dip.register(tag: WebService.StashipWS.tag, instance: URLSessionNetworkLayer(baseURL: "http://dev.myapi.com/api/")! as NetworkLayer)
-}
-
-let networkLayer = dip.resolve(tag: WebService.PersonWS.tag) as NetworkLayer
-```
-
-### Runtime arguments
-
-You can register factories that accept up to six arguments. When you resolve dependency you can pass those arguments to `resolve()` method and they will be passed to the factory. Note that _number_, _types_ and _order_ of parameters matters. Also use of optional parameter and not optional parameter will result in two factories registered in container.
-
-```swift
-let webServices = DependencyContainer() { webServices in
-	webServices.register { (url: NSURL, port: Int) in WebServiceImp1(url, port: port) as WebServiceAPI }
-	webServices.register { (port: Int, url: NSURL) in WebServiceImp2(url, port: port) as WebServiceAPI }
-	webServices.register { (port: Int, url: NSURL?) in WebServiceImp3(url!, port: port) as WebServiceAPI }
-}
-
-let service1 = webServices.resolve(NSURL(string: "http://example.url")!, 80) as WebServiceAPI // service1 is WebServiceImp1
-let service2 = webServices.resolve(80, NSURL(string: "http://example.url")!) as WebServiceAPI // service2 is WebServiceImp2
-let service3 = webServices.resolve(80, NSURL(string: "http://example.url")) as WebServiceAPI // service3 is WebServiceImp3
+On OSX you can run tests from Xcode. On Linux you need to have Swift Package Manager installed and use it to build and run tests:
 
 ```
-Though Dip provides support for up to six runtime arguments out of the box you can extend this number using following code snippet for seven arguments:
-
-```
-func register<T, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7>(tag: Tag? = nil, factory: (Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7) -> T) -> DefinitionOf<T> {
-	return register(tag, factory: factory, scope: .Prototype) as DefinitionOf<T>
-}
-	
-func resolve<T, Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7>(tag tag: Tag? = nil, _ arg1: Arg1, _ arg2: Arg2, _ arg3: Arg3, _ arg4: Arg4, _ arg5: Arg5, _ arg6: Arg6, _ arg7: Arg7) -> T {
-	return resolve(tag) { (factory: (Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7) -> T) in factory(arg1, arg2, arg3, arg4, arg5, arg6, arg7) }
-}
-
+cd Dip
+swift build && swift test
 ```
 
-### Concrete Example
-
-Somewhere in your App target, register the dependencies:
-
-```swift
-let dip: DependencyContainer = {
-    let dip = DependencyContainer()
-    let env = ProductionEnvironment(analytics: true)
-    dip.register(instance: env as EnvironmentType)
-    dip.register(instance: WebService() as WebServiceType)
-    dip.register() { name: String in DummyFriendsProvider(user: name) as FriendsProviderType }
-    dip.register(tag: "me") { _: String in PlistFriendsProvider(plist: "myfriends") as FriendsProviderType }
-    return dip
-}
-```
-
-> Do the same in your Unit Tests target & test cases, but obviously with different Dependencies registered, depending on what you want to test and what instances you need to inject to provide dummy implementations for your tests.
-
-
-Then to use dependencies throughout your app, use `dip.resolve()`, like this:
-
-```swift
-struct WebService {
-  let env: EnvironmentType = dip.resolve()
-  func sendRequest(path: String, …) {
-    // ... use stuff like env.baseURL here
-  }
-}
-
-struct SomeViewModel {
-  let ws: WebServiceType = dip.resolve()
-  var friendsProvider: FriendsProviderType
-  init(userName: String) {
-    friendsProvider = dip.resolve(tag: userName, userName)
-  }
-  func foo() {
-    ws.someMethodDeclaredOnWebServiceType()
-    let friends = friendsProvider.someFriendsProviderTypeMethod()
-    print("friends: \(friends)")
-  }
-```
-
-This way, when running your app target:
-
-* `ws` will be resolved as your singleton instance `WebService` registered before.
-* `friendsProvider` will be resolved as a new instance each time, which will be an instance created via `PlistFriendsProvider(plist: "myfriends")` if `userName` is `me` and created via `DummyFriendsProvider(userName)` for any other `userName` value (because `resolve(tag: userName, userName)` will fallback to `resolve(tag: nil, userName)` in that case, using the instance factory which was registered without a tag, but will pass `userName` as argument).
-
-But when running your Unit tests target, it will probably resolve to other instances, depending on how you registered your dependencies in your Test Case.
-
-### Complete Example Project
-
-In addition to this Usage overview and to the aforementioned playground, you can also find a complete example in the `SampleApp/DipSampleApp` project provided in this repository.
-
-This sample project is a bit more complex, but closer to real-world applications (even if this sample is all about StarWars!),
-by declaring protocols like `NetworkLayer` which can be resolved to a `URLSessionNetworkLayer` in the real app, but to a dummy
-network layer returning fixture data during the Unit Tests.
-
-This sample uses the Star Wars API provided by swapi.co to fetch Star Wars characters and starships info and display them in TableViews.
-
+> Note: Swift Package Manager is destributed with Swift development snapshots only, so it builds packages using Swift 3. To build Dip you will need to build it with Swift 2.2, for that you need to set [`$SWIFT_EXEC`](https://github.com/apple/swift-package-manager#choosing-swift-version) environment variable.
 
 ## Credits
 
 This library has been created by [**Olivier Halligon**](olivier@halligon.net).  
-I'd also like to thank **Ilya Puchka** for his big contribution to it, as he added a lot of great features to it.
+I'd also like to thank [**Ilya Puchka**](https://twitter.com/ilyapuchka) for his big contribution to it, as he added a lot of great features to it.
 
 **Dip** is available under the **MIT license**. See the `LICENSE` file for more info.
 

SampleApp/DipSampleApp.xcodeproj/project.pbxproj

@@ -10,14 +10,12 @@
 		090012291BC6FECA0079C600 /* BaseCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 090012161BC6FECA0079C600 /* BaseCell.swift */; };
 		0900122A1BC6FECA0079C600 /* PersonCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 090012171BC6FECA0079C600 /* PersonCell.swift */; };
 		0900122C1BC6FECA0079C600 /* PersonProviderAPI.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0900121B1BC6FECA0079C600 /* PersonProviderAPI.swift */; };
-		0900122D1BC6FECA0079C600 /* DummyPilotProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0900121C1BC6FECA0079C600 /* DummyPilotProvider.swift */; };
-		0900122E1BC6FECA0079C600 /* HardCodedStarshipProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0900121D1BC6FECA0079C600 /* HardCodedStarshipProvider.swift */; };
-		0900122F1BC6FECA0079C600 /* PlistPersonProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0900121E1BC6FECA0079C600 /* PlistPersonProvider.swift */; };
 		0900123B1BC6FF4D0079C600 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 0900123A1BC6FF4D0079C600 /* Main.storyboard */; };
 		0900123D1BC7012A0079C600 /* StarshipProviderAPI.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0900123C1BC7012A0079C600 /* StarshipProviderAPI.swift */; };
 		090012401BC704C60079C600 /* Person.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0900123F1BC704C60079C600 /* Person.swift */; };
 		090012421BC7059E0079C600 /* Starship.swift in Sources */ = {isa = PBXBuildFile; fileRef = 090012411BC7059E0079C600 /* Starship.swift */; };
-		090012441BC708A00079C600 /* DummyStarshipProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 090012431BC708A00079C600 /* DummyStarshipProvider.swift */; };
+		0982AF081C503EEE00B62463 /* FakePersonsProviders.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0982AF071C503EEE00B62463 /* FakePersonsProviders.swift */; };
+		0982AF0A1C50401800B62463 /* FakeStarshipProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0982AF091C50401800B62463 /* FakeStarshipProvider.swift */; };
 		099022621BC123C000E76F43 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 099022611BC123C000E76F43 /* AppDelegate.swift */; };
 		099022691BC123C000E76F43 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 099022681BC123C000E76F43 /* Assets.xcassets */; };
 		0990226C1BC123C000E76F43 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 0990226A1BC123C000E76F43 /* LaunchScreen.storyboard */; };
@@ -52,14 +50,12 @@
 		090012161BC6FECA0079C600 /* BaseCell.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = BaseCell.swift; sourceTree = "<group>"; };
 		090012171BC6FECA0079C600 /* PersonCell.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PersonCell.swift; sourceTree = "<group>"; };
 		0900121B1BC6FECA0079C600 /* PersonProviderAPI.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PersonProviderAPI.swift; sourceTree = "<group>"; };
-		0900121C1BC6FECA0079C600 /* DummyPilotProvider.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DummyPilotProvider.swift; sourceTree = "<group>"; };
-		0900121D1BC6FECA0079C600 /* HardCodedStarshipProvider.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = HardCodedStarshipProvider.swift; sourceTree = "<group>"; };
-		0900121E1BC6FECA0079C600 /* PlistPersonProvider.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PlistPersonProvider.swift; sourceTree = "<group>"; };
 		0900123A1BC6FF4D0079C600 /* Main.storyboard */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.storyboard; path = Main.storyboard; sourceTree = "<group>"; };
 		0900123C1BC7012A0079C600 /* StarshipProviderAPI.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StarshipProviderAPI.swift; sourceTree = "<group>"; };
 		0900123F1BC704C60079C600 /* Person.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Person.swift; sourceTree = "<group>"; };
 		090012411BC7059E0079C600 /* Starship.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Starship.swift; sourceTree = "<group>"; };
-		090012431BC708A00079C600 /* DummyStarshipProvider.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DummyStarshipProvider.swift; sourceTree = "<group>"; };
+		0982AF071C503EEE00B62463 /* FakePersonsProviders.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FakePersonsProviders.swift; sourceTree = "<group>"; };
+		0982AF091C50401800B62463 /* FakeStarshipProvider.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FakeStarshipProvider.swift; sourceTree = "<group>"; };
 		0990225F1BC123C000E76F43 /* DipSampleApp.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = DipSampleApp.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		099022611BC123C000E76F43 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		099022681BC123C000E76F43 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
@@ -150,8 +146,7 @@
 		090012381BC6FEFD0079C600 /* PersonProviders */ = {
 			isa = PBXGroup;
 			children = (
-				0900121C1BC6FECA0079C600 /* DummyPilotProvider.swift */,
-				0900121E1BC6FECA0079C600 /* PlistPersonProvider.swift */,
+				0982AF071C503EEE00B62463 /* FakePersonsProviders.swift */,
 				09D796121BC9A5BC003C68EB /* SWAPIPersonProvider.swift */,
 			);
 			name = PersonProviders;
@@ -160,8 +155,7 @@
 		090012391BC6FF080079C600 /* StarshipProviders */ = {
 			isa = PBXGroup;
 			children = (
-				090012431BC708A00079C600 /* DummyStarshipProvider.swift */,
-				0900121D1BC6FECA0079C600 /* HardCodedStarshipProvider.swift */,
+				0982AF091C50401800B62463 /* FakeStarshipProvider.swift */,
 				09D7961A1BC9BE65003C68EB /* SWAPIStarshipProvider.swift */,
 			);
 			name = StarshipProviders;
@@ -342,25 +336,23 @@
 			buildActionMask = 2147483647;
 			files = (
 				09D796151BC9A5FC003C68EB /* NetworkLayer.swift in Sources */,
+				0982AF081C503EEE00B62463 /* FakePersonsProviders.swift in Sources */,
 				09D795FF1BC71F5A003C68EB /* PersonListViewController.swift in Sources */,
 				0900122A1BC6FECA0079C600 /* PersonCell.swift in Sources */,
 				09D796011BC722C0003C68EB /* StarshipListViewController.swift in Sources */,
 				0900122C1BC6FECA0079C600 /* PersonProviderAPI.swift in Sources */,
 				09D7961D1BC9C62E003C68EB /* SWAPICommon.swift in Sources */,
 				090012291BC6FECA0079C600 /* BaseCell.swift in Sources */,
-				0900122D1BC6FECA0079C600 /* DummyPilotProvider.swift in Sources */,
 				099022621BC123C000E76F43 /* AppDelegate.swift in Sources */,
 				09D796131BC9A5BC003C68EB /* SWAPIPersonProvider.swift in Sources */,
 				090012421BC7059E0079C600 /* Starship.swift in Sources */,
 				0900123D1BC7012A0079C600 /* StarshipProviderAPI.swift in Sources */,
+				0982AF0A1C50401800B62463 /* FakeStarshipProvider.swift in Sources */,
 				09D7961B1BC9BE65003C68EB /* SWAPIStarshipProvider.swift in Sources */,
-				0900122E1BC6FECA0079C600 /* HardCodedStarshipProvider.swift in Sources */,
 				09D796071BC73E8B003C68EB /* StoryboardConstants.swift in Sources */,
 				09D796031BC72691003C68EB /* StarshipCell.swift in Sources */,
 				090012401BC704C60079C600 /* Person.swift in Sources */,
-				090012441BC708A00079C600 /* DummyStarshipProvider.swift in Sources */,
 				09D7960D1BC7431C003C68EB /* FetchableTrait.swift in Sources */,
-				0900122F1BC6FECA0079C600 /* PlistPersonProvider.swift in Sources */,
 				09D796191BC9BA49003C68EB /* DependencyContainers.swift in Sources */,
 				09D796171BC9B53D003C68EB /* URLSessionNetworkLayer.swift in Sources */,
 			);

SampleApp/DipSampleApp/AppDelegate.swift

@@ -7,21 +7,34 @@
 //
 
 import UIKit
+import Dip
 
 @UIApplicationMain
 class AppDelegate: UIResponder, UIApplicationDelegate {
 
     var window: UIWindow?
     
+    private let container = DependencyContainer()
+    
     func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
         // Override point for customization after application launch.
         
+        //This is a composition root where container is configured and all dependencies are resolved
+        configureContainer(container)
+        
+        let personProvider = try! container.resolve() as PersonProviderAPI
+        let starshipProvider = try! container.resolve() as StarshipProviderAPI
+        
         if let tabBarVC = self.window?.rootViewController as? UITabBarController,
             let vcs = tabBarVC.viewControllers as? [UINavigationController] {
                 if let personListVC = vcs[0].topViewController as? PersonListViewController {
+                    personListVC.personProvider = personProvider
+                    personListVC.starshipProvider = starshipProvider
                     personListVC.loadFirstPage()
                 }
                 if let starshipListVC = vcs[1].topViewController as? StarshipListViewController {
+                    starshipListVC.starshipProvider = starshipProvider
+                    starshipListVC.personProvider = personProvider
                     starshipListVC.loadFirstPage()
                 }
         }

SampleApp/DipSampleApp/Cells/BaseCell.swift

@@ -36,6 +36,6 @@ extension BaseCell where Self : UITableViewCell {
 }
 
 protocol FillableCell: BaseCell {
-    typealias ObjectType
+    associatedtype ObjectType
     func fillWithObject(object: ObjectType)
 }

SampleApp/DipSampleApp/DependencyContainers.swift

@@ -17,42 +17,58 @@ private let FAKE_STARSHIPS = false
 /* ---- */
 
 
-
-// MARK: Dependency Container for WebServices & NetworkLayer
-let wsDependencies = DependencyContainer() { dip in
-    
-    // Register the NetworkLayer, same for everyone here (but we have the ability to register a different one for a specific WebService if we wanted to)
-    dip.register(instance: URLSessionNetworkLayer(baseURL: "http://swapi.co/api/")! as NetworkLayer)
-    
+enum DependencyTags: Int, DependencyTagConvertible {
+    case Hardcoded
+    case Dummy
 }
 
-
 // MARK: Dependency Container for Providers
-let providerDependencies = DependencyContainer() { dip in
+func configureContainer(dip: DependencyContainer) {
     
+    // Register the NetworkLayer, same for everyone here (but we have the ability to register a different one for a specific WebService if we wanted to)
+    dip.register(.Singleton) { URLSessionNetworkLayer(baseURL: "http://swapi.co/api/")! as NetworkLayer }
+
     if FAKE_PERSONS {
         
-        // 1) Register the PersonProviderAPI singleton, one generic and one specific for a specific personID
-        dip.register(instance: DummyPilotProvider() as PersonProviderAPI)
-        dip.register(tag: 0, instance: PlistPersonProvider(plist: "mainPilot") as PersonProviderAPI)
+        // 1) Register fake persons provider
+        //Here we use constructor injection for one of the dependencies property injection for another, and we provide dependencies manually
+        dip.register() { FakePersonsProvider(dummyProvider: DummyPilotProvider()) as PersonProviderAPI }
+            .resolveDependencies { (_, resolved: PersonProviderAPI) in
+                //here we resolve optional dependencies
+                //see what happens when you comment this out
+                (resolved as! FakePersonsProvider).plistProvider = PlistPersonProvider(plist: "mainPilot")
+        }
         
     } else {
         
         // 1) Register the SWAPIPersonProvider (that hits the real swapi.co WebService)
-        dip.register(instance: SWAPIPersonProvider() as PersonProviderAPI)
+        // Here we use constructor injection again, but let the container to resolve dependency for us
+        dip.register() { SWAPIPersonProvider(webService: try dip.resolve()) as PersonProviderAPI }
 
     }
     
     if FAKE_STARSHIPS {
 
-        // 2) Register the StarshipProviderAPI factories, one generic and one specific for a specific starshipID
-        dip.register() { HardCodedStarshipProvider() as StarshipProviderAPI }
-        dip.register(tag: 0) { DummyStarshipProvider(pilotName: "Main Pilot") as StarshipProviderAPI }
+        // 2) Register fake starships provider
+        
+        //Here we register different implementations for the same protocol using tags
+        dip.register(tag: DependencyTags.Hardcoded) { HardCodedStarshipProvider() as StarshipProviderAPI }
+        
+        //Here we register factory that will require a runtime argument
+        dip.register(tag: DependencyTags.Dummy) { DummyStarshipProvider(pilotName: $0) as StarshipProviderAPI }
+        
+        //Here we use constructor injection, but instead of providing dependencies manually container resolves them for us
+        dip.register() {
+            FakeStarshipProvider(
+                dummyProvider: try dip.resolve(tag: DependencyTags.Dummy, withArguments: "Main Pilot"),
+                hardCodedProvider: try dip.resolve(tag: DependencyTags.Hardcoded)) as StarshipProviderAPI
+        }
         
     } else {
         
         // 2) Register the SWAPIStarshipProvider (that hits the real swapi.co WebService)
-        dip.register(instance: SWAPIStarshipProvider() as StarshipProviderAPI)
+        // Here we use constructor injection again, but let the container to resolve dependency for us
+        dip.register() { SWAPIStarshipProvider(webService: try dip.resolve()) as StarshipProviderAPI }
 
     }
     

SampleApp/DipSampleApp/Main.storyboard

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="9059" systemVersion="15B42" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="Nnt-Mi-Wf8">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="9531" systemVersion="15C50" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="Nnt-Mi-Wf8">
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="9049"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="9529"/>
         <capability name="Constraints with non-1.0 multipliers" minToolsVersion="5.1"/>
     </dependencies>
     <scenes>
@@ -13,7 +13,6 @@
                     <tabBar key="tabBar" contentMode="scaleToFill" id="hlX-Lx-tB1">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="49"/>
                         <autoresizingMask key="autoresizingMask"/>
-                        <animations/>
                         <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
                     </tabBar>
                     <connections>
@@ -32,96 +31,83 @@
                     <tableView key="view" clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="95" sectionHeaderHeight="28" sectionFooterHeight="28" id="EYu-RQ-JO9">
                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <animations/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                         <prototypes>
                             <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="default" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="PersonCell" rowHeight="95" id="Sba-Wm-z4c" customClass="PersonCell" customModule="DipSampleApp" customModuleProvider="target">
                                 <rect key="frame" x="0.0" y="28" width="600" height="95"/>
                                 <autoresizingMask key="autoresizingMask"/>
                                 <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="Sba-Wm-z4c" id="UE9-zV-NsG">
-                                    <rect key="frame" x="0.0" y="0.0" width="567" height="94.5"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="567" height="94"/>
                                     <autoresizingMask key="autoresizingMask"/>
                                     <subviews>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" text="Name:" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="gVy-Vx-i2h">
-                                            <rect key="frame" x="8" y="8" width="49" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="8" y="8" width="49" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" text="Height (cm):" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ymL-8F-Mpa">
-                                            <rect key="frame" x="8" y="35" width="94" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="8" y="36" width="94" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" text="Mass (kg):" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="9sd-2A-Ixx">
-                                            <rect key="frame" x="8" y="63" width="79" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="8" y="64" width="79" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" text="Eyes:" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="YPu-dh-Fhf">
-                                            <rect key="frame" x="378" y="63" width="41" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="378" y="64" width="41" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="1CQ-rV-Y7c">
                                             <rect key="frame" x="539" y="8" width="20" height="20"/>
-                                            <animations/>
                                             <constraints>
                                                 <constraint firstAttribute="width" constant="20" id="PK0-f1-YTg"/>
                                                 <constraint firstAttribute="height" constant="20" id="TOR-23-CAr"/>
                                             </constraints>
                                         </imageView>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-name-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="GhU-yA-Nkj">
-                                            <rect key="frame" x="110" y="7" width="421" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="110" y="7" width="421" height="21"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-height-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="VLd-vh-c8m">
-                                            <rect key="frame" x="110" y="34" width="260.5" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="110" y="35" width="260" height="21"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-mass-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="zgG-Ij-dCY">
-                                            <rect key="frame" x="110" y="62" width="260" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="110" y="63" width="260" height="21"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-hair-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="7TM-Aw-IPT">
-                                            <rect key="frame" x="427" y="34" width="120" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="427" y="35" width="120" height="21"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-eyes-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Hv7-qr-iAY">
-                                            <rect key="frame" x="427" y="62" width="120" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="427" y="63" width="120" height="21"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" text="Hair:" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="rDV-iQ-Ugd">
-                                            <rect key="frame" x="378" y="35" width="36.5" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="378" y="36" width="37" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                     </subviews>
-                                    <animations/>
                                     <constraints>
                                         <constraint firstItem="Hv7-qr-iAY" firstAttribute="baseline" secondItem="YPu-dh-Fhf" secondAttribute="baseline" id="590-8v-aT3"/>
                                         <constraint firstItem="zgG-Ij-dCY" firstAttribute="baseline" secondItem="9sd-2A-Ixx" secondAttribute="baseline" id="62H-PJ-mjV"/>
@@ -152,7 +138,6 @@
                                         <constraint firstItem="rDV-iQ-Ugd" firstAttribute="leading" secondItem="VLd-vh-c8m" secondAttribute="trailing" constant="8" symbolic="YES" id="xL3-7N-f8f"/>
                                     </constraints>
                                 </tableViewCellContentView>
-                                <animations/>
                                 <connections>
                                     <outlet property="eyesLabel" destination="Hv7-qr-iAY" id="bhd-4V-chX"/>
                                     <outlet property="genderImageView" destination="1CQ-rV-Y7c" id="8rr-1s-qr4"/>
@@ -182,75 +167,65 @@
                     <tableView key="view" clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="102" sectionHeaderHeight="28" sectionFooterHeight="28" id="uPj-BZ-JVx">
                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <animations/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                         <prototypes>
                             <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="default" accessoryType="disclosureIndicator" indentationWidth="10" reuseIdentifier="StarshipCell" rowHeight="102" id="rfe-RG-ql1" customClass="StarshipCell" customModule="DipSampleApp" customModuleProvider="target">
                                 <rect key="frame" x="0.0" y="28" width="600" height="102"/>
                                 <autoresizingMask key="autoresizingMask"/>
                                 <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="rfe-RG-ql1" id="RHz-uO-ANq">
-                                    <rect key="frame" x="0.0" y="0.0" width="567" height="101.5"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="567" height="101"/>
                                     <autoresizingMask key="autoresizingMask"/>
                                     <subviews>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" text="Name:" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="pR4-Aq-S9H">
-                                            <rect key="frame" x="8" y="8" width="49" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="8" y="8" width="49" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" text="Model:" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="V8k-Fh-teX">
-                                            <rect key="frame" x="8" y="33" width="52" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="8" y="34" width="52" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" text="Manufacturer:" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="iWU-h6-HNF">
-                                            <rect key="frame" x="8" y="61" width="108" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="8" y="62" width="108" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" horizontalCompressionResistancePriority="1000" text="Crew:" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="JoH-bT-HcN">
-                                            <rect key="frame" x="460" y="33" width="44.5" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="459" y="34" width="45" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="750" verticalHuggingPriority="251" horizontalCompressionResistancePriority="1000" text="Pass:" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="arT-4h-pLt">
-                                            <rect key="frame" x="463" y="61" width="41" height="19.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="463" y="62" width="41" height="20"/>
                                             <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
                                             <color key="textColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-name-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Lwe-Ix-EQE">
-                                            <rect key="frame" x="124" y="7" width="423" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="124" y="7" width="423" height="21"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" horizontalCompressionResistancePriority="500" text="-model-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="kIz-wz-fGn">
-                                            <rect key="frame" x="124" y="32" width="328" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="124" y="33" width="327" height="21"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" horizontalCompressionResistancePriority="500" text="-manufacturer-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="fVY-W3-78a">
-                                            <rect key="frame" x="124" y="60" width="331" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="124" y="61" width="331" height="21"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-crew-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="WGV-Ar-PMC">
-                                            <rect key="frame" x="512" y="32" width="35" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="512" y="33" width="35" height="21"/>
                                             <constraints>
                                                 <constraint firstAttribute="width" constant="35" id="tsk-nr-zwr"/>
                                             </constraints>
@@ -259,14 +234,12 @@
                                             <nil key="highlightedColor"/>
                                         </label>
                                         <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="-pass-" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="YnA-qH-8AA">
-                                            <rect key="frame" x="512" y="60" width="35" height="20.5"/>
-                                            <animations/>
+                                            <rect key="frame" x="512" y="61" width="35" height="21"/>
                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                             <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                             <nil key="highlightedColor"/>
                                         </label>
                                     </subviews>
-                                    <animations/>
                                     <constraints>
                                         <constraint firstAttribute="trailing" secondItem="YnA-qH-8AA" secondAttribute="trailing" constant="20" symbolic="YES" id="0iR-Ax-Tba"/>
                                         <constraint firstItem="pR4-Aq-S9H" firstAttribute="leading" secondItem="iWU-h6-HNF" secondAttribute="leading" id="1dW-gb-Qyn"/>
@@ -294,7 +267,6 @@
                                         <constraint firstItem="WGV-Ar-PMC" firstAttribute="leading" secondItem="YnA-qH-8AA" secondAttribute="leading" id="ycM-ic-t05"/>
                                     </constraints>
                                 </tableViewCellContentView>
-                                <animations/>
                                 <connections>
                                     <outlet property="crewLabel" destination="WGV-Ar-PMC" id="f6d-9q-59z"/>
                                     <outlet property="manufacturerLabel" destination="fVY-W3-78a" id="ABE-NG-bZY"/>
@@ -324,7 +296,6 @@
                     <navigationBar key="navigationBar" contentMode="scaleToFill" id="VfI-ho-mqu">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
                         <autoresizingMask key="autoresizingMask"/>
-                        <animations/>
                     </navigationBar>
                     <connections>
                         <segue destination="nuL-fZ-hCQ" kind="relationship" relationship="rootViewController" id="l50-ri-Dfy"/>
@@ -342,7 +313,6 @@
                     <navigationBar key="navigationBar" contentMode="scaleToFill" id="YPS-Al-CkA">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
                         <autoresizingMask key="autoresizingMask"/>
-                        <animations/>
                     </navigationBar>
                     <connections>
                         <segue destination="I87-Zh-w4A" kind="relationship" relationship="rootViewController" id="07W-Xm-zjJ"/>

SampleApp/DipSampleApp/Providers/DummyPilotProvider.swift

@@ -1,34 +0,0 @@
-//
-//  DummyPilotProvider.swift
-//  Dip
-//
-//  Created by Olivier Halligon on 12/09/2015.
-//  Copyright © 2015 AliSoftware. All rights reserved.
-//
-
-import Foundation
-
-struct DummyPilotProvider : PersonProviderAPI {
-    
-    func fetchIDs(completion: [Int] -> Void) {
-        completion(Array(0..<5))
-    }
-    
-    func fetch(id: Int, completion: Person? -> Void) {
-        completion(dummyPerson(id))
-    }
-    
-    private func dummyPerson(idx: Int) -> Person {
-        let colors = ["blue", "brown", "yellow", "orange", "red", "dark"]
-        let genders: [Gender?] = [Gender.Male, Gender.Female, nil]
-        return Person(
-            name: "John Dummy Doe #\(idx)",
-            height: 150 + (idx*27%40),
-            mass: 50 + (idx*7%30),
-            hairColor: colors[idx*3%colors.count],
-            eyeColor: colors[idx*2%colors.count],
-            gender: genders[idx%3],
-            starshipIDs: [idx % 3, 2*idx % 4]
-        )
-    }
-}

SampleApp/DipSampleApp/Providers/DummyStarshipProvider.swift

@@ -1,33 +0,0 @@
-//
-//  DummyStarshipProvider.swift
-//  Dip
-//
-//  Created by Olivier Halligon on 08/10/2015.
-//  Copyright © 2015 AliSoftware. All rights reserved.
-//
-
-import Foundation
-
-struct DummyStarshipProvider : StarshipProviderAPI {
-    var pilotName: String
-    
-    func fetchIDs(completion: [Int] -> Void) {
-        let nbShips = pilotName.characters.count
-        completion(Array(0..<nbShips))
-    }
-    
-    func fetch(id: Int, completion: Starship? -> Void) {
-        completion(dummyStarship(id))
-    }
-    
-    private func dummyStarship(idx: Int) -> Starship {
-        return Starship(
-            name: "\(pilotName)'s awesome starship #\(idx)",
-            model: "\(pilotName)Ship",
-            manufacturer: "Dummy Industries",
-            crew: 1 + (idx%3),
-            passengers: 10 + (idx*7 % 40),
-            pilotIDs: [idx]
-        )
-    }
-}

SampleApp/DipSampleApp/Providers/FakePersonsProviders.swift

@@ -2,12 +2,39 @@
 //  PlistPersonProvider.swift
 //  Dip
 //
-//  Created by Olivier Halligon on 12/09/2015.
+//  Created by Ilya Puchka on 12/09/2015.
 //  Copyright © 2015 AliSoftware. All rights reserved.
 //
 
 import Foundation
 
+///Provides some dummy Person entities
+struct DummyPilotProvider : PersonProviderAPI {
+    
+    func fetchIDs(completion: [Int] -> Void) {
+        completion(Array(0..<5))
+    }
+    
+    func fetch(id: Int, completion: Person? -> Void) {
+        completion(dummyPerson(id))
+    }
+    
+    private func dummyPerson(idx: Int) -> Person {
+        let colors = ["blue", "brown", "yellow", "orange", "red", "dark"]
+        let genders: [Gender?] = [Gender.Male, Gender.Female, nil]
+        return Person(
+            name: "John Dummy Doe #\(idx)",
+            height: 150 + (idx*27%40),
+            mass: 50 + (idx*7%30),
+            hairColor: colors[idx*3%colors.count],
+            eyeColor: colors[idx*2%colors.count],
+            gender: genders[idx%3],
+            starshipIDs: [idx % 3, 2*idx % 4]
+        )
+    }
+}
+
+///Provides Person entities reading then from plist file
 class PlistPersonProvider : PersonProviderAPI {
     let people: [Person]
     
@@ -59,3 +86,29 @@ class PlistPersonProvider : PersonProviderAPI {
         )
     }
 }
+
+class FakePersonsProvider: PersonProviderAPI {
+    
+    let dummyProvider: PersonProviderAPI
+    var plistProvider: PersonProviderAPI!
+    
+    //In this class we use both constructor injection and property injection,
+    //nil is a valid local default
+    init(dummyProvider: PersonProviderAPI) {
+        self.dummyProvider = dummyProvider
+    }
+    
+    func fetchIDs(completion: [Int] -> Void) {
+        dummyProvider.fetchIDs(completion)
+    }
+    
+    func fetch(id: Int, completion: Person? -> Void) {
+        if let plistProvider = plistProvider where id == 0 {
+            plistProvider.fetch(id, completion: completion)
+        }
+        else {
+            dummyProvider.fetch(id, completion: completion)
+        }
+    }
+
+}

SampleApp/DipSampleApp/Providers/FakeStarshipProvider.swift

@@ -0,0 +1,84 @@
+//
+//  FakeStarshipProvider.swift
+//  DipSampleApp
+//
+//  Created by Ilya Puchka on 20.01.16.
+//  Copyright © 2016 AliSoftware. All rights reserved.
+//
+
+import Foundation
+
+///Provides some dummy Starship entities
+struct DummyStarshipProvider : StarshipProviderAPI {
+    var pilotName: String
+    
+    func fetchIDs(completion: [Int] -> Void) {
+        let nbShips = pilotName.characters.count
+        completion(Array(0..<nbShips))
+    }
+    
+    func fetch(id: Int, completion: Starship? -> Void) {
+        completion(dummyStarship(id))
+    }
+    
+    private func dummyStarship(idx: Int) -> Starship {
+        return Starship(
+            name: "\(pilotName)'s awesome starship #\(idx)",
+            model: "\(pilotName)Ship",
+            manufacturer: "Dummy Industries",
+            crew: 1 + (idx%3),
+            passengers: 10 + (idx*7 % 40),
+            pilotIDs: [idx]
+        )
+    }
+}
+
+///Provides hardcoded Starship entities stored in memory
+class HardCodedStarshipProvider : StarshipProviderAPI {
+    
+    let starships = [
+        Starship(name: "First Ship", model: "AwesomeShip", manufacturer: "HardCoded Inc.", crew: 3, passengers: 20, pilotIDs: [1,2]),
+        Starship(name: "Second Ship", model: "AwesomeShip Express", manufacturer: "HardCoded Inc.", crew: 4, passengers: 10, pilotIDs: [1]),
+        Starship(name: "Third Ship", model: "AwesomeShip Cargo", manufacturer: "HardCoded Inc.", crew: 12, passengers: 150, pilotIDs: [2]),
+        ] + Array(4..<75).map { Starship(name: "Ship #\($0)", model: "AwesomeShip Fighter", manufacturer: "HardCoded Inc.", crew: 1, passengers: 2, pilotIDs: [1]) }
+    
+    func fetchIDs(completion: [Int] -> Void) {
+        completion(Array(0..<starships.count))
+    }
+    
+    func fetch(id: Int, completion: Starship? -> Void) {
+        guard id < starships.count else {
+            completion(nil)
+            return
+        }
+        completion(starships[id])
+    }
+}
+
+class FakeStarshipProvider: StarshipProviderAPI {
+    
+    let dummyProvider: StarshipProviderAPI
+    let hardCodedProvider: StarshipProviderAPI
+    
+    //Constructor injection again here
+    init(dummyProvider: StarshipProviderAPI, hardCodedProvider: StarshipProviderAPI) {
+        self.dummyProvider = dummyProvider
+        self.hardCodedProvider = hardCodedProvider
+    }
+    
+    func fetchIDs(completion: [Int] -> Void) {
+        hardCodedProvider.fetchIDs(completion)
+    }
+    
+    func fetch(id: Int, completion: Starship? -> Void) {
+        if id == 0 {
+            dummyProvider.fetch(id, completion: completion)
+        }
+        else {
+            hardCodedProvider.fetch(id, completion: completion)
+        }
+    }
+    
+}
+
+

SampleApp/DipSampleApp/Providers/HardCodedStarshipProvider.swift

@@ -1,30 +0,0 @@
-//
-//  HardCodedStarshipProvider.swift
-//  Dip
-//
-//  Created by Olivier Halligon on 11/09/2015.
-//  Copyright © 2015 AliSoftware. All rights reserved.
-//
-
-import Foundation
-
-class HardCodedStarshipProvider : StarshipProviderAPI {
-    
-    let starships = [
-        Starship(name: "First Ship", model: "AwesomeShip", manufacturer: "HardCoded Inc.", crew: 3, passengers: 20, pilotIDs: [1,2]),
-        Starship(name: "Second Ship", model: "AwesomeShip Express", manufacturer: "HardCoded Inc.", crew: 4, passengers: 10, pilotIDs: [1]),
-        Starship(name: "Third Ship", model: "AwesomeShip Cargo", manufacturer: "HardCoded Inc.", crew: 12, passengers: 150, pilotIDs: [2]),
-        ] + Array(4..<75).map { Starship(name: "Ship #\($0)", model: "AwesomeShip Fighter", manufacturer: "HardCoded Inc.", crew: 1, passengers: 2, pilotIDs: [1]) }
-    
-    func fetchIDs(completion: [Int] -> Void) {
-        completion(Array(0..<starships.count))
-    }
-    
-    func fetch(id: Int, completion: Starship? -> Void) {
-        guard id < starships.count else {
-            completion(nil)
-            return
-        }
-        completion(starships[id])
-    }    
-}

SampleApp/DipSampleApp/Providers/SWAPICommon.swift

@@ -13,12 +13,6 @@ enum SWAPIError: ErrorType {
     case InvalidJSON
 }
 
-enum WebService: String {
-    case PersonWS
-    case StarshipWS
-    var tag: DependencyContainer.Tag { return DependencyContainer.Tag.String(self.rawValue) }
-}
-
 func idFromURLString(urlString: String) -> Int? {
     let url = NSURL(string: urlString)
     let idString = url.flatMap { $0.lastPathComponent }

SampleApp/DipSampleApp/Providers/SWAPIPersonProvider.swift

@@ -8,8 +8,17 @@
 
 import Foundation
 
+///Provides Person entitis fetching them with web service
 struct SWAPIPersonProvider : PersonProviderAPI {
-    let ws = wsDependencies.resolve(tag: WebService.PersonWS.tag) as NetworkLayer
+    let ws: NetworkLayer
+    
+    //Here we inject dependency using _constructor injection_ pattern.
+    //The alternative way is a _property injection_
+    //but it should be used only for optional dependencies
+    //where there is a good local default implementation
+    init(webService: NetworkLayer) {
+        self.ws = webService
+    }
     
     func fetchIDs(completion: [Int] -> Void) {
         ws.request("people") { response in

SampleApp/DipSampleApp/Providers/SWAPIStarshipProvider.swift

@@ -8,8 +8,17 @@
 
 import Foundation
 
+///Provides Starship entities fetching them using web service
 struct SWAPIStarshipProvider : StarshipProviderAPI {
-    let ws = wsDependencies.resolve(tag: WebService.StarshipWS.tag) as NetworkLayer
+    let ws: NetworkLayer
+    
+    //Here we inject dependency using _constructor injection_ pattern.
+    //The alternative way is a _property injection_
+    //but it should be used only for optional dependencies 
+    //where there is a good local default implementation
+    init(webService: NetworkLayer) {
+        self.ws = webService
+    }
     
     func fetchIDs(completion: [Int] -> Void) {
         ws.request("starships") { response in

SampleApp/DipSampleApp/Providers/URLSessionNetworkLayer.swift

@@ -8,6 +8,7 @@
 
 import Foundation
 
+///NetworkLayer implementation on top of NSURLSession
 struct URLSessionNetworkLayer : NetworkLayer {
     let baseURL: NSURL
     let session: NSURLSession

SampleApp/DipSampleApp/ViewControllers/FetchableTrait.swift

@@ -9,7 +9,7 @@
 import UIKit
 
 protocol FetchableTrait: class {
-    typealias ObjectType
+    associatedtype ObjectType
     var objects: [ObjectType]? { get set }
     var batchRequestID: Int { get set }
     var tableView: UITableView! { get }

SampleApp/DipSampleApp/ViewControllers/PersonListViewController.swift

@@ -11,14 +11,16 @@ import UIKit
 class PersonListViewController: UITableViewController, FetchableTrait {
     var objects: [Person]?
     var batchRequestID = 0
+    
+    var personProvider: PersonProviderAPI!
+    var starshipProvider: StarshipProviderAPI!
         
     func fetchIDs(completion: [Int] -> Void) {
-        let provider = providerDependencies.resolve() as PersonProviderAPI
-        return provider.fetchIDs(completion)
+        return personProvider.fetchIDs(completion)
     }
+    
     func fetchOne(personID: Int, completion: Person? -> Void) {
-        let provider = providerDependencies.resolve(tag: .Int(personID)) as PersonProviderAPI
-        return provider.fetch(personID, completion: completion)
+        return personProvider.fetch(personID, completion: completion)
     }
     
     var fetchProgress: (current: Int, total: Int?) = (0, nil) {
@@ -37,7 +39,7 @@ class PersonListViewController: UITableViewController, FetchableTrait {
             else {
                 fatalError()
         }
-        
+        destVC.starshipProvider = starshipProvider
         destVC.loadObjects(person.starshipIDs)
     }
 }

SampleApp/DipSampleApp/ViewControllers/StarshipListViewController.swift

@@ -13,15 +13,14 @@ class StarshipListViewController : UITableViewController, FetchableTrait {
     var objects: [Starship]?
     var batchRequestID = 0
     
-    private func provider(tag:Int?) -> StarshipProviderAPI {
-        return providerDependencies.resolve(tag: tag.flatMap { .Int($0) })
-    }
+    var starshipProvider: StarshipProviderAPI!
+    var personProvider: PersonProviderAPI!
     
     func fetchIDs(completion: [Int] -> Void) {
-        provider(nil).fetchIDs(completion)
+        starshipProvider.fetchIDs(completion)
     }
     func fetchOne(shipID:Int, completion: Starship? -> Void) {
-        provider(shipID).fetch(shipID, completion: completion)
+        starshipProvider.fetch(shipID, completion: completion)
     }
     
     var fetchProgress: (current: Int, total: Int?) = (0, nil) {
@@ -41,6 +40,7 @@ class StarshipListViewController : UITableViewController, FetchableTrait {
                 fatalError()
         }
         
+        destVC.personProvider = personProvider
         destVC.loadObjects(starship.pilotIDs)
     }
 }

SampleApp/Tests/SWAPIPersonProviderTests.swift

@@ -23,9 +23,9 @@ class SWAPIPersonProviderTests: XCTestCase {
     
     func testFetchPersonIDs() {
         let mock = NetworkMock(json: ["results": [fakePerson1, fakePerson2]])
-        wsDependencies.register(tag: WebService.PersonWS.tag, instance: mock as NetworkLayer)
+        wsDependencies.register(.Singleton) { mock as NetworkLayer }
         
-        let provider = SWAPIPersonProvider()
+        let provider = SWAPIPersonProvider(webService: try! wsDependencies.resolve())
         provider.fetchIDs { personIDs in
             XCTAssertNotNil(personIDs)
             XCTAssertEqual(personIDs.count, 2)
@@ -36,11 +36,10 @@ class SWAPIPersonProviderTests: XCTestCase {
     }
     
     func testFetchOnePerson() {
-        
         let mock = NetworkMock(json: fakePerson1)
-        wsDependencies.register(tag: WebService.PersonWS.tag, instance: mock as NetworkLayer)
+        wsDependencies.register(.Singleton) { mock as NetworkLayer }
         
-        let provider = SWAPIPersonProvider()
+        let provider = SWAPIPersonProvider(webService: try! wsDependencies.resolve())
         provider.fetch(1) { person in
             XCTAssertNotNil(person)
             XCTAssertEqual(person?.name, "John Doe")
@@ -58,9 +57,9 @@ class SWAPIPersonProviderTests: XCTestCase {
     func testFetchInvalidPerson() {
         let json = ["error":"whoops"]
         let mock = NetworkMock(json: json)
-        wsDependencies.register(tag: WebService.PersonWS.tag, instance: mock as NetworkLayer)
+        wsDependencies.register(.Singleton) { mock as NetworkLayer }
         
-        let provider = SWAPIPersonProvider()
+        let provider = SWAPIPersonProvider(webService: try! wsDependencies.resolve())
         provider.fetch(12) { person in
             XCTAssertNil(person)
         }

SampleApp/Tests/SWAPIStarshipProviderTests.swift

@@ -23,9 +23,9 @@ class SWAPIStarshipProviderTests: XCTestCase {
     
     func testFetchStarshipIDs() {
         let mock = NetworkMock(json: ["results": [fakeShip1, fakeShip2]])
-        wsDependencies.register(tag: WebService.StarshipWS.tag, instance: mock as NetworkLayer)
+        wsDependencies.register(.Singleton) { mock as NetworkLayer }
         
-        let provider = SWAPIStarshipProvider()
+        let provider = SWAPIStarshipProvider(webService: try! wsDependencies.resolve())
         provider.fetchIDs { shipIDs in
             XCTAssertNotNil(shipIDs)
             XCTAssertEqual(shipIDs.count, 2)
@@ -38,9 +38,9 @@ class SWAPIStarshipProviderTests: XCTestCase {
     func testFetchOneStarship() {
         
         let mock = NetworkMock(json: fakeShip1)
-        wsDependencies.register(tag: WebService.StarshipWS.tag, instance: mock as NetworkLayer)
+        wsDependencies.register(.Singleton) { mock as NetworkLayer }
         
-        let provider = SWAPIStarshipProvider()
+        let provider = SWAPIStarshipProvider(webService: try! wsDependencies.resolve())
         provider.fetch(1) { starship in
             XCTAssertNotNil(starship)
             XCTAssertEqual(starship?.name, "Falcon")
@@ -57,9 +57,9 @@ class SWAPIStarshipProviderTests: XCTestCase {
     func testFetchInvalidStarship() {
         let json = ["error":"whoops"]
         let mock = NetworkMock(json: json)
-        wsDependencies.register(tag: WebService.StarshipWS.tag, instance: mock as NetworkLayer)
+        wsDependencies.register(.Singleton) { mock as NetworkLayer }
         
-        let provider = SWAPIStarshipProvider()
+        let provider = SWAPIStarshipProvider(webService: try! wsDependencies.resolve())
         provider.fetch(12) { starship in
             XCTAssertNil(starship)
         }

Sources/AutoInjection.swift

@@ -0,0 +1,288 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+extension DependencyContainer {
+  
+  /**
+   Resolves properties of passed object wrapped with `Injected<T>` or `InjectedWeak<T>`
+   */
+  func autoInjectProperties(instance: Any) throws {
+    try Mirror(reflecting: instance).children.forEach(_resolveChild)
+  }
+  
+  private func _resolveChild(child: Mirror.Child) throws {
+    guard let injectedPropertyBox = child.value as? AutoInjectedPropertyBox else { return }
+    
+    try inContext(
+      context.tag,
+      resolvingType: injectedPropertyBox.dynamicType.wrappedType,
+      injectedInProperty: child.label)
+    {
+      do {
+        try injectedPropertyBox.resolve(self)
+      }
+      catch {
+        throw DipError.AutoInjectionFailed(label: child.label, type: injectedPropertyBox.dynamicType.wrappedType, underlyingError: error)
+      }
+    }
+  }
+  
+}
+
+/**
+ Implement this protocol if you want to use your own type to wrap auto-injected properties
+ instead of using `Injected<T>` or `InjectedWeak<T>` types.
+ 
+ **Example**:
+ 
+ ```swift
+ class MyCustomBox<T> {
+   private(set) var value: T?
+   init() {}
+ }
+ 
+ extension MyCustomBox: AutoInjectedPropertyBox {
+   static var wrappedType: Any.Type { return T.self }
+ 
+   func resolve(container: DependencyContainer) throws {
+     value = try container.resolve() as T
+   }
+ }
+ ```
+
+*/
+public protocol AutoInjectedPropertyBox: class {
+  ///The type of wrapped property.
+  static var wrappedType: Any.Type { get }
+  
+  /**
+   This method will be called by `DependencyContainer` during processing resolved instance properties.
+   In this method you should resolve an instance for wrapped property and store a reference to it.
+   
+   - parameter container: A container to be used to resolve an instance
+   
+   - note: This method is not intended to be called manually, `DependencyContainer` will call it by itself.
+   */
+  func resolve(container: DependencyContainer) throws
+}
+
+/**
+ Use this wrapper to identify _strong_ properties of the instance that should be
+ auto-injected by `DependencyContainer`. Type T can be any type.
+
+ - warning: Do not define this property as optional or container will not be able to inject it.
+            Instead define it with initial value of `Injected<T>()`.
+
+ **Example**:
+
+ ```swift
+ class ClientImp: Client {
+   var service = Injected<Service>()
+ }
+ ```
+ - seealso: `InjectedWeak`
+
+*/
+public final class Injected<T>: _InjectedPropertyBox<T>, AutoInjectedPropertyBox {
+  
+  ///The type of wrapped property.
+  public static var wrappedType: Any.Type {
+    return T.self
+  }
+
+  ///Wrapped value.
+  public private(set) var value: T? {
+    didSet {
+      if let value = value { didInject(value) }
+    }
+  }
+
+  /**
+   Creates a new wrapper for auto-injected property.
+   
+   - parameters:
+      - required: Defines if the property is required or not. 
+                  If container fails to inject required property it will als fail to resolve 
+                  the instance that defines that property. Default is `true`.
+      - tag: An optional tag to use to lookup definitions when injecting this property. Default is `nil`.
+      - didInject: block that will be called when concrete instance is injected in this property. 
+                   Similar to `didSet` property observer. Default value does nothing.
+  */
+  public convenience init(required: Bool = true, didInject: T -> () = { _ in }) {
+    self.init(value: nil, required: required, tag: nil, overrideTag: false, didInject: didInject)
+  }
+
+  public convenience init(required: Bool = true, tag: DependencyTagConvertible?, didInject: T -> () = { _ in }) {
+    self.init(value: nil, required: required, tag: tag, overrideTag: true, didInject: didInject)
+  }
+
+  private init(value: T?, required: Bool = true, tag: DependencyTagConvertible?, overrideTag: Bool, didInject: T -> ()) {
+    self.value = value
+    super.init(required: required, tag: tag, overrideTag: overrideTag, didInject: didInject)
+  }
+
+  public func resolve(container: DependencyContainer) throws {
+    let resolved: T? = try super.resolve(container)
+    value = resolved
+  }
+  
+  /// Returns a new wrapper with provided value.
+  public func setValue(value: T?) -> Injected {
+    guard (required && value != nil) || !required else {
+      fatalError("Can not set required property to nil.")
+    }
+    
+    return Injected(value: value, required: required, tag: tag, overrideTag: overrideTag, didInject: didInject)
+  }
+  
+}
+
+/**
+ Use this wrapper to identify _weak_ properties of the instance that should be
+ auto-injected by `DependencyContainer`. Type T should be a **class** type.
+ Otherwise it will cause runtime exception when container will try to resolve the property.
+ Use this wrapper to define one of two circular dependencies to avoid retain cycle.
+ 
+ - note: The only difference between `InjectedWeak` and `Injected` is that `InjectedWeak` uses 
+         _weak_ reference to store underlying value, when `Injected` uses _strong_ reference. 
+         For that reason if you resolve instance that has a _weak_ auto-injected property this property
+         will be released when `resolve` will complete.
+ 
+ Use `InjectedWeak<T>` to define one of two circular dependecies if another dependency is defined as `Injected<U>`.
+ This will prevent a retain cycle between resolved instances.
+
+ - warning: Do not define this property as optional or container will not be able to inject it.
+            Instead define it with initial value of `InjectedWeak<T>()`.
+
+ **Example**:
+ 
+ ```swift
+ class ServiceImp: Service {
+   var client = InjectedWeak<Client>()
+ }
+
+ ```
+ 
+ - seealso: `Injected`
+ 
+ */
+public final class InjectedWeak<T>: _InjectedPropertyBox<T>, AutoInjectedPropertyBox {
+
+  //Only classes (means AnyObject) can be used as `weak` properties
+  //but we can not make <T: AnyObject> because that will prevent using protocol as generic type
+  //so we just rely on user reading documentation and passing AnyObject in runtime
+  //also we will throw fatal error if type can not be casted to AnyObject during resolution.
+
+  ///The type of wrapped property.
+  public static var wrappedType: Any.Type {
+    return T.self
+  }
+
+  private weak var _value: AnyObject? = nil {
+    didSet {
+      if let value = value { didInject(value) }
+    }
+  }
+  
+  ///Wrapped value.
+  public var value: T? {
+    return _value as? T
+  }
+
+  /**
+   Creates a new wrapper for weak auto-injected property.
+   
+   - parameters:
+      - required: Defines if the property is required or not.
+                  If container fails to inject required property it will als fail to resolve
+                  the instance that defines that property. Default is `true`.
+      - tag: An optional tag to use to lookup definitions when injecting this property. Default is `nil`.
+      - didInject: block that will be called when concrete instance is injected in this property.
+                   Similar to `didSet` property observer. Default value does nothing.
+   */
+  public convenience init(required: Bool = true, didInject: T -> () = { _ in }) {
+    self.init(value: nil, required: required, tag: nil, overrideTag: false, didInject: didInject)
+  }
+
+  public convenience init(required: Bool = true, tag: DependencyTagConvertible?, didInject: T -> () = { _ in }) {
+    self.init(value: nil, required: required, tag: tag, overrideTag: true, didInject: didInject)
+  }
+
+  private init(value: T?, required: Bool = true, tag: DependencyTagConvertible?, overrideTag: Bool, didInject: T -> ()) {
+    self._value = value as? AnyObject
+    super.init(required: required, tag: tag, overrideTag: overrideTag, didInject: didInject)
+  }
+
+  public func resolve(container: DependencyContainer) throws {
+    let resolved: T? = try super.resolve(container)
+    if required && !(resolved is AnyObject) {
+      fatalError("\(T.self) can not be casted to AnyObject. InjectedWeak wrapper should be used to wrap only classes.")
+    }
+    _value = resolved as? AnyObject
+  }
+  
+  /// Returns a new wrapper with provided value.
+  public func setValue(value: T?) -> InjectedWeak {
+    let _value = value as? AnyObject
+    if value != nil && _value == nil {
+      fatalError("\(T.self) can not be casted to AnyObject. InjectedWeak wrapper should be used to wrap only classes.")
+    }
+    guard (required && _value != nil) || !required else {
+      fatalError("Can not set required property to nil.")
+    }
+
+    return InjectedWeak(value: value, required: required, tag: tag, overrideTag: overrideTag, didInject: didInject)
+  }
+
+}
+
+private class _InjectedPropertyBox<T> {
+
+  let required: Bool
+  let didInject: T -> ()
+  let tag: DependencyContainer.Tag?
+  let overrideTag: Bool
+
+  init(required: Bool = true, tag: DependencyTagConvertible?, overrideTag: Bool, didInject: T -> () = { _ in }) {
+    self.required = required
+    self.tag = tag?.dependencyTag
+    self.overrideTag = overrideTag
+    self.didInject = didInject
+  }
+
+  private func resolve(container: DependencyContainer) throws -> T? {
+    let resolved: T?
+    let tag = overrideTag ? self.tag : container.context.tag
+    if required {
+      resolved = try container.resolve(tag: tag) as T
+    }
+    else {
+      resolved = try? container.resolve(tag: tag) as T
+    }
+    return resolved
+  }
+  
+}
+
+

Sources/AutoWiring.swift

@@ -0,0 +1,136 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+protocol AutoWiringDefinition: Definition {
+  var numberOfArguments: Int? { get }
+  var autoWiringFactory: ((DependencyContainer, DependencyContainer.Tag?) throws -> Any)? { get }
+}
+
+extension AutoWiringDefinition {
+  func supportsAutoWiring() -> Bool {
+    return autoWiringFactory != nil && numberOfArguments > 0
+  }
+}
+
+extension DependencyContainer {
+  
+  /// Tries to resolve instance using auto-wire factories
+  func _autowire<T>(key: DefinitionKey) throws -> T {
+    guard key.argumentsType == Void.self else {
+      throw DipError.DefinitionNotFound(key: key)
+    }
+    
+    let tag = key.associatedTag
+    let type = key.protocolType
+    let resolved: Any?
+    do {
+      let definitions = autoWiringDefinitions(forType: type, tag: tag)
+      resolved = try _resolve(enumerating: definitions) { try _resolveKey($0, tag: tag, type: type) }
+    }
+    catch {
+      throw DipError.AutoWiringFailed(type: type, underlyingError: error)
+    }
+    
+    if let resolved = resolved as? T  {
+      return resolved
+    }
+    else {
+      throw DipError.DefinitionNotFound(key: key)
+    }
+  }
+
+  private func autoWiringDefinitions(forType type: Any.Type, tag: DependencyContainer.Tag?) -> [KeyDefinitionPair] {
+    var definitions = self.definitions.map({ (key: $0.0, definition: $0.1) })
+    
+    //filter definitions
+    definitions = definitions
+      .filter({ $0.definition.supportsAutoWiring() })
+      .sort({ $0.definition.numberOfArguments > $1.definition.numberOfArguments })
+    
+    definitions = filter(definitions, type: type, tag: tag)
+    definitions = order(definitions, byTag: tag)
+
+    return definitions
+  }
+  
+  /// Enumerates definitions one by one until one of them succeeds, otherwise returns nil
+  private func _resolve(enumerating keyDefinitionPairs: [KeyDefinitionPair], @noescape block: (DefinitionKey) throws -> Any?) throws -> Any? {
+    for (index, keyDefinitionPair) in keyDefinitionPairs.enumerate() {
+      //If the next definition matches current definition then they are ambigous
+      if let nextPair = keyDefinitionPairs[next: index], case keyDefinitionPair = nextPair {
+          throw DipError.AmbiguousDefinitions(
+            type: keyDefinitionPair.key.protocolType,
+            definitions: [keyDefinitionPair.definition, nextPair.definition]
+        )
+      }
+      
+      if let resolved = try block(keyDefinitionPair.key) {
+        return resolved
+      }
+    }
+    return nil
+  }
+  
+  private func _resolveKey(key: DefinitionKey, tag: DependencyContainer.Tag?, type: Any.Type) throws -> Any {
+    let key = key.tagged(tag ?? context.tag)
+    return try _resolveKey(key, builder: { definition in
+      try definition.autoWiringFactory!(self, tag)
+    })
+  }
+  
+}
+
+extension CollectionType where Self.Index: Comparable {
+  subscript(safe index: Index) -> Generator.Element? {
+    guard indices ~= index else { return nil }
+    return self[index]
+  }
+  subscript(next index: Index) -> Generator.Element? {
+    return self[safe: index.advancedBy(1)]
+  }
+}
+
+typealias KeyDefinitionPair = (key: DefinitionKey, definition: _Definition)
+
+/// Definitions are matched if they are registered for the same tag and thier factories accept the same number of runtime arguments.
+private func ~=(lhs: KeyDefinitionPair, rhs: KeyDefinitionPair) -> Bool {
+  guard lhs.key.protocolType == rhs.key.protocolType else { return false }
+  guard lhs.key.associatedTag == rhs.key.associatedTag else { return false }
+  guard lhs.definition.numberOfArguments == rhs.definition.numberOfArguments else { return false }
+  return true
+}
+
+func filter(definitions: [KeyDefinitionPair], type: Any.Type, tag: DependencyContainer.Tag?) -> [KeyDefinitionPair] {
+  return definitions
+    .filter({ $0.key.protocolType == type || $0.definition.doesImplements(type) })
+    .filter({ $0.key.associatedTag == tag || $0.key.associatedTag == nil })
+}
+
+func order(definitions: [KeyDefinitionPair], byTag tag: DependencyContainer.Tag?) -> [KeyDefinitionPair] {
+  return
+    //first will try to use tagged definitions
+    definitions.filter({ $0.key.associatedTag == tag }) +
+    //then will use not tagged definitions
+    definitions.filter({ $0.key.associatedTag != tag })
+}

Sources/Definition.swift

@@ -0,0 +1,331 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+///A key used to store definitons in a container.
+public struct DefinitionKey : Hashable, CustomStringConvertible {
+  public let protocolType: Any.Type
+  public let argumentsType: Any.Type
+  public private(set) var associatedTag: DependencyContainer.Tag?
+  
+  init(protocolType: Any.Type, argumentsType: Any.Type, associatedTag: DependencyContainer.Tag? = nil) {
+    self.protocolType = protocolType
+    self.argumentsType = argumentsType
+    self.associatedTag = associatedTag
+  }
+  
+  public var hashValue: Int {
+    return "\(protocolType)-\(argumentsType)-\(associatedTag)".hashValue
+  }
+  
+  public var description: String {
+    return "type: \(protocolType), arguments: \(argumentsType), tag: \(associatedTag.desc)"
+  }
+  
+  func tagged(tag: DependencyContainer.Tag?) -> DefinitionKey {
+    var tagged = self
+    tagged.associatedTag = tag
+    return tagged
+  }
+  
+}
+
+/// Check two definition keys on equality by comparing their `protocolType`, `factoryType` and `associatedTag` properties.
+public func ==(lhs: DefinitionKey, rhs: DefinitionKey) -> Bool {
+  return
+    lhs.protocolType == rhs.protocolType &&
+      lhs.argumentsType == rhs.argumentsType &&
+      lhs.associatedTag == rhs.associatedTag
+}
+
+///Component scope defines a strategy used by the `DependencyContainer` to manage resolved instances life cycle.
+public enum ComponentScope {
+  /**
+   A new instance will be created every time it's resolved.
+   This is a default strategy. Use this strategy when you don't want instances to be shared
+   between different consumers (i.e. if it is not thread safe).
+   
+   **Example**:
+   
+   ```
+   container.register { ServiceImp() as Service }
+   container.register { 
+     ServiceConsumerImp(
+       service1: try container.resolve() as Service
+       service2: try container.resolve() as Service
+     ) as ServiceConsumer
+   }
+   let consumer = container.resolve() as ServiceConsumer
+   consumer.service1 !== consumer.service2 //true
+   
+   ```
+   */
+  case Prototype
+  
+  /**
+   Instance resolved with the same definition will be reused until topmost `resolve(tag:)` method returns.
+   When you resolve the same object graph again the container will create new instances.
+   Use this strategy if you want different object in objects graph to share the same instance.
+   
+   - warning: Make sure this component is thread safe or accessed always from the same thread.
+   
+   **Example**:
+   
+   ```
+   container.register(.ObjectGraph) { ServiceImp() as Service }
+   container.register {
+     ServiceConsumerImp(
+       service1: try container.resolve() as Service
+       service2: try container.resolve() as Service
+     ) as ServiceConsumer
+   }
+   let consumer1 = container.resolve() as ServiceConsumer
+   let consumer2 = container.resolve() as ServiceConsumer
+   consumer1.service1 === consumer1.service2 //true
+   consumer2.service1 === consumer2.service2 //true
+   consumer1.service1 !== consumer2.service1 //true
+   ```
+   */
+  case ObjectGraph
+
+  /**
+   Resolved instance will be retained by the container and always reused.
+   Do not mix this life cycle with _singleton pattern_.
+   Instance will be not shared between different containers.
+   
+   - warning: Make sure this component is thread safe or accessed always from the same thread.
+   
+   - note: When you override or remove definition from the container an instance 
+           that was resolved with this definition will be released. When you reset 
+           the container it will release all singleton instances.
+   
+   **Example**:
+   
+   ```
+   container.register(.Singleton) { ServiceImp() as Service }
+   container.register {
+     ServiceConsumerImp(
+       service1: try container.resolve() as Service
+       service2: try container.resolve() as Service
+     ) as ServiceConsumer
+   }
+   let consumer1 = container.resolve() as ServiceConsumer
+   let consumer2 = container.resolve() as ServiceConsumer
+   consumer1.service1 === consumer1.service2 //true
+   consumer2.service1 === consumer2.service2 //true
+   consumer1.service1 === consumer2.service1 //true
+   ```
+   */
+  case Singleton
+  
+  /**
+   The same scope as `Singleton`, but instance will be created when container is bootstrapped.
+   
+   - seealso: `bootstrap()`
+  */
+  case EagerSingleton
+}
+
+///Dummy protocol to store definitions for different types in collection
+public protocol Definition: class { }
+
+/**
+ `DefinitionOf<T, F>` describes how instances of type `T` should be created when this type is resolved by the `DependencyContainer`.
+ 
+ - `T` is the type of the instance to resolve
+ - `F` is the type of the factory that will create an instance of T.
+ 
+ For example `DefinitionOf<Service, (String) -> Service>` is the type of definition that will create an instance of type `Service` using factory that accepts `String` argument.
+*/
+public final class DefinitionOf<T, F>: Definition {
+  
+  init(scope: ComponentScope, factory: F) {
+    self.factory = factory
+    self.scope = scope
+  }
+  
+  //MARK: - _Definition
+
+  let factory: F
+  let scope: ComponentScope
+  private(set) var weakFactory: (Any throws -> Any)!
+  private(set) var resolveDependenciesBlock: ((DependencyContainer, Any) throws -> ())?
+  
+  /**
+   Set the block that will be used to resolve dependencies of the instance.
+   This block will be called before `resolve(tag:)` returns.
+   
+   - parameter block: The block to use to resolve dependencies of the instance.
+   
+   - returns: modified definition
+   
+   - note: To resolve circular dependencies at least one of them should use this block
+           to resolve its dependencies. Otherwise the application will enter an infinite loop and crash.
+   
+   - note: You can call this method several times on the same definition. 
+           Container will call all provided blocks in the same order.
+   
+   **Example**
+   
+   ```swift
+   container.register { ClientImp(service: try container.resolve() as Service) as Client }
+   
+   container.register { ServiceImp() as Service }
+     .resolveDependencies { container, service in
+       service.client = try container.resolve() as Client
+     }
+   ```
+   
+   */
+  public func resolveDependencies(block: (DependencyContainer, T) throws -> ()) -> DefinitionOf {
+    let oldBlock = self.resolveDependenciesBlock
+    self.resolveDependenciesBlock = {
+      try oldBlock?($0, $1 as! T)
+      try block($0, $1 as! T)
+    }
+    return self
+  }
+  
+  /// Calls `resolveDependencies` block if it was set.
+  func resolveDependenciesOf(resolvedInstance: Any, withContainer container: DependencyContainer) throws {
+    guard let resolvedInstance = resolvedInstance as? T else { return }
+    if let resolveDependenciesBlock = self.resolveDependenciesBlock {
+      try resolveDependenciesBlock(container, resolvedInstance)
+    }
+  }
+  
+  //MARK: - AutoWiringDefinition
+  
+  private(set) var autoWiringFactory: ((DependencyContainer, DependencyContainer.Tag?) throws -> Any)?
+  private(set) var numberOfArguments: Int?
+  
+  //MARK: - TypeForwardingDefinition
+  
+  /// Types that can be resolved using this definition.
+  private(set) var implementingTypes: [Any.Type] = [(T?).self, (T!).self]
+  
+  /// Return `true` if type can be resolved using this definition
+  func doesImplements(type: Any.Type) -> Bool {
+    return implementingTypes.contains({ $0 == type })
+  }
+  
+  //MARK: - _TypeForwardingDefinition
+
+  /// Adds type as being able to be resolved using this definition
+  private func implements(type: Any.Type) {
+    implements([type])
+  }
+  
+  /// Adds types as being able to be resolved using this definition
+  private func implements(types: [Any.Type]) {
+    implementingTypes.appendContentsOf(types.filter({ !doesImplements($0) }))
+  }
+
+  /// Definition to which resolution will be forwarded to
+  private weak var forwardsToDefinition: _TypeForwardingDefinition? {
+    didSet {
+      if let forwardsToDefinition = forwardsToDefinition {
+        implements(forwardsToDefinition.type)
+        implements(forwardsToDefinition.implementingTypes)
+        
+        for definition in [forwardsToDefinition] + forwardsToDefinition.forwardsFromDefinitions {
+          definition.implements(type)
+          definition.implements(implementingTypes)
+        }
+        forwardsToDefinition.forwardsFromDefinitions.append(self)
+        resolveDependencies({ try forwardsToDefinition.resolveDependenciesOf($1, withContainer: $0) })
+      }
+    }
+  }
+  
+  /// Definitions that will forward resolution to this definition
+  private var forwardsFromDefinitions: [_TypeForwardingDefinition] = []
+  
+}
+
+//MARK: - _Definition
+
+protocol _Definition: Definition, AutoWiringDefinition, TypeForwardingDefinition {
+  var type: Any.Type { get }
+  var scope: ComponentScope { get }
+  var weakFactory: (Any throws -> Any)! { get }
+  func resolveDependenciesOf(resolvedInstance: Any, withContainer container: DependencyContainer) throws
+}
+
+//MARK: - Type Forwarding
+
+private protocol _TypeForwardingDefinition: TypeForwardingDefinition, _Definition {
+  weak var forwardsToDefinition: _TypeForwardingDefinition? { get set }
+  var forwardsFromDefinitions: [_TypeForwardingDefinition] { get set }
+  func implements(type: Any.Type)
+  func implements(type: [Any.Type])
+}
+
+extension DefinitionOf: _TypeForwardingDefinition {
+  var type: Any.Type {
+    return T.self
+  }
+}
+
+extension DefinitionOf: CustomStringConvertible {
+  public var description: String {
+    return "type: \(T.self), factory: \(F.self), scope: \(scope)"
+  }
+}
+
+//MARK: - Definition Builder
+
+/// Internal class used to build definition
+/// Need this builder as alternative to changing to DefinitionOf<T, U> where U - type of arguments
+class DefinitionBuilder<T, U> {
+  typealias F = U throws -> T
+  
+  var scope: ComponentScope!
+  var factory: F!
+  
+  var numberOfArguments: Int?
+  var autoWiringFactory: ((DependencyContainer, DependencyContainer.Tag?) throws -> T)?
+  
+  var forwardsDefinition: _Definition?
+  
+  init(@noescape configure: (DefinitionBuilder -> ())) {
+    configure(self)
+  }
+  
+  func build() -> DefinitionOf<T, F> {
+    let factory = self.factory
+    let definition = DefinitionOf<T, F>(scope: scope, factory: factory)
+    definition.numberOfArguments = numberOfArguments
+    definition.autoWiringFactory = autoWiringFactory
+    definition.weakFactory = {
+      guard let args = $0 as? U else {
+        let key = DefinitionKey(protocolType: T.self, argumentsType: U.self)
+        throw DipError.DefinitionNotFound(key: key)
+      }
+      return try factory(args)
+    }
+    definition.forwardsToDefinition = forwardsDefinition as? _TypeForwardingDefinition
+    return definition
+  }
+}
+

Sources/Dip.swift

@@ -0,0 +1,800 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+/**
+`DependencyContainer` allows you to do _Dependency Injection_
+by associating abstractions to concrete implementations.
+*/
+public final class DependencyContainer {
+  
+  /**
+   Use a tag in case you need to register multiple factories fo the same type,
+   to differentiate them. Tags can be either String or Int, to your convenience.
+   
+   - seealso: `DependencyTagConvertible`
+   */
+  public enum Tag: Equatable {
+    case String(StringLiteralType)
+    case Int(IntegerLiteralType)
+  }
+  
+  private(set) public var context: Context!
+  var definitions = [DefinitionKey : _Definition]()
+  private let resolvedInstances = ResolvedInstances()
+  private let lock = RecursiveLock()
+  
+  private(set) var bootstrapped = false
+  private var bootstrapQueue: [() throws -> ()] = []
+
+  /**
+   Designated initializer for a DependencyContainer
+   
+   - parameter configBlock: A configuration block in which you typically put all you `register` calls.
+   
+   - note: The `configBlock` is simply called at the end of the `init` to let you configure everything. 
+           It is only present for convenience to have a cleaner syntax when declaring and initializing
+           your `DependencyContainer` instances.
+   
+   - returns: A new DependencyContainer.
+   */
+  public init(@noescape configBlock: (DependencyContainer->()) = { _ in }) {
+    configBlock(self)
+  }
+  
+  /**
+   Call this method to complete container setup. After container is bootstrapped
+   you can not add or remove definitions. Trying to do so will cause runtime exception.
+   You can completely reset container, after reset you can bootstrap it again. 
+   During bootsrap container will instantiate components registered with `EagerSingleton` scope.
+   
+   - throws: `DipError` if failed to instantiate any component
+  */
+  public func bootstrap() throws {
+    try threadSafe {
+      bootstrapped = true
+      try bootstrapQueue.forEach({ try $0() })
+      bootstrapQueue.removeAll()
+    }
+  }
+  
+  private func threadSafe<T>(@noescape closure: () throws -> T) rethrows -> T {
+    lock.lock()
+    defer {
+      lock.unlock()
+    }
+    return try closure()
+  }
+  
+}
+
+extension DependencyContainer {
+  
+  /**
+   Context provides contextual information about resolution process.
+   
+   You can use the context for debugging or to pass through tag when you explicitly resolve dependencies.
+   When auto-wiring or auto-injecting tag will be implicitly passed through by the container.
+   For auto-injected properties you can disable that by providing tag (some value or `nil`) when defining property.
+   
+   **Example**:
+   
+   ```swift
+   class SomeServiceImp: SomeService {
+     //container will pass through the tag ("tag") used to resolve containing instance to resolve this property
+     let injected = Injected<SomeDependency>()
+   
+     //container will use "someTag" tag to resolve this property
+     let injectedTagged = Injected<SomeDependency>(tag: "someTag")
+   
+     //container will use `nil` tag to resolve this property
+     let injectedNilTag = Injected<SomeDependency>(tag: nil)
+   }
+   
+   container.register {
+     //container will pass through the tag ("tag") used to resolve SomeService to resolve $0
+     SomeServiceImp(dependency: $0) as SomeService
+   }.resolveDependencies { container, service in
+     //container will use `nil` tag to resolve this dependency
+     self.dependency = try container.resolve() as SomeDependency
+   
+     //container will use current context tag ("tag") to resolve this dependency
+     self.taggedDependency = try container.resolve(tag: container.context.tag) as SomeDependency
+   }
+   
+   //container will use "tag" to resolve this instance
+   let service = try! container.resolve(tag: "tag") as SomeService
+   
+   ```
+   */
+  public struct Context {
+    
+    /// The tag used to resolve currently resolving type.
+    private(set) public var tag: Tag?
+    
+    /// The type that caused currently resolving type to be resolved.
+    /// `nil` for root object in a dependencies graph.
+    private(set) public var injectedInType: Any.Type?
+    
+    /// The label of the property where resolved instance will be auto-injected.
+    private(set) public var injectedInProperty: String?
+    
+    /// Currently resolving type.
+    private(set) public var resolvingType: Any.Type
+    
+    private var depth: Int = 0
+    
+    init(tag: Tag?, injectedInType: Any.Type?, injectedInProperty: String?, resolvingType: Any.Type) {
+      self.tag = tag
+      self.injectedInType = injectedInType
+      self.injectedInProperty = injectedInProperty
+      self.resolvingType = resolvingType
+    }
+  }
+
+  /// Pushes new context created with provided values and calls block. When block returns previous context is restored.
+  /// For `nil` values (except tag) new context will use values from the current context.
+  /// Will releas resolved instances and call `Resolvable` callbacks when popped to initial context.
+  func inContext<T>(tag: Tag?, resolvingType: Any.Type? = nil, injectedInProperty: String? = nil, @noescape block: () throws -> T) throws -> T {
+    return try threadSafe {
+      let currentContext = self.context
+      
+      defer {
+        self.context = currentContext
+        
+        if self.context == nil {
+          // We call didResolveDependencies only at this point
+          // because this is a point when dependencies graph is complete.
+          for resolvedInstance in self.resolvedInstances.resolvableInstances.reverse() {
+            resolvedInstance.didResolveDependencies()
+          }
+          self.resolvedInstances.resolvedInstances.removeAll()
+          self.resolvedInstances.resolvableInstances.removeAll()
+        }
+      }
+      
+      if currentContext ==  nil {
+        self.context = Context(tag: tag, injectedInType: nil, injectedInProperty: nil, resolvingType: resolvingType ?? T.self)
+      }
+      else {
+        self.context = Context(
+          tag: tag,
+          injectedInType: currentContext.injectedInType ?? currentContext.resolvingType,
+          injectedInProperty: injectedInProperty ?? currentContext.injectedInProperty,
+          resolvingType: resolvingType ?? T.self
+        )
+        self.context.depth = currentContext.depth + 1
+      }
+      
+      return try block()
+    }
+  }
+
+}
+
+// MARK: - Registering definitions
+
+extension DependencyContainer {
+  
+  /**
+   Register factory for type `T` and associate it with an optional tag.
+
+   - parameters:
+      - tag: The arbitrary tag to associate this factory with. Pass `nil` to associate with any tag. Default value is `nil`.
+      - scope: The scope to use for instance created by the factory.
+      - factory: The factory to register.
+
+   - returns: A registered definition.
+
+   - note: You should cast the factory return type to the protocol you want to register it for
+           (unless you want to register concrete type).
+
+   **Example**:
+   ```swift
+   container.register { ServiceImp() as Service }
+   container.register(tag: "service") { ServiceImp() as Service }
+   container.register(.ObjectGraph) { ServiceImp() as Service }
+   container.register { try ClientImp(service: container.resolve() as Service) as Client }
+   ```
+   */
+  public func register<T>(tag tag: DependencyTagConvertible? = nil, _ scope: ComponentScope = .Prototype, factory: () throws -> T) -> DefinitionOf<T, () throws -> T> {
+    let definition = DefinitionBuilder<T, ()> {
+      $0.scope = scope
+      $0.factory = factory
+    }.build()
+    register(definition, forTag: tag)
+    return definition
+  }
+  
+  /**
+   Register generic factory and auto-wiring factory and associate it with an optional tag.
+   
+   - parameters:
+      - tag: The arbitrary tag to associate this factory with. Pass `nil` to associate with any tag. Default value is `nil`.
+      - scope: The scope to use for instance created by the factory.
+      - factory: The factory to register.
+      - numberOfArguments: The number of factory arguments. Will be used on auto-wiring to sort definitions.
+      - autoWiringFactory: The factory to be used on auto-wiring to resolve component.
+   
+   - returns: A registered definition.
+   
+   - note: You _should not_ call this method directly, instead call any of other `register` methods.
+   You _should_ use this method only to register dependency with more runtime arguments
+   than _Dip_ supports (currently it's up to six) like in the following example:
+   
+   ```swift
+   public func register<T, A, B, C, ...>(tag: Tag? = nil, scope: ComponentScope = .Prototype, factory: (A, B, C, ...) throws -> T) -> DefinitionOf<T, (A, B, C, ...) throws -> T> {
+     return registerFactory(tag: tag, scope: scope, factory: factory, numberOfArguments: ...) { container, tag in
+        try factory(container.resolve(tag: tag), ...)
+      }
+   }
+   ```
+   
+   Though before you do so you should probably review your design and try to reduce number of depnedencies.
+   */
+  public func registerFactory<T, U>(tag tag: DependencyTagConvertible? = nil, scope: ComponentScope, factory: U throws -> T, numberOfArguments: Int, autoWiringFactory: (DependencyContainer, Tag?) throws -> T) -> DefinitionOf<T, U throws -> T> {
+    let definition = DefinitionBuilder<T, U> {
+      $0.scope = scope
+      $0.factory = factory
+      $0.numberOfArguments = numberOfArguments
+      $0.autoWiringFactory = autoWiringFactory
+    }.build()
+    register(definition, forTag: tag)
+    return definition
+  }
+
+  /**
+   Register definiton in the container and associate it with an optional tag.
+   Will override already registered definition for the same type and factory, associated with the same tag.
+   
+   - parameters:
+      - tag: The arbitrary tag to associate this definition with. Pass `nil` to associate with any tag. Default value is `nil`.
+      - definition: The definition to register in the container.
+   
+   */
+  public func register<T, U>(definition: DefinitionOf<T, U throws -> T>, forTag tag: DependencyTagConvertible? = nil) {
+    let key = DefinitionKey(protocolType: T.self, argumentsType: U.self, associatedTag: tag?.dependencyTag)
+    register(definition, forKey: key)
+
+    if case .EagerSingleton = definition.scope {
+      bootstrapQueue.append({ let _ = try self.resolve(tag: tag) as T })
+    }
+  }
+  
+  /// Actually register definition
+  func register(definition: _Definition, forKey key: DefinitionKey) {
+    precondition(!bootstrapped, "You can not modify container's definitions after it was bootstrapped.")
+    
+    threadSafe {
+      definitions[key] = definition
+      resolvedInstances.singletons[key] = nil
+    }
+  }
+  
+}
+
+// MARK: - Resolve dependencies
+
+extension DependencyContainer {
+  
+  /**
+   Resolve a an instance of type `T`.
+   
+   If no matching definition was registered with provided `tag`,
+   container will lookup definition associated with `nil` tag.
+   
+   - parameter tag: The arbitrary tag to use to lookup definition.
+   
+   - throws: `DipError.DefinitionNotFound`, `DipError.AutoInjectionFailed`, `DipError.AmbiguousDefinitions`
+   
+   - returns: An instance of type `T`.
+   
+   - seealso: `register(tag:_:factory:)`
+   
+   **Example**:
+   ```swift
+   let service = try! container.resolve() as Service
+   let service = try! container.resolve(tag: "service") as Service
+   let service: Service = try! container.resolve()
+   ```
+   
+   */
+  public func resolve<T>(tag tag: DependencyTagConvertible? = nil) throws -> T {
+    return try resolve(tag: tag) { (factory: () throws -> T) in try factory() }
+  }
+  
+  /**
+   Resolve a an instance of provided type. Weakly-typed alternative of `resolve(tag:)`
+   
+   - warning: This method does not make any type checks, so there is no guaranty that
+              resulting instance is actually an instance of requrested type.
+              That can happen if you register forwarded type that is not implemented by resolved instance.
+   
+   **Example**:
+   ```swift
+   let service = try! container.resolve(Service.self) as! Service
+   let service = try! container.resolve(Service.self, tag: "service") as! Service
+   ```
+   
+   - seealso: `resolve(tag:)`, `register(tag:_:factory:)`, `implements(_:)`
+   */
+  public func resolve(type: Any.Type, tag: DependencyTagConvertible? = nil) throws -> Any {
+    return try self.resolve(type, tag: tag) { factory in try factory(())}
+  }
+
+  /**
+   Resolve an instance of type `T` using generic builder closure that accepts generic factory and returns created instance.
+   
+   - parameters:
+      - tag: The arbitrary tag to use to lookup definition.
+      - builder: Generic closure that accepts generic factory and returns inctance created by that factory.
+   
+   - throws: `DipError.DefinitionNotFound`, `DipError.AutoInjectionFailed`, `DipError.AmbiguousDefinitions`
+   
+   - returns: An instance of type `T`.
+   
+   - note: You _should not_ call this method directly, instead call any of other 
+           `resolve(tag:)` or `resolve(tag:withArguments:)` methods.
+           You _should_ use this method only to resolve dependency with more runtime arguments than
+           _Dip_ supports (currently it's up to six) like in the following example:
+   
+   ```swift
+   public func resolve<T, A, B, C, ...>(tag tag: Tag? = nil, _ arg1: A, _ arg2: B, _ arg3: C, ...) throws -> T {
+     return try resolve(tag: tag) { factory in factory(arg1, arg2, arg3, ...) }
+   }
+   ```
+   
+   Though before you do so you should probably review your design and try to reduce the number of dependencies.
+   */
+  public func resolve<T, U>(tag tag: DependencyTagConvertible? = nil, builder: (U throws -> T) throws -> T) throws -> T {
+    let resolved = try resolve(T.self, tag: tag, builder: { (factory: (U throws -> Any)) in
+      try builder({
+        guard let resolved = try factory($0) as? T else {
+          let key = DefinitionKey(protocolType: T.self, argumentsType: U.self, associatedTag: tag?.dependencyTag)
+          throw DipError.DefinitionNotFound(key: key)
+        }
+        return resolved
+      })
+    })
+    
+    return resolved as! T
+  }
+  
+  /**
+   Resolve an instance of provided type using builder closure. Weakly-typed alternative of `resolve(tag:builder:)`
+   
+   - seealso: `resolve(tag:builder:)`
+  */
+  public func resolve<U>(type: Any.Type, tag: DependencyTagConvertible? = nil, builder: (U throws -> Any) throws -> Any) throws -> Any {
+    return try inContext(tag?.dependencyTag, resolvingType: type) {
+      let key = DefinitionKey(protocolType: type, argumentsType: U.self, associatedTag: tag?.dependencyTag)
+      
+      return try _resolveKey(key, builder: { definition throws -> Any in
+        try builder(definition.weakFactory)
+      })
+    }
+  }
+  
+  /// Lookup definition by the key and use it to resolve instance. Fallback to the key with `nil` tag.
+  func _resolveKey<T>(key: DefinitionKey, builder: _Definition throws -> T) throws -> T {
+    guard let matching = definition(matching: key) else {
+      //if no definition found - auto-wire
+      return try _autowire(key)
+    }
+    
+    do {
+      return try _resolveDefinition(matching.definition, forKey: matching.key, builder: builder)
+    }
+      //if failed to resolve type for matching key - try auto-wiring
+      //(usually happens when inferring optional type)
+    catch let DipError.DefinitionNotFound(errorKey) where errorKey.protocolType == matching.key.protocolType {
+      return try _autowire(key)
+    }
+  }
+  
+  /// Actually resolve dependency.
+  private func _resolveDefinition<T>(definition: _Definition, forKey key: DefinitionKey, builder: _Definition throws -> T) throws -> T {
+    
+    //first search for already resolved instance for this type or any of forwarding types
+    if let previouslyResolved: T = previouslyResolved(definition, key: key) {
+      return previouslyResolved
+    }
+    
+    var resolvedInstance = try builder(definition)
+    
+    /*
+     Strongly-typed `resolve(tag:builder:)` calls weakly-typed `resolve(_:tag:builder:)`,
+     so `T` will be `Any` at runtime, erasing type information when this method returns.
+     When we try to cast result of `Any` to generic type T Swift fails to cast it.
+     The same happens in the following code snippet:
+     
+     let optService: Service? = ServiceImp()
+     let anyService: Any = optService
+     let service: Service = anyService as! Service
+     
+     As a workaround we detect boxing here and unwrap it so that we return not a box, but wrapped instance.
+     */
+    if let box = resolvedInstance as? BoxType, unboxed = box.unboxed as? T {
+      resolvedInstance = unboxed
+    }
+    
+    //when builder calls factory it will in turn resolve sub-dependencies (if there are any)
+    //when it returns instance that we try to resolve here can be already resolved
+    //so we return it, throwing away instance created by previous call to builder
+    if let previouslyResolved: T = previouslyResolved(definition, key: key) {
+      return previouslyResolved
+    }
+    
+    resolvedInstances.storeResolvedInstance(resolvedInstance, forKey: key, inScope: definition.scope)
+    
+    try definition.resolveDependenciesOf(resolvedInstance, withContainer: self)
+    try autoInjectProperties(resolvedInstance)
+    
+    return resolvedInstance
+  }
+  
+  private func previouslyResolved<T>(definition: _Definition, key: DefinitionKey) -> T? {
+    let keys = definition.implementingTypes.map({
+      DefinitionKey(protocolType: $0, argumentsType: key.argumentsType, associatedTag: key.associatedTag)
+    })
+    for key in [key] + keys {
+      if let previouslyResolved: T = resolvedInstances.previouslyResolvedInstance(forKey: key, inScope: definition.scope) {
+        return previouslyResolved
+      }
+    }
+    return nil
+  }
+  
+  /// Searches for definition that matches provided key
+  private func definition(matching key: DefinitionKey) -> KeyDefinitionPair? {
+    let typeDefinitions = definitions.filter({ $0.0.protocolType ==  key.protocolType })
+    guard !typeDefinitions.isEmpty else {
+      return typeForwardingDefinition(key.protocolType, tag: key.associatedTag)
+    }
+    
+    if let definition = (self.definitions[key] ?? self.definitions[key.tagged(nil)]) {
+      return (key, definition)
+    }
+    return nil
+  }
+  
+}
+
+// MARK: - Removing definitions
+
+extension DependencyContainer {
+  
+  /**
+   Removes definition registered in the container.
+
+   - parameters:
+      - tag: The tag used to register definition.
+      - definition: The definition to remove
+   */
+  public func remove<T, U>(definition: DefinitionOf<T, U>, forTag tag: DependencyTagConvertible? = nil) {
+    let key = DefinitionKey(protocolType: T.self, argumentsType: U.self, associatedTag: tag?.dependencyTag)
+    remove(definitionForKey: key)
+  }
+  
+  private func remove(definitionForKey key: DefinitionKey) {
+    precondition(!bootstrapped, "You can not modify container's definitions after it was bootstrapped.")
+    
+    threadSafe {
+      definitions[key] = nil
+      resolvedInstances.singletons[key] = nil
+    }
+  }
+
+  /**
+   Removes all definitions registered in the container.
+   */
+  public func reset() {
+    threadSafe {
+      definitions.removeAll()
+      resolvedInstances.singletons.removeAll()
+      bootstrapped = false
+    }
+  }
+
+}
+
+extension DependencyContainer {
+  
+  /**
+   Validates container configuration trying to resolve each registered definition one by one.
+   If definition fails to be resolved without arguments will search provided arguments array
+   for arguments matched by type and try to resolve this definition using these arguments.
+   If there are no matching arguments will rethrow original error.
+   
+   - parameter arguments: set of arguments to use to resolve registered definitions.
+                          Use a tuple for registered factories that accept several runtime arguments.
+  */
+  public func validate(arguments: Any...) throws {
+    validateNextDefinition: for (key, _) in definitions {
+      do {
+        //try to resolve key using provided arguments
+        for argumentsSet in arguments where argumentsSet.dynamicType == key.argumentsType {
+          do {
+            try inContext(key.associatedTag, resolvingType: key.protocolType) {
+              try _resolveKey(key, builder: { definition throws -> Any in
+                try definition.weakFactory(argumentsSet)
+              })
+            }
+            continue validateNextDefinition
+          }
+          catch let error as DipError {
+            throw error
+          }
+            //ignore other errors
+          catch { print(error) }
+        }
+        
+        //try to resolve key using auto-wiring
+        do {
+          try self.resolve(key.protocolType, tag: key.associatedTag)
+        }
+        catch let error as DipError {
+          throw error
+        }
+          //ignore other errors
+        catch { print(error) }
+      }
+    }
+  }
+}
+
+///Pool to hold instances, created during call to `resolve()`.
+///Before `resolve()` returns pool is drained.
+private class ResolvedInstances {
+  var resolvedInstances = [DefinitionKey: Any]()
+  var singletons = [DefinitionKey: Any]()
+  var resolvableInstances = [Resolvable]()
+  
+  func storeResolvedInstance<T>(instance: T, forKey key: DefinitionKey, inScope scope: ComponentScope) {
+    switch scope {
+    case .Singleton, .EagerSingleton: singletons[key] = instance
+    case .ObjectGraph: resolvedInstances[key] = instance
+    case .Prototype: break
+    }
+    
+    if let resolvable = instance as? Resolvable {
+      resolvableInstances.append(resolvable)
+    }
+  }
+  
+  func previouslyResolvedInstance<T>(forKey key: DefinitionKey, inScope scope: ComponentScope) -> T? {
+    switch scope {
+    case .Singleton, .EagerSingleton: return singletons[key] as? T
+    case .ObjectGraph: return resolvedInstances[key] as? T
+    case .Prototype: return nil
+    }
+  }
+  
+  private var depth: Int = 0
+  
+  func resolve<T>(@noescape block: () throws ->T) rethrows -> T {
+    depth = depth + 1
+    
+    defer {
+      depth = depth - 1
+      if depth == 0 {
+        // We call didResolveDependencies only at this point
+        // because this is a point when dependencies graph is complete.
+        for resolvedInstance in resolvableInstances.reverse() {
+          resolvedInstance.didResolveDependencies()
+        }
+        resolvedInstances.removeAll()
+        resolvableInstances.removeAll()
+      }
+    }
+    
+    let resolved = try block()
+    return resolved
+  }
+}
+
+extension DependencyContainer: CustomStringConvertible {
+  
+  public var description: String {
+    return "Definitions: \(definitions.count)\n" + definitions.map({ "\($0.0)" }).joinWithSeparator("\n")
+  }
+  
+}
+
+//MARK: - Resolvable
+
+/// Conform to this protocol when you need to have a callback when all the dependencies are injected.
+public protocol Resolvable {
+  /// This method is called by the container when all dependencies of the instance are resolved.
+  func didResolveDependencies()
+}
+
+//MARK: - DependencyTagConvertible
+
+/// Implement this protocol of your type if you want to use its instances as `DependencyContainer`'s tags.
+/// `DependencyContainer.Tag`, `String`, `Int` and any `RawRepresentable` with `RawType` of `String` or `Int` by default confrom to this protocol.
+public protocol DependencyTagConvertible {
+  var dependencyTag: DependencyContainer.Tag { get }
+}
+
+extension DependencyContainer.Tag: DependencyTagConvertible {
+  public var dependencyTag: DependencyContainer.Tag {
+    return self
+  }
+}
+
+extension String: DependencyTagConvertible {
+  public var dependencyTag: DependencyContainer.Tag {
+    return .String(self)
+  }
+}
+
+extension Int: DependencyTagConvertible {
+  public var dependencyTag: DependencyContainer.Tag {
+    return .Int(self)
+  }
+}
+
+extension DependencyTagConvertible where Self: RawRepresentable, Self.RawValue == Int {
+  public var dependencyTag: DependencyContainer.Tag {
+    return .Int(rawValue)
+  }
+}
+
+extension DependencyTagConvertible where Self: RawRepresentable, Self.RawValue == String {
+  public var dependencyTag: DependencyContainer.Tag {
+    return .String(rawValue)
+  }
+}
+
+extension DependencyContainer.Tag: StringLiteralConvertible {
+  
+  public init(stringLiteral value: StringLiteralType) {
+    self = .String(value)
+  }
+  
+  public init(unicodeScalarLiteral value: StringLiteralType) {
+    self.init(stringLiteral: value)
+  }
+  
+  public init(extendedGraphemeClusterLiteral value: StringLiteralType) {
+    self.init(stringLiteral: value)
+  }
+  
+}
+
+extension DependencyContainer.Tag: IntegerLiteralConvertible {
+  
+  public init(integerLiteral value: IntegerLiteralType) {
+    self = .Int(value)
+  }
+  
+}
+
+public func ==(lhs: DependencyContainer.Tag, rhs: DependencyContainer.Tag) -> Bool {
+  switch (lhs, rhs) {
+  case let (.String(lhsString), .String(rhsString)):
+    return lhsString == rhsString
+  case let (.Int(lhsInt), .Int(rhsInt)):
+    return lhsInt == rhsInt
+  default:
+    return false
+  }
+}
+
+//MARK: - DipError
+
+/**
+ Errors thrown by `DependencyContainer`'s methods.
+ 
+ - seealso: `resolve(tag:)`
+*/
+public enum DipError: ErrorType, CustomStringConvertible {
+  
+  /**
+   Thrown by `resolve(tag:)` if no matching definition was registered in container.
+   
+   - parameter key: definition key used to lookup matching definition
+  */
+  case DefinitionNotFound(key: DefinitionKey)
+
+  /**
+   Thrown by `resolve(tag:)` if failed to auto-inject required property.
+   
+   - parameters:
+      - label: The name of the property
+      - type: The type of the property
+      - underlyingError: The error that caused auto-injection to fail
+  */
+  case AutoInjectionFailed(label: String?, type: Any.Type, underlyingError: ErrorType)
+  
+  /**
+   Thrown by `resolve(tag:)` if failed to auto-wire a type.
+   
+   - parameters:
+      - type: The type that failed to be resolved by auto-wiring
+      - underlyingError: The error that cause auto-wiring to fail
+  */
+  case AutoWiringFailed(type: Any.Type, underlyingError: ErrorType)
+
+  /**
+   Thrown when auto-wiring type if several definitions with the same number of runtime arguments
+   are registered for that type.
+   
+   - parameters:
+      - type: The type that failed to be resolved by auto-wiring
+      - definitions: Ambiguous definitions
+  */
+  case AmbiguousDefinitions(type: Any.Type, definitions: [Definition])
+  
+  public var description: String {
+    switch self {
+    case let .DefinitionNotFound(key):
+      return "No definition registered for \(key).\nCheck the tag, type you try to resolve, number, order and types of runtime arguments passed to `resolve()` and match them with registered factories for type \(key.protocolType)."
+    case let .AutoInjectionFailed(label, type, error):
+      return "Failed to auto-inject property \"\(label.desc)\" of type \(type). \(error)"
+    case let .AutoWiringFailed(type, error):
+      return "Failed to auto-wire type \"\(type)\". \(error)"
+    case let .AmbiguousDefinitions(type, definitions):
+      return "Ambiguous definitions for \(type):\n" +
+      definitions.map({ "\($0)" }).joinWithSeparator(";\n")
+    }
+  }
+}
+
+///Internal protocol used to unwrap optional values.
+private protocol BoxType {
+  var unboxed: Any? { get }
+}
+
+extension Optional: BoxType {
+  private var unboxed: Any? {
+    switch self {
+    case let .Some(value): return value
+    default: return nil
+    }
+  }
+}
+
+extension ImplicitlyUnwrappedOptional: BoxType {
+  private var unboxed: Any? {
+    switch self {
+    case let .Some(value): return value
+    default: return nil
+    }
+  }
+}
+
+//MARK: - Deprecated methods
+
+extension DependencyContainer {
+  @available(*, deprecated=4.3.0, message="Use registerFactory(tag:scope:factory:numberOfArguments:autoWiringFactory:) instead.")
+  public func registerFactory<T, U>(tag tag: DependencyTagConvertible? = nil, scope: ComponentScope, factory: U throws -> T) -> DefinitionOf<T, U throws -> T> {
+    let definition = DefinitionBuilder<T, U> {
+      $0.scope = scope
+      $0.factory = factory
+      }.build()
+    register(definition, forTag: tag)
+    return definition
+  }
+}

Sources/RuntimeArguments.swift

@@ -0,0 +1,168 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+// MARK: - Register/resolve dependencies with runtime arguments
+
+extension DependencyContainer {
+  
+  // MARK: 1 Runtime Argument
+  
+  /**
+  Register factory that accepts one runtime argument of type `A`. You can use up to six runtime arguments.
+
+  - note: You can have several factories with different number or types of arguments registered for same type,
+          optionally associated with some tags. When container resolves that type it matches the type,
+          __number__, __types__ and __order__ of runtime arguments and optional tag that you pass to `resolve(tag:withArguments:)` method.
+
+  - parameters:
+    - tag: The arbitrary tag to associate this factory with. Pass `nil` to associate with any tag. Default value is `nil`.
+    - scope: The scope to use for this component. Default value is `.Prototype`.
+    - factory: The factory to register.
+  
+  - seealso: `registerFactory(tag:scope:factory:)`
+  */
+  public func register<T, A>(tag tag: DependencyTagConvertible? = nil, _ scope: ComponentScope = .Prototype, factory: (A) throws -> T) -> DefinitionOf<T, (A) throws -> T> {
+    return registerFactory(tag: tag, scope: scope, factory: factory, numberOfArguments: 1) { container, tag in try factory(container.resolve(tag: tag)) }
+  }
+  
+  /**
+   Resolve type `T` using one runtime argument.
+   
+   - note: When resolving a type container will first try to use definition 
+           that exactly matches types of arguments that you pass to resolve method. 
+           If it fails or no such definition is found container will try to _auto-wire_ component. 
+           For that it will iterate through all the definitions registered for that type
+           which factories accept any number of runtime arguments and are tagged with the same tag,
+           passed to `resolve` method, or with no tag. Container will try to use these definitions
+           to resolve a component one by one until one of them succeeds, starting with tagged definitions
+           in order of decreasing their's factories number of arguments. If none of them succeds it will
+           throw an error. If it finds two definitions with the same number of arguments - it will throw
+           an error.
+   
+   - parameters:
+      - tag: The arbitrary tag to lookup registered definition.
+      - arg1: The first argument to pass to the definition's factory.
+   
+   - throws: `DipError.DefinitionNotFound`, `DipError.AutoInjectionFailed`, `DipError.AmbiguousDefinitions`
+
+   - returns: An instance of type `T`.
+
+   - seealso: `register(tag:_:factory:)`, `resolve(tag:builder:)`
+   */
+  public func resolve<T, A>(tag tag: DependencyTagConvertible? = nil, withArguments arg1: A) throws -> T {
+    return try resolve(tag: tag) { factory in try factory(arg1) }
+  }
+
+  ///- seealso: `resolve(_:tag:)`, `resolve(tag:withArguments:)`
+  public func resolve<A>(type: Any.Type, tag: DependencyTagConvertible? = nil, withArguments arg1: A) throws -> Any {
+    return try resolve(type, tag: tag) { factory in try factory(arg1) }
+  }
+
+  // MARK: 2 Runtime Arguments
+  
+  /// - seealso: `register(tag:scope:factory:)`
+  public func register<T, A, B>(tag tag: DependencyTagConvertible? = nil, _ scope: ComponentScope = .Prototype, factory: (A, B) throws -> T) -> DefinitionOf<T, (A, B) throws -> T> {
+    return registerFactory(tag: tag, scope: scope, factory: factory, numberOfArguments: 2) { container, tag in try factory(container.resolve(tag: tag), container.resolve(tag: tag)) }
+  }
+  
+  /// - seealso: `resolve(tag:withArguments:)`
+  public func resolve<T, A, B>(tag tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B) throws -> T {
+    return try resolve(tag: tag) { factory in try factory(arg1, arg2) }
+  }
+  
+  ///- seealso: `resolve(_:tag:)`, `resolve(tag:withArguments:)`
+  public func resolve<A, B>(type: Any.Type, tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B) throws -> Any {
+    return try resolve(type, tag: tag) { factory in try factory((arg1, arg2)) }
+  }
+
+  // MARK: 3 Runtime Arguments
+  
+  /// - seealso: `register(tag:scope:factory:)`
+  public func register<T, A, B, C>(tag tag: DependencyTagConvertible? = nil, _ scope: ComponentScope = .Prototype, factory: (A, B, C) throws -> T) -> DefinitionOf<T, (A, B, C) throws -> T> {
+    return registerFactory(tag: tag, scope: scope, factory: factory, numberOfArguments: 3)  { container, tag in try factory(container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag)) }
+  }
+  
+  /// - seealso: `resolve(tag:withArguments:)`
+  public func resolve<T, A, B, C>(tag tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B, _ arg3: C) throws -> T {
+    return try resolve(tag: tag) { factory in try factory(arg1, arg2, arg3) }
+  }
+  
+  ///- seealso: `resolve(_:tag:)`, `resolve(tag:withArguments:)`
+  public func resolve<A, B, C>(type: Any.Type, tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B, _ arg3: C) throws -> Any {
+    return try resolve(type, tag: tag) { factory in try factory((arg1, arg2, arg3)) }
+  }
+  
+  // MARK: 4 Runtime Arguments
+  
+  /// - seealso: `register(tag:scope:factory:)`
+  public func register<T, A, B, C, D>(tag tag: DependencyTagConvertible? = nil, _ scope: ComponentScope = .Prototype, factory: (A, B, C, D) throws -> T) -> DefinitionOf<T, (A, B, C, D) throws -> T> {
+    return registerFactory(tag: tag, scope: scope, factory: factory, numberOfArguments: 4) { container, tag in try factory(container.resolve(tag: tag),  container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag)) }
+  }
+  
+  /// - seealso: `resolve(tag:withArguments:)`
+  public func resolve<T, A, B, C, D>(tag tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B, _ arg3: C, _ arg4: D) throws -> T {
+    return try resolve(tag: tag) { factory in try factory(arg1, arg2, arg3, arg4) }
+  }
+
+  /// - seealso: `resolve(_:tag:)`, `resolve(tag:withArguments:)`
+  public func resolve<A, B, C, D>(type: Any.Type, tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B, _ arg3: C, _ arg4: D) throws -> Any {
+    return try resolve(type, tag: tag) { factory in try factory((arg1, arg2, arg3, arg4)) }
+  }
+
+  // MARK: 5 Runtime Arguments
+  
+  /// - seealso: `register(tag:scope:factory:)`
+  public func register<T, A, B, C, D, E>(tag tag: DependencyTagConvertible? = nil, _ scope: ComponentScope = .Prototype, factory: (A, B, C, D, E) throws -> T) -> DefinitionOf<T, (A, B, C, D, E) throws -> T> {
+    return registerFactory(tag: tag, scope: scope, factory: factory, numberOfArguments: 5) { container, tag in try factory(container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag)) }
+  }
+  
+  /// - seealso: `resolve(tag:withArguments:)`
+  public func resolve<T, A, B, C, D, E>(tag tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B, _ arg3: C, _ arg4: D, _ arg5: E) throws -> T {
+    return try resolve(tag: tag) { factory in try factory(arg1, arg2, arg3, arg4, arg5) }
+  }
+
+  ///- seealso: `resolve(_:tag:)`, `resolve(tag:withArguments:)`
+  public func resolve<A, B, C, D, E>(type: Any.Type, tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B, _ arg3: C, _ arg4: D, _ arg5: E) throws -> Any {
+    return try resolve(type, tag: tag) { factory in try factory((arg1, arg2, arg3, arg4, arg5)) }
+  }
+
+  // MARK: 6 Runtime Arguments
+  
+  /// - seealso: `register(tag:scope:factory:)`
+  public func register<T, A, B, C, D, E, F>(tag tag: DependencyTagConvertible? = nil, _ scope: ComponentScope = .Prototype, factory: (A, B, C, D, E, F) throws -> T) -> DefinitionOf<T, (A, B, C, D, E, F) throws -> T> {
+    return registerFactory(tag: tag, scope: scope, factory: factory, numberOfArguments: 6) { container, tag in try factory(container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag), container.resolve(tag: tag)) }
+  }
+  
+  /// - seealso: `resolve(tag:withArguments:)`
+  public func resolve<T, A, B, C, D, E, F>(tag tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B, _ arg3: C, _ arg4: D, _ arg5: E, _ arg6: F) throws -> T {
+    return try resolve(tag: tag) { factory in try factory(arg1, arg2, arg3, arg4, arg5, arg6) }
+  }
+
+  /// - seealso: `resolve(_:tag:)`, `resolve(tag:withArguments:)`
+  public func resolve<A, B, C, D, E, F>(type: Any.Type, tag: DependencyTagConvertible? = nil, withArguments arg1: A, _ arg2: B, _ arg3: C, _ arg4: D, _ arg5: E, _ arg6: F) throws -> Any {
+    return try resolve(type, tag: tag) { factory in try factory((arg1, arg2, arg3, arg4, arg5, arg6)) }
+  }
+
+}
+

Sources/TypeForwarding.swift

@@ -0,0 +1,87 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+protocol TypeForwardingDefinition: Definition {
+  var implementingTypes: [Any.Type] { get }
+  func doesImplements(type: Any.Type) -> Bool
+}
+
+extension DependencyContainer {
+  
+  /**
+   Registers definition for passed type.
+   
+   If instance created by definition factory does not implement registered type
+   container will throw `DipError.DefinitionNotFound` error when trying to resolve that type.
+   
+   - parameters:
+      - definition: Definition to register
+      - type: Type to register definition for
+      - tag: Optional tag to associate definition with. Default is `nil`.
+   
+   - returns: New definition for passed type.
+   */
+  public func register<T, U, F>(definition: DefinitionOf<T, U throws -> T>, type: F.Type, tag: DependencyTagConvertible? = nil) -> DefinitionOf<F, U throws -> F> {
+    let key = DefinitionKey(protocolType: F.self, argumentsType: U.self)
+    
+    let forwardDefinition = DefinitionBuilder<F, U> {
+      $0.scope = definition.scope
+      
+      let factory = definition.factory
+      $0.factory = { [unowned self] in
+        guard let resolved = try factory($0) as? F else {
+          throw DipError.DefinitionNotFound(key: key.tagged(self.context.tag))
+        }
+        return resolved
+      }
+
+      $0.numberOfArguments = definition.numberOfArguments
+      $0.autoWiringFactory = definition.autoWiringFactory.map({ autoWiringFactory in
+        { [unowned self] in
+          guard let resolved = try autoWiringFactory($0, $1) as? F else {
+            throw DipError.DefinitionNotFound(key: key.tagged(self.context.tag))
+          }
+          return resolved
+        }
+      })
+
+      $0.forwardsDefinition = definition
+      }.build()
+    
+    register(forwardDefinition, forTag: tag)
+    return forwardDefinition
+  }
+  
+  /// Searches for definition that forwards requested type
+  func typeForwardingDefinition(type: Any.Type, tag: DependencyContainer.Tag?) -> KeyDefinitionPair? {
+    var forwardingDefinitions = self.definitions.map({ (key: $0.0, definition: $0.1) })
+    
+    forwardingDefinitions = filter(forwardingDefinitions, type: type, tag: tag)
+    forwardingDefinitions = order(forwardingDefinitions, byTag: tag)
+
+    //we need to carry on original tag
+    return forwardingDefinitions.first.map({ ($0.key.tagged(tag), $0.definition) })
+  }
+  
+}

Sources/Utils.swift

@@ -0,0 +1,84 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+extension Dictionary {
+  subscript(key: Key?) -> Value? {
+    get {
+      guard let key = key else { return nil }
+      return self[key]
+    }
+    set {
+      guard let key = key else { return }
+      self[key] = newValue
+    }
+  }
+}
+
+extension Optional {
+  var desc: String {
+    return self.map { "\($0)" } ?? "nil"
+  }
+}
+
+#if os(Linux)
+  import Glibc
+  class RecursiveLock {
+    private var _lock = _initializeRecursiveMutex()
+    
+    func lock() {
+      _lock.lock()
+    }
+    
+    func unlock() {
+      _lock.unlock()
+    }
+    
+    deinit {
+      pthread_mutex_destroy(&_lock)
+    }
+    
+  }
+  
+  private func _initializeRecursiveMutex() -> pthread_mutex_t {
+    var mutex: pthread_mutex_t = pthread_mutex_t()
+    var mta: pthread_mutexattr_t = pthread_mutexattr_t()
+    pthread_mutexattr_init(&mta)
+    pthread_mutexattr_settype(&mta, Int32(PTHREAD_MUTEX_RECURSIVE))
+    pthread_mutex_init(&mutex, &mta)
+    return mutex
+  }
+  
+  extension pthread_mutex_t {
+    mutating func lock() {
+      pthread_mutex_trylock(&self)
+    }
+    mutating func unlock() {
+      pthread_mutex_unlock(&self)
+    }
+  }
+  
+#else
+  import Foundation
+  typealias RecursiveLock = NSRecursiveLock
+#endif

Tests/Dip/AutoInjectionTests.swift

@@ -0,0 +1,348 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+@testable import Dip
+
+private protocol Server: class {
+  weak var client: Client? {get}
+  var anotherClient: Client? {get set}
+}
+
+private protocol Client: class {
+  var server: Server? {get}
+  var anotherServer: Server? {get set}
+}
+
+private class ServerImp: Server {
+  
+  var _client = InjectedWeak<Client>() { _ in
+    AutoInjectionTests.clientDidInjectCalled = true
+  }
+  var client: Client? {
+    return _client.value
+  }
+  
+  weak var anotherClient: Client?
+  
+  weak var _optionalProperty = InjectedWeak<AnyObject>(required: false)
+}
+
+private class ClientImp: Client {
+  
+  var _server = Injected<Server>() { _ in
+    AutoInjectionTests.serverDidInjectCalled = true
+  }
+  var server: Server? {
+    return _server.value
+  }
+
+  var anotherServer: Server?
+  
+  var _optionalProperty = Injected<AnyObject>(required: false)
+  
+  var taggedServer = Injected<Server>(tag: "tagged")
+  var nilTaggedServer = Injected<Server>(tag: nil)
+}
+
+private class Obj1 {
+  let obj2 = InjectedWeak<Obj2>()
+  let obj3 = Injected<Obj3>()
+}
+
+private class Obj2 {
+  let obj1 = Injected<Obj1>()
+}
+
+private class Obj3 {
+  
+  weak var obj1: Obj1?
+  
+  init(obj: Obj1) {
+    self.obj1 = obj
+  }
+}
+
+class AutoInjectionTests: XCTestCase {
+  
+  static var serverDidInjectCalled: Bool = false
+  static var clientDidInjectCalled: Bool = false
+
+  let container = DependencyContainer()
+  
+  #if os(Linux)
+  static var allTests: [(String, AutoInjectionTests -> () throws -> Void)] {
+    return [
+      ("testThatItResolvesAutoInjectedDependencies", testThatItResolvesAutoInjectedDependencies),
+      ("testThatItCanSetInjectedProperty", testThatItCanSetInjectedProperty),
+      ("testThatItThrowsErrorIfFailsToAutoInjectDependency", testThatItThrowsErrorIfFailsToAutoInjectDependency),
+      ("testThatItResolvesAutoInjectedSingletons", testThatItResolvesAutoInjectedSingletons),
+      ("testThatItCallsResolveDependencyBlockWhenAutoInjecting", testThatItCallsResolveDependencyBlockWhenAutoInjecting),
+      ("testThatItReusesResolvedAutoInjectedInstances", testThatItReusesResolvedAutoInjectedInstances),
+      ("testThatItReusesAutoInjectedInstancesOnNextResolveOrAutoInjection", testThatItReusesAutoInjectedInstancesOnNextResolveOrAutoInjection),
+      ("testThatThereIsNoRetainCycleBetweenAutoInjectedCircularDependencies", testThatThereIsNoRetainCycleBetweenAutoInjectedCircularDependencies),
+      ("testThatItCallsDidInjectOnAutoInjectedProperty", testThatItCallsDidInjectOnAutoInjectedProperty),
+      ("testThatNoErrorThrownWhenOptionalPropertiesAreNotAutoInjected", testThatNoErrorThrownWhenOptionalPropertiesAreNotAutoInjected),
+      ("testThatItResolvesTaggedAutoInjectedProperties", testThatItResolvesTaggedAutoInjectedProperties),
+      ("testThatItPassesTagToAutoInjectedProperty", testThatItPassesTagToAutoInjectedProperty),
+      ("testThatItDoesNotPassTagToAutoInjectedPropertyWithExplicitTag", testThatItDoesNotPassTagToAutoInjectedPropertyWithExplicitTag)
+    ]
+  }
+
+  func setUp() {
+    container.reset()
+  }
+  #else
+  override func setUp() {
+    container.reset()
+  }
+  #endif
+
+  func testThatItResolvesAutoInjectedDependencies() {
+    container.register(.ObjectGraph) { ServerImp() as Server }
+    container.register(.ObjectGraph) { ClientImp() as Client }
+    
+    let client = try! container.resolve() as Client
+    let server = client.server
+    XCTAssertTrue(client === server?.client)
+  }
+  
+  func testThatItCanSetInjectedProperty() {
+    container.register(.ObjectGraph) { ServerImp() as Server }
+    container.register(.ObjectGraph) { ClientImp() as Client }
+    
+    let client = (try! container.resolve() as Client) as! ClientImp
+    let server = client.server as! ServerImp
+    
+    let newServer = ServerImp()
+    let newClient = ClientImp()
+    client._server = client._server.setValue(newServer)
+    server._client = server._client.setValue(newClient)
+    
+    XCTAssertTrue(client.server === newServer)
+    XCTAssertTrue(server.client === newClient)
+  }
+  
+  func testThatItThrowsErrorIfFailsToAutoInjectDependency() {
+    container.register(.ObjectGraph) { ClientImp() as Client }
+    
+    AssertThrows(expression: try container.resolve() as Client)
+  }
+
+  func testThatItResolvesAutoInjectedSingletons() {
+    //given
+    container.register(.Singleton) { ServerImp() as Server }
+    container.register(.Singleton) { ClientImp() as Client }
+    
+    //when
+    let sharedClient = try! container.resolve() as Client
+    let sharedServer = try! container.resolve() as Server
+
+    let client = try! container.resolve() as Client
+    let server = client.server
+    
+    //then
+    XCTAssertTrue(client === sharedClient)
+    XCTAssertTrue(client === server?.client)
+    XCTAssertTrue(server === sharedServer)
+  }
+  
+  func testThatItCallsResolveDependencyBlockWhenAutoInjecting() {
+    var serverBlockWasCalled = false
+    
+    //given
+    container.register(.ObjectGraph) { ServerImp() as Server }
+      .resolveDependencies { (container, server) -> () in
+        serverBlockWasCalled = true
+    }
+
+    var clientBlockWasCalled = false
+    container.register(.ObjectGraph) { ClientImp() as Client }
+      .resolveDependencies { (container, client) -> () in
+        clientBlockWasCalled = true
+    }
+
+    //when
+    try! container.resolve() as Client
+    XCTAssertTrue(serverBlockWasCalled)
+    
+    try! container.resolve() as Server
+    XCTAssertTrue(clientBlockWasCalled)
+  }
+  
+  func testThatItReusesResolvedAutoInjectedInstances() {
+    //given
+    container.register(.ObjectGraph) { ServerImp() as Server }
+      .resolveDependencies { (container, server) -> () in
+        server.anotherClient = try! container.resolve() as Client
+    }
+
+    container.register(.ObjectGraph) { ClientImp() as Client }
+      .resolveDependencies { (container, client) -> () in
+        client.anotherServer = try! container.resolve() as Server
+    }
+
+    //when
+    let client = try! container.resolve() as Client
+    
+    //then
+    let server = client.server
+    let anotherServer = client.anotherServer
+    
+    XCTAssertTrue(server === anotherServer)
+    
+    let oneClient = server!.client
+    let anotherClient = server!.anotherClient
+    
+    XCTAssertTrue(oneClient === anotherClient)
+    XCTAssertTrue(client === anotherClient)
+  }
+  
+  func testThatItReusesAutoInjectedInstancesOnNextResolveOrAutoInjection() {
+    //given
+    container.register(.ObjectGraph) { Obj1() }
+    container.register(.ObjectGraph) { Obj2() }
+    container.register(.ObjectGraph) { Obj3(obj: try self.container.resolve()) }
+    
+    //when
+    let obj2 = try! container.resolve() as Obj2
+    
+    //then
+    XCTAssertTrue(obj2 === obj2.obj1.value!.obj2.value!,
+      "Auto-injected instance should be reused on next auto-injection")
+    
+    XCTAssertTrue(obj2.obj1.value! === obj2.obj1.value!.obj3.value!.obj1,
+      "Auto-injected instance should be reused on next resolve")
+  }
+  
+  func testThatThereIsNoRetainCycleBetweenAutoInjectedCircularDependencies() {
+    //given
+    container.register(.ObjectGraph) { ServerImp() as Server }
+    container.register(.ObjectGraph) { ClientImp() as Client }
+
+    //when
+    var client: Client? = try! container.resolve() as Client
+    
+    //then
+    weak var weakServer: Server? = client?.server
+    weak var weakClient = client
+    
+    XCTAssertNotNil(weakClient)
+    XCTAssertNotNil(weakServer)
+    
+    client = nil
+
+    XCTAssertNil(weakClient)
+    XCTAssertNil(weakServer)
+  }
+  
+  func testThatItCallsDidInjectOnAutoInjectedProperty() {
+    AutoInjectionTests.clientDidInjectCalled = false
+    AutoInjectionTests.serverDidInjectCalled = false
+    
+    //given
+    container.register(.ObjectGraph) { ServerImp() as Server }
+    container.register(.ObjectGraph) { ClientImp() as Client }
+    
+    //when
+    try! container.resolve() as Client
+    
+    //then
+    XCTAssertTrue(AutoInjectionTests.clientDidInjectCalled)
+    XCTAssertTrue(AutoInjectionTests.serverDidInjectCalled)
+  }
+  
+  func testThatNoErrorThrownWhenOptionalPropertiesAreNotAutoInjected() {
+    //given
+    container.register(.ObjectGraph) { ServerImp() as Server }
+    container.register(.ObjectGraph) { ClientImp() as Client }
+
+    AssertNoThrow(expression: try container.resolve() as Client, "Container should not throw error if failed to resolve optional auto-injected properties.")
+  }
+  
+  func testThatItResolvesTaggedAutoInjectedProperties() {
+    //given
+    container.register(.ObjectGraph) { ServerImp() as Server }
+    container.register(tag: "tagged", .ObjectGraph) { ServerImp() as Server }
+    container.register(.ObjectGraph) { ClientImp() as Client }
+    
+    //when
+    let client = try! container.resolve() as Client
+    
+    //then
+    let taggedServer = (client as! ClientImp).taggedServer.value!
+    let server = client.server!
+    
+    //server and tagged server should be resolved as different instances
+    XCTAssertTrue(server !== taggedServer)
+    XCTAssertNotNil(server)
+    XCTAssertNotNil(taggedServer)
+  }
+  
+  func testThatItPassesTagToAutoInjectedProperty() {
+    //given
+    container.register(.ObjectGraph) { ServerImp() as Server }
+    container.register(tag: "tagged", .ObjectGraph) { ServerImp() as Server }
+    container.register(.ObjectGraph) { ClientImp() as Client }
+    
+    //when
+    let client = try! container.resolve(tag: "tagged") as Client
+    
+    //then
+    let taggedServer = (client as! ClientImp).taggedServer.value!
+    let server = client.server!
+    
+    //server and tagged server should be resolved as the same instance
+    XCTAssertTrue(server === taggedServer)
+  }
+  
+  func testThatItDoesNotPassTagToAutoInjectedPropertyWithExplicitTag() {
+    //given
+    container.register(.ObjectGraph) { ServerImp() as Server }
+    container.register(tag: "tagged", .ObjectGraph) { ServerImp() as Server }
+
+    container.register(.ObjectGraph) { ClientImp() as Client }
+      .resolveDependencies { (container, client) -> () in
+        client.anotherServer = try! container.resolve() as Server
+    }
+
+    //when
+    let client = try! container.resolve(tag: "otherTag") as Client
+    
+    //then
+    let taggedServer = (client as! ClientImp).taggedServer.value!
+    let nilTaggedServer = (client as! ClientImp).nilTaggedServer.value!
+    let server = client.server!
+    
+    //server and tagged server should be resolved as different instances
+    XCTAssertTrue(server !== taggedServer)
+    XCTAssertTrue((client.anotherServer as! ServerImp) === nilTaggedServer)
+    
+    XCTAssertNotNil(server)
+    XCTAssertNotNil(taggedServer)
+    XCTAssertNotNil(nilTaggedServer)
+  }
+  
+}
+

Tests/Dip/AutoWiringTests.swift

@@ -0,0 +1,438 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+@testable import Dip
+
+private protocol Service: class { }
+private class ServiceImp1: Service { }
+private class ServiceImp2: Service { }
+private class ServiceImp3 {}
+
+private protocol AutoWiredClient: class {
+  var service1: Service! { get set }
+  var service2: Service! { get set }
+}
+
+private class AutoWiredClientImp: AutoWiredClient {
+  var service1: Service!
+  var service2: Service!
+  
+  init(service1: Service?, service2: ServiceImp2) {
+    self.service1 = service1
+    self.service2 = service2
+  }
+  init() {}
+}
+
+class AutoWiringTests: XCTestCase {
+  
+  let container = DependencyContainer()
+
+  #if os(Linux)
+  static var allTests: [(String, AutoWiringTests -> () throws -> Void)] {
+    return [
+      ("testThatItCanResolveWithAutoWiring", testThatItCanResolveWithAutoWiring),
+      ("testThatItUsesAutoWireFactoryWithMostNumberOfArguments", testThatItUsesAutoWireFactoryWithMostNumberOfArguments),
+      ("testThatItThrowsAmbiguityErrorWhenUsingAutoWire", testThatItThrowsAmbiguityErrorWhenUsingAutoWire),
+      ("testThatItFirstTriesToUseTaggedFactoriesWhenUsingAutoWire", testThatItFirstTriesToUseTaggedFactoriesWhenUsingAutoWire),
+      ("testThatItFallbackToNotTaggedFactoryWhenUsingAutoWire", testThatItFallbackToNotTaggedFactoryWhenUsingAutoWire),
+      ("testThatItDoesNotTryToUseAutoWiringWhenCallingResolveWithArguments", testThatItDoesNotTryToUseAutoWiringWhenCallingResolveWithArguments),
+      ("testThatItDoesNotUseAutoWiringWhenFailedToResolveLowLevelDependency", testThatItDoesNotUseAutoWiringWhenFailedToResolveLowLevelDependency),
+      ("testThatItReusesInstancesResolvedWithAutoWiringWhenUsingAutoWiringAgain", testThatItReusesInstancesResolvedWithAutoWiringWhenUsingAutoWiringAgain),
+      ("testThatItReusesInstancesResolvedWithAutoWiringWhenUsingAutoWiringAgainWithTheSameTag", testThatItReusesInstancesResolvedWithAutoWiringWhenUsingAutoWiringAgainWithTheSameTag),
+      ("testThatItDoesNotReuseInstancesResolvedWithAutoWiringWhenUsingAutoWiringAgainWithNoTag", testThatItDoesNotReuseInstancesResolvedWithAutoWiringWhenUsingAutoWiringAgainWithNoTag),
+      ("testThatItUsesTagToResolveDependenciesWithAutoWiringWith1Argument", testThatItUsesTagToResolveDependenciesWithAutoWiringWith1Argument),
+      ("testThatItUsesTagToResolveDependenciesWithAutoWiringWith2Arguments", testThatItUsesTagToResolveDependenciesWithAutoWiringWith2Arguments),
+      ("testThatItUsesTagToResolveDependenciesWithAutoWiringWith3Arguments", testThatItUsesTagToResolveDependenciesWithAutoWiringWith3Arguments),
+      ("testThatItUsesTagToResolveDependenciesWithAutoWiringWith4Arguments", testThatItUsesTagToResolveDependenciesWithAutoWiringWith4Arguments),
+      ("testThatItUsesTagToResolveDependenciesWithAutoWiringWith5Arguments", testThatItUsesTagToResolveDependenciesWithAutoWiringWith5Arguments),
+      ("testThatItUsesTagToResolveDependenciesWithAutoWiringWith6Arguments", testThatItUsesTagToResolveDependenciesWithAutoWiringWith6Arguments),
+      ("testThatItCanAutoWireOptional", testThatItCanAutoWireOptional)
+    ]
+  }
+
+  func setUp() {
+    container.reset()
+  }
+  #else
+  override func setUp() {
+    container.reset()
+  }
+  #endif
+
+  func testThatItCanResolveWithAutoWiring() {
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }
+    
+    //when
+    let client = try! container.resolve() as AutoWiredClient
+    
+    //then
+    let service1 = client.service1
+    XCTAssertTrue(service1 is ServiceImp1)
+    let service2 = client.service2
+    XCTAssertTrue(service2 is ServiceImp2)
+    
+    //when
+    let anyClient = try! container.resolve(AutoWiredClient.self)
+    
+    //then
+    XCTAssertTrue(anyClient is AutoWiredClientImp)
+  }
+  
+  func testThatItUsesAutoWireFactoryWithMostNumberOfArguments() {
+    //given
+    
+    //1 arg
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: try self.container.resolve()) as AutoWiredClient }
+    //1 arg
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: try self.container.resolve(), service2: $0) as AutoWiredClient }
+    
+    //2 args
+    var factoryWithMostNumberOfArgumentsCalled = false
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }
+      .resolveDependencies { _ in
+        factoryWithMostNumberOfArgumentsCalled = true
+    }
+    
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    //when
+    let _ = try! container.resolve() as AutoWiredClient
+    
+    //then
+    XCTAssertTrue(factoryWithMostNumberOfArgumentsCalled)
+  }
+  
+  func testThatItThrowsAmbiguityErrorWhenUsingAutoWire() {
+    //given
+    
+    //1 arg
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: try self.container.resolve()) as AutoWiredClient }
+    //1 arg
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: try self.container.resolve(), service2: $0) as AutoWiredClient }
+    
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    //when
+    AssertThrows(expression: try container.resolve() as AutoWiredClient) { error -> Bool in
+      switch error {
+      case let DipError.AutoWiringFailed(_, error):
+        if case DipError.AmbiguousDefinitions = error { return true }
+        else { return false }
+      default: return false
+      }
+    }
+  }
+  
+  func testThatItFirstTriesToUseTaggedFactoriesWhenUsingAutoWire() {
+    //given
+    
+    //1 arg
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: try self.container.resolve()) as AutoWiredClient }
+    //1 arg
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: try self.container.resolve(), service2: $0) as AutoWiredClient }
+    
+    //2 args
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }
+    
+    //1 arg tagged
+    var taggedFactoryWithMostNumberOfArgumentsCalled = false
+    container.register(tag: "tag", .ObjectGraph) { AutoWiredClientImp(service1: $0, service2: try self.container.resolve()) as AutoWiredClient }
+    
+    //2 arg tagged
+    container.register(tag: "tag", .ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }.resolveDependencies { _ in
+      taggedFactoryWithMostNumberOfArgumentsCalled = true
+    }
+
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    //when
+    let _ = try! container.resolve(tag: "tag") as AutoWiredClient
+    
+    //then
+    XCTAssertTrue(taggedFactoryWithMostNumberOfArgumentsCalled)
+  }
+  
+  func testThatItFallbackToNotTaggedFactoryWhenUsingAutoWire() {
+    //given
+    
+    //1 arg
+    var notTaggedFactoryWithMostNumberOfArgumentsCalled = false
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: try self.container.resolve()) as AutoWiredClient }.resolveDependencies {_ in
+      notTaggedFactoryWithMostNumberOfArgumentsCalled = true
+    }
+    
+    //1 arg tagged
+    container.register(tag: "tag", .ObjectGraph) { AutoWiredClientImp(service1: $0, service2: try self.container.resolve()) as AutoWiredClient }
+    
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    //when
+    let _ = try! container.resolve(tag: "other tag") as AutoWiredClient
+    
+    //then
+    XCTAssertTrue(notTaggedFactoryWithMostNumberOfArgumentsCalled)
+  }
+  
+  func testThatItDoesNotTryToUseAutoWiringWhenCallingResolveWithArguments() {
+    //given
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    //when
+    let service = try! container.resolve() as Service
+    AssertThrows(expression: try container.resolve(withArguments: service) as AutoWiredClient,
+      "Container should not use auto-wiring when resolving with runtime arguments")
+  }
+  
+  func testThatItDoesNotUseAutoWiringWhenFailedToResolveLowLevelDependency() {
+    //given
+    container.register(.ObjectGraph) { AutoWiredClientImp() as AutoWiredClient }
+      .resolveDependencies { container, resolved in
+        resolved.service1 = try container.resolve() as Service
+        resolved.service2 = try container.resolve() as ServiceImp2
+        
+        //simulate that something goes wrong on the way
+        throw DipError.DefinitionNotFound(key: DefinitionKey(protocolType: ServiceImp1.self, argumentsType: Any.self))
+    }
+    
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }
+      .resolveDependencies { container, resolved in
+        //auto-wiring should be performed only when definition for type to resolve is not found
+        //but not for any other type along the way in the graph
+        XCTFail("Auto-wiring should not be performed if instance was actually resolved.")
+    }
+    
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    //then
+    AssertThrows(expression: try container.resolve() as AutoWiredClient,
+      "Container should not use auto-wiring when definition for resolved type is registered.")
+  }
+  
+  func testThatItReusesInstancesResolvedWithAutoWiringWhenUsingAutoWiringAgain() {
+    
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    var anotherInstance: AutoWiredClient?
+    
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }
+      .resolveDependencies { container, _ in
+        if anotherInstance == nil {
+          anotherInstance = try! container.resolve() as AutoWiredClient
+        }
+    }
+    
+    //when
+    let resolved = try! container.resolve() as AutoWiredClient
+    
+    //then
+    //when doing another auto-wiring during resolve we should reuse instance
+    XCTAssertTrue((resolved as! AutoWiredClientImp) === (anotherInstance as! AutoWiredClientImp))
+  }
+  
+  func testThatItReusesInstancesResolvedWithAutoWiringWhenUsingAutoWiringAgainWithTheSameTag() {
+    
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    var anotherInstance: AutoWiredClient?
+    
+    container.register(tag: "tag", .ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }
+      .resolveDependencies { container, _ in
+        if anotherInstance == nil {
+          anotherInstance = try! container.resolve(tag: "tag") as AutoWiredClient
+        }
+    }
+    
+    //when
+    let resolved = try! container.resolve(tag: "tag") as AutoWiredClient
+    
+    //then
+    //when doing another auto-wiring during resolve we should reuse instance
+    XCTAssertTrue((resolved as! AutoWiredClientImp) === (anotherInstance as! AutoWiredClientImp))
+  }
+  
+  func testThatItDoesNotReuseInstancesResolvedWithAutoWiringWhenUsingAutoWiringAgainWithNoTag() {
+    
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    
+    var anotherInstance: AutoWiredClient?
+    
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }
+      .resolveDependencies { container, _ in
+        if anotherInstance == nil {
+          anotherInstance = try! container.resolve() as AutoWiredClient
+        }
+    }
+    
+    //when
+    let resolved = try! container.resolve(tag: "tag") as AutoWiredClient
+    
+    //then
+    //when doing another auto-wiring during resolve we should reuse instance
+    XCTAssertTrue((resolved as! AutoWiredClientImp) !== (anotherInstance as! AutoWiredClientImp))
+  }
+  
+  func testThatItUsesTagToResolveDependenciesWithAutoWiringWith1Argument() {
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(tag: "tag", .ObjectGraph) { ServiceImp2() as Service }
+    
+    container.register(.ObjectGraph) { (dep1: Service) -> ServiceImp3 in
+      XCTAssertTrue(dep1 is ServiceImp2)
+      return ServiceImp3()
+    }
+    
+    //when
+    let _ = try! container.resolve(tag: "tag") as ServiceImp3
+  }
+
+  func testThatItUsesTagToResolveDependenciesWithAutoWiringWith2Arguments() {
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(tag: "tag", .ObjectGraph) { ServiceImp2() as Service }
+    
+    container.register(.ObjectGraph) { (dep1: Service, dep2: Service) -> ServiceImp3 in
+      XCTAssertTrue(dep1 is ServiceImp2)
+      XCTAssertTrue(dep2 is ServiceImp2)
+      return ServiceImp3()
+    }
+    
+    //when
+    let _ = try! container.resolve(tag: "tag") as ServiceImp3
+  }
+
+  func testThatItUsesTagToResolveDependenciesWithAutoWiringWith3Arguments() {
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(tag: "tag", .ObjectGraph) { ServiceImp2() as Service }
+    
+    container.register(.ObjectGraph) { (dep1: Service, dep2: Service, dep3: Service) -> ServiceImp3 in
+      XCTAssertTrue(dep1 is ServiceImp2)
+      XCTAssertTrue(dep2 is ServiceImp2)
+      XCTAssertTrue(dep3 is ServiceImp2)
+      return ServiceImp3()
+    }
+    
+    //when
+    let _ = try! container.resolve(tag: "tag") as ServiceImp3
+  }
+
+  func testThatItUsesTagToResolveDependenciesWithAutoWiringWith4Arguments() {
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(tag: "tag", .ObjectGraph) { ServiceImp2() as Service }
+    
+    container.register(.ObjectGraph) { (dep1: Service, dep2: Service, dep3: Service, dep4: Service) -> ServiceImp3 in
+      XCTAssertTrue(dep1 is ServiceImp2)
+      XCTAssertTrue(dep2 is ServiceImp2)
+      XCTAssertTrue(dep3 is ServiceImp2)
+      XCTAssertTrue(dep4 is ServiceImp2)
+      return ServiceImp3()
+    }
+    
+    //when
+    let _ = try! container.resolve(tag: "tag") as ServiceImp3
+  }
+
+  func testThatItUsesTagToResolveDependenciesWithAutoWiringWith5Arguments() {
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(tag: "tag", .ObjectGraph) { ServiceImp2() as Service }
+    
+    container.register(.ObjectGraph) { (dep1: Service, dep2: Service, dep3: Service, dep4: Service, dep5: Service) -> ServiceImp3 in
+      XCTAssertTrue(dep1 is ServiceImp2)
+      XCTAssertTrue(dep2 is ServiceImp2)
+      XCTAssertTrue(dep3 is ServiceImp2)
+      XCTAssertTrue(dep4 is ServiceImp2)
+      XCTAssertTrue(dep5 is ServiceImp2)
+      return ServiceImp3()
+    }
+    
+    //when
+    let _ = try! container.resolve(tag: "tag") as ServiceImp3
+  }
+
+  func testThatItUsesTagToResolveDependenciesWithAutoWiringWith6Arguments() {
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(tag: "tag", .ObjectGraph) { ServiceImp2() as Service }
+    
+    container.register(.ObjectGraph) { (dep1: Service, dep2: Service, dep3: Service, dep4: Service, dep5: Service, dep6: Service) -> ServiceImp3 in
+      XCTAssertTrue(dep1 is ServiceImp2)
+      XCTAssertTrue(dep2 is ServiceImp2)
+      XCTAssertTrue(dep3 is ServiceImp2)
+      XCTAssertTrue(dep4 is ServiceImp2)
+      XCTAssertTrue(dep5 is ServiceImp2)
+      XCTAssertTrue(dep6 is ServiceImp2)
+      return ServiceImp3()
+    }
+    
+    //when
+    let _ = try! container.resolve(tag: "tag") as ServiceImp3
+  }
+
+  func testThatItCanAutoWireOptional() {
+    //given
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+    container.register(.ObjectGraph) { ServiceImp2() }
+    container.register(.ObjectGraph) { AutoWiredClientImp(service1: $0, service2: $1) as AutoWiredClient }
+    
+    var resolved: AutoWiredClient?
+    //when
+    AssertNoThrow(expression: resolved = try container.resolve() as AutoWiredClient?)
+    XCTAssertNotNil(resolved)
+    
+    //when
+    AssertNoThrow(expression: resolved = try container.resolve() as AutoWiredClient!)
+    XCTAssertNotNil(resolved)
+
+    //when
+    AssertNoThrow(expression: resolved = try container.resolve(tag: "tag") as AutoWiredClient?)
+    XCTAssertNotNil(resolved)
+    
+    //when
+    AssertNoThrow(expression: resolved = try container.resolve(tag: "tag") as AutoWiredClient!)
+    XCTAssertNotNil(resolved)
+  }
+  
+}
+

Tests/Dip/ComponentScopeTests.swift

@@ -0,0 +1,301 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+@testable import Dip
+
+private protocol Service: class {}
+private class ServiceImp1: Service {}
+private class ServiceImp2: Service {}
+
+private class Server {
+  weak var client: Client?
+  
+  init() {}
+}
+
+private class Client {
+  var server: Server
+  
+  init(server: Server) {
+    self.server = server
+  }
+}
+
+class ComponentScopeTests: XCTestCase {
+  
+  let container = DependencyContainer()
+  
+  #if os(Linux)
+  static var allTests: [(String, ComponentScopeTests -> () throws -> Void)] {
+    return [
+      ("testThatPrototypeIsDefaultScope", testThatPrototypeIsDefaultScope),
+      ("testThatScopeCanBeChanged", testThatScopeCanBeChanged),
+      ("testThatItResolvesTypeAsNewInstanceForPrototypeScope", testThatItResolvesTypeAsNewInstanceForPrototypeScope),
+      ("testThatItReusesInstanceForSingletonScope", testThatItReusesInstanceForSingletonScope),
+      ("testThatSingletonIsNotReusedAcrossContainers", testThatSingletonIsNotReusedAcrossContainers),
+      ("testThatSingletonIsReleasedWhenDefinitionIsRemoved", testThatSingletonIsReleasedWhenDefinitionIsRemoved),
+      ("testThatSingletonIsReleasedWhenDefinitionIsOverridden", testThatSingletonIsReleasedWhenDefinitionIsOverridden),
+      ("testThatSingletonIsReleasedWhenContainerIsReset", testThatSingletonIsReleasedWhenContainerIsReset),
+      ("testThatItReusesInstanceInObjectGraphScopeDuringResolve", testThatItReusesInstanceInObjectGraphScopeDuringResolve),
+      ("testThatItDoesNotReuseInstanceInObjectGraphScopeInNextResolve", testThatItDoesNotReuseInstanceInObjectGraphScopeInNextResolve),
+      ("testThatItDoesNotReuseInstanceInObjectGraphScopeResolvedForNilTag", testThatItDoesNotReuseInstanceInObjectGraphScopeResolvedForNilTag),
+      ("testThatItReusesResolvedInstanceWhenResolvingOptional", testThatItReusesResolvedInstanceWhenResolvingOptional)
+    ]
+  }
+  
+  func setUp() {
+    container.reset()
+  }
+  #else
+  override func setUp() {
+    container.reset()
+  }
+  #endif
+  
+  func testThatPrototypeIsDefaultScope() {
+    let def = container.register { ServiceImp1() as Service }
+    XCTAssertEqual(def.scope, ComponentScope.Prototype)
+  }
+  
+  func testThatScopeCanBeChanged() {
+    let def = container.register(.Singleton) { ServiceImp1() as Service }
+    XCTAssertEqual(def.scope, ComponentScope.Singleton)
+  }
+  
+  func testThatItResolvesTypeAsNewInstanceForPrototypeScope() {
+    //given
+    container.register { ServiceImp1() as Service }
+    
+    //when
+    let service1 = try! container.resolve() as Service
+    let service2 = try! container.resolve() as Service
+    
+    //then
+    XCTAssertFalse(service1 === service2)
+  }
+  
+  func testThatItReusesInstanceForSingletonScope() {
+    func test(scope: ComponentScope) {
+      //given
+      container.register(scope) { ServiceImp1() as Service }
+      
+      //when
+      let service1 = try! container.resolve() as Service
+      let service2 = try! container.resolve() as Service
+      
+      //then
+      XCTAssertTrue(service1 === service2)
+    }
+    
+    test(.Singleton)
+    test(.EagerSingleton)
+  }
+  
+  func testThatSingletonIsNotReusedAcrossContainers() {
+    func test(scope: ComponentScope) {
+      //given
+      let def = container.register(.Singleton) { ServiceImp1() as Service }
+      let secondContainer = DependencyContainer()
+      secondContainer.register(def, forTag: nil)
+      
+      //when
+      let service1 = try! container.resolve() as Service
+      let service2 = try! secondContainer.resolve() as Service
+      
+      //then
+      XCTAssertTrue(service1 !== service2, "Singleton instances should not be reused across containers")
+    }
+    
+    test(.Singleton)
+    test(.EagerSingleton)
+  }
+  
+  func testThatSingletonIsReleasedWhenDefinitionIsRemoved() {
+    func test(scope: ComponentScope) {
+      //given
+      let def = container.register(.Singleton) { ServiceImp1() as Service }
+      let service1 = try! container.resolve() as Service
+      
+      //when
+      container.remove(def, forTag: nil)
+      container.register(def, forTag: nil)
+      
+      //then
+      let service2 = try! container.resolve() as Service
+      XCTAssertTrue(service1 !== service2, "Singleton instances should be released when definition is removed from the container")
+    }
+    
+    test(.Singleton)
+    test(.EagerSingleton)
+  }
+  
+  func testThatSingletonIsReleasedWhenDefinitionIsOverridden() {
+    func test(scope: ComponentScope) {
+      //given
+      let def = container.register(.Singleton) { ServiceImp1() as Service }
+      let service1 = try! container.resolve() as Service
+      
+      //when
+      container.register(def, forTag: nil)
+      
+      //then
+      let service2 = try! container.resolve() as Service
+      XCTAssertTrue(service1 !== service2, "Singleton instances should be released when definition is overridden")
+    }
+    
+    test(.Singleton)
+    test(.EagerSingleton)
+  }
+  
+  func testThatSingletonIsReleasedWhenContainerIsReset() {
+    func test(scope: ComponentScope) {
+      //given
+      let def = container.register(.Singleton) { ServiceImp1() as Service }
+      let service1 = try! container.resolve() as Service
+      
+      //when
+      container.reset()
+      container.register(def, forTag: nil)
+      
+      //then
+      let service2 = try! container.resolve() as Service
+      XCTAssertTrue(service1 !== service2, "Singleton instances should be released when container is reset")
+    }
+    
+    test(.Singleton)
+    test(.EagerSingleton)
+  }
+  
+  func testThatItReusesInstanceInObjectGraphScopeDuringResolve() {
+    //given
+    container.register(.ObjectGraph) { Client(server: try self.container.resolve()) as Client }
+    
+    container.register(.ObjectGraph) { Server() as Server }
+      .resolveDependencies { container, server in
+        server.client = try container.resolve() as Client
+    }
+    
+    //when
+    let client = try! container.resolve() as Client
+    
+    //then
+    let server = client.server
+    XCTAssertTrue(server.client === client)
+  }
+  
+  func testThatItDoesNotReuseInstanceInObjectGraphScopeInNextResolve() {
+    //given
+    container.register(.ObjectGraph) { Client(server: try self.container.resolve()) as Client }
+    container.register(.ObjectGraph) { Server() as Server }
+      .resolveDependencies { container, server in
+        server.client = try container.resolve() as Client
+    }
+    
+    //when
+    let client = try! container.resolve() as Client
+    let server = client.server
+    
+    let anotherClient = try! container.resolve() as Client
+    let anotherServer = anotherClient.server
+    
+    //then
+    XCTAssertFalse(server === anotherServer)
+    XCTAssertFalse(client === anotherClient)
+  }
+
+  func testThatItDoesNotReuseInstanceInObjectGraphScopeResolvedForNilTag() {
+    //given
+    var service2: Service?
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+      .resolveDependencies { (c, _) in
+        service2 = try c.resolve(tag: "service") as Service
+        
+        //then
+        
+        //when service1 is resolved using this definition due to fallback to nil tag
+        //we don't want every next resolve of service reuse it
+        XCTAssertTrue(service2 is ServiceImp2)
+    }
+    container.register(tag: "service", .ObjectGraph) { ServiceImp2() as Service}
+    
+    //when
+    let service1 = try! container.resolve(tag: "tag") as Service
+
+    //then
+    XCTAssertTrue(service1 is ServiceImp1)
+  }
+  
+  func testThatOnlyEagerSingletonIsCreatedWhenContainerIsBootsrapped() {
+    //given
+    var eagerSingletonResolved = false
+    
+    container.register(tag: "eager", .EagerSingleton) { ServiceImp1() as Service }
+      .resolveDependencies { container, service in eagerSingletonResolved = true }
+    
+    container.register(tag: "singleton", .Singleton) { ServiceImp1() as Service }
+      .resolveDependencies { container, service in XCTFail() }
+
+    container.register(tag: "prototype", .Prototype) { ServiceImp1() as Service }
+      .resolveDependencies { container, service in XCTFail() }
+
+    container.register(tag: "graph", .ObjectGraph) { ServiceImp1() as Service }
+      .resolveDependencies { container, service in XCTFail() }
+    
+    //when
+    try! container.bootstrap()
+    XCTAssertTrue(eagerSingletonResolved)
+  }
+  
+  func testThatContainerCanBeBootstrappedAgainAfterReset() {
+    try! container.bootstrap()
+    XCTAssertTrue(container.bootstrapped)
+    
+    container.reset()
+    XCTAssertFalse(container.bootstrapped)
+  }
+  
+  func testThatItReusesResolvedInstanceWhenResolvingOptional() {
+    var otherService: Service!
+    var impOtherService: Service!
+    var anyOtherService: Any!
+    var anyImpOtherService: Any!
+    
+    container.register(.ObjectGraph) { ServiceImp1() as Service }
+      .resolveDependencies { container, service in
+        otherService = try! container.resolve() as Service?
+        impOtherService = try! container.resolve() as Service!
+        anyOtherService = try! container.resolve((Service?).self)
+        anyImpOtherService = try! container.resolve((Service!).self)
+    }
+    
+    let service = try! container.resolve() as Service
+    XCTAssertTrue(otherService as! ServiceImp1 === service as! ServiceImp1)
+    XCTAssertTrue(impOtherService as! ServiceImp1 === service as! ServiceImp1)
+    XCTAssertTrue(anyOtherService as! ServiceImp1 === service as! ServiceImp1)
+    XCTAssertTrue(anyImpOtherService as! ServiceImp1 === service as! ServiceImp1)
+  }
+  
+}
+

Tests/Dip/ContextTests.swift

@@ -0,0 +1,222 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+@testable import Dip
+
+private protocol Service {}
+private class ServiceImp1: Service {
+  let injected = Injected<ServiceImp2>()
+  let injectedWeak = InjectedWeak<ServiceImp2>()
+  let taggedInjected = Injected<ServiceImp2>(tag: "injectedTag")
+  let taggedInjectedWeak = InjectedWeak<ServiceImp2>(tag: "injectedTag")
+  let injectedNilTag = Injected<ServiceImp2>(tag: nil)
+}
+private class ServiceImp2: Service {}
+
+class ContextTests: XCTestCase {
+
+  let container = DependencyContainer()
+  
+  #if os(Linux)
+  static var allTests: [(String, ContextTests -> () throws -> Void)] {
+    return [
+      ("testThatContextStoresCurrentlyResolvedType", testThatContextStoresCurrentlyResolvedType),
+      ("testThatContextStoresInjectedInType", testThatContextStoresInjectedInType),
+      ("testThatContextStoresTheTagPassedToResolve", testThatContextStoresTheTagPassedToResolve),
+      ("testThatContextStoresTheTagPassedToResolveWhenAutoInjecting", testThatContextStoresTheTagPassedToResolveWhenAutoInjecting),
+      ("testThatContextStoresTheTagPassedToResolveWhenAutoWiring", testThatContextStoresTheTagPassedToResolveWhenAutoWiring),
+      ("testThatContextDoesNotOverrideNilTagPassedToResolve", testThatContextDoesNotOverrideNilTagPassedToResolve),
+      ("testThatContextStoresNameOfAutoInjectedProperty", testThatContextStoresNameOfAutoInjectedProperty)
+    ]
+  }
+  
+  func setUp() {
+    container.reset()
+  }
+  #else
+  override func setUp() {
+    container.reset()
+    container.register { ServiceImp2() }
+  }
+  #endif
+
+  func testThatContextStoresCurrentlyResolvedType() {
+    container.register { () -> Service in
+      XCTAssertTrue(self.container.context.resolvingType == Service.self)
+      let _ = try self.container.resolve() as ServiceImp1
+      return ServiceImp1() as Service
+      }.resolveDependencies { _ in
+        XCTAssertTrue(self.container.context.resolvingType == Service.self)
+        let _ = try self.container.resolve() as ServiceImp1
+    }
+    
+    container.register { () -> ServiceImp1 in
+      XCTAssertTrue(self.container.context.resolvingType == ServiceImp1.self)
+      return ServiceImp1()
+      }.resolveDependencies { _ in
+        XCTAssertTrue(self.container.context.resolvingType == ServiceImp1.self)
+    }
+    
+    let _ = try! container.resolve() as Service
+  }
+  
+  func testThatContextStoresInjectedInType() {
+    container.register { () -> Service in
+      XCTAssertNil(self.container.context.injectedInType)
+      let _ = try self.container.resolve() as ServiceImp1
+      return ServiceImp1() as Service
+      }.resolveDependencies { _ in
+        XCTAssertNil(self.container.context.injectedInType)
+        let _ = try self.container.resolve() as ServiceImp1
+    }
+    
+    container.register { () -> ServiceImp1 in
+      XCTAssertTrue(self.container.context.injectedInType == Service.self)
+      return ServiceImp1()
+      }.resolveDependencies { _ in
+        XCTAssertTrue(self.container.context.injectedInType == Service.self)
+    }
+    
+    let _ = try! container.resolve() as Service
+  }
+
+  func testThatContextStoresTheTagPassedToResolve() {
+    container.register { () -> Service in
+      XCTAssertNotNil(self.container.context.tag)
+      XCTAssertTrue(DependencyContainer.Tag.String("tag") ~= self.container.context.tag!)
+      let _ = try self.container.resolve(tag: "otherTag") as ServiceImp1
+      return ServiceImp1() as Service
+      }.resolveDependencies { _ in
+        XCTAssertNotNil(self.container.context.tag)
+        XCTAssertTrue(DependencyContainer.Tag.String("tag") ~= self.container.context.tag!)
+        let _ = try self.container.resolve(tag: "otherTag") as ServiceImp1
+    }
+    
+    container.register { () -> ServiceImp1 in
+      XCTAssertNotNil(self.container.context.tag)
+      XCTAssertTrue(DependencyContainer.Tag.String("otherTag") ~= self.container.context.tag!)
+      return ServiceImp1()
+      }.resolveDependencies { _ in
+        XCTAssertNotNil(self.container.context.tag)
+        XCTAssertTrue(DependencyContainer.Tag.String("otherTag") ~= self.container.context.tag!)
+    }
+    
+    let _ = try! container.resolve(tag: "tag") as Service
+  }
+  
+  func testThatContextStoresTheTagPassedToResolveWhenAutoInjecting() {
+    container.register { ServiceImp1() as Service }
+    container.register { ServiceImp1() }
+    
+    container.register() { () -> ServiceImp2 in
+      if self.container.context.injectedInProperty == "injectedNilTag" {
+        XCTAssertNil(self.container.context.tag)
+      }
+      else {
+        XCTAssertNotNil(self.container.context.tag)
+        XCTAssertTrue(DependencyContainer.Tag.String("injectedTag") ~= self.container.context.tag!)
+      }
+      return ServiceImp2()
+      }.resolveDependencies { _ in
+        if self.container.context.injectedInProperty == "injectedNilTag" {
+          XCTAssertNil(self.container.context.tag)
+        }
+        else {
+          XCTAssertNotNil(self.container.context.tag)
+          XCTAssertTrue(DependencyContainer.Tag.String("injectedTag") ~= self.container.context.tag!)
+        }
+    }
+    
+    container.register(tag: "tag") { () -> ServiceImp2 in
+      XCTAssertNotNil(self.container.context.tag)
+      XCTAssertTrue(DependencyContainer.Tag.String("tag") ~= self.container.context.tag!)
+      return ServiceImp2()
+      }.resolveDependencies { _ in
+        XCTAssertNotNil(self.container.context.tag)
+        XCTAssertTrue(DependencyContainer.Tag.String("tag") ~= self.container.context.tag!)
+    }
+    
+    let _ = try! container.resolve(tag: "tag") as Service
+  }
+
+  func testThatContextStoresTheTagPassedToResolveWhenAutoWiring() {
+    container.register { (_: ServiceImp1) -> Service in
+      return ServiceImp1() as Service
+      }.resolveDependencies { _ in
+    }
+    
+    container.register { () -> ServiceImp1 in
+      XCTAssertNotNil(self.container.context.tag)
+      XCTAssertTrue(DependencyContainer.Tag.String("tag") ~= self.container.context.tag!)
+      return ServiceImp1()
+      }.resolveDependencies { _ in
+        XCTAssertNotNil(self.container.context.tag)
+        XCTAssertTrue(DependencyContainer.Tag.String("tag") ~= self.container.context.tag!)
+    }
+    
+    let _ = try! container.resolve(tag: "tag") as Service
+  }
+
+  func testThatContextDoesNotOverrideNilTagPassedToResolve() {
+    container.register { () -> Service in
+      XCTAssertNotNil(self.container.context.tag)
+      XCTAssertTrue(DependencyContainer.Tag.String("tag") ~= self.container.context.tag!)
+      let _ = try self.container.resolve() as ServiceImp1
+      return ServiceImp1() as Service
+      }.resolveDependencies { _ in
+        XCTAssertNotNil(self.container.context.tag)
+        XCTAssertTrue(DependencyContainer.Tag.String("tag") ~= self.container.context.tag!)
+        let _ = try self.container.resolve() as ServiceImp1
+    }
+    
+    container.register { () -> ServiceImp1 in
+      XCTAssertNil(self.container.context.tag)
+      return ServiceImp1()
+      }.resolveDependencies { _ in
+        XCTAssertNil(self.container.context.tag)
+    }
+    
+    let _ = try! container.resolve(tag: "tag") as Service
+  }
+  
+  func testThatContextStoresNameOfAutoInjectedProperty() {
+    container.register { ServiceImp1() as Service }
+    container.register { ServiceImp1() }
+    
+    let names = ["injected", "injectedWeak", "taggedInjected", "taggedInjectedWeak", "injectedNilTag"]
+    
+    container.register() { () -> ServiceImp2 in
+      XCTAssertNotNil(self.container.context.injectedInProperty)
+      XCTAssertTrue(names.contains(self.container.context.injectedInProperty!))
+      return ServiceImp2()
+      }.resolveDependencies { _ in
+        XCTAssertNotNil(self.container.context.injectedInProperty)
+        XCTAssertTrue(names.contains(self.container.context.injectedInProperty!))
+    }
+    
+    let _ = try! container.resolve() as Service
+  }
+  
+}

Tests/Dip/DefinitionTests.swift

@@ -0,0 +1,125 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+@testable import Dip
+
+private protocol Service {}
+private class ServiceImp: Service {}
+
+class DefinitionTests: XCTestCase {
+
+  private typealias F1 = () -> Service
+  private typealias F2 = (String) -> Service
+  
+  let tag1 = DependencyContainer.Tag.String("tag1")
+  let tag2 = DependencyContainer.Tag.String("tag2")
+  
+  #if os(Linux)
+  static var allTests: [(String, DefinitionTests -> () throws -> Void)] {
+    return [
+      ("testThatDefinitionKeyIsEqualBy_Type_Factory_Tag", testThatDefinitionKeyIsEqualBy_Type_Factory_Tag),
+      ("testThatDefinitionKeysWithDifferentTypesAreNotEqual", testThatDefinitionKeysWithDifferentTypesAreNotEqual),
+      ("testThatDefinitionKeysWithDifferentFactoriesAreNotEqual", testThatDefinitionKeysWithDifferentFactoriesAreNotEqual),
+      ("testThatDefinitionKeysWithDifferentTagsAreNotEqual", testThatDefinitionKeysWithDifferentTagsAreNotEqual),
+      ("testThatResolveDependenciesCallsResolveDependenciesBlock", testThatResolveDependenciesCallsResolveDependenciesBlock),
+      ("testThatResolveDependenciesBlockIsNotCalledWhenPassedWrongInstance", testThatResolveDependenciesBlockIsNotCalledWhenPassedWrongInstance),
+      ("testThatItRegisteresOptionalTypesAsForwardedTypes", testThatItRegisteresOptionalTypesAsForwardedTypes)
+    ]
+  }
+  #endif
+
+  func testThatDefinitionKeyIsEqualBy_Type_Factory_Tag() {
+    let equalKey1 = DefinitionKey(protocolType: Service.self, argumentsType: F1.self, associatedTag: tag1)
+    let equalKey2 = DefinitionKey(protocolType: Service.self, argumentsType: F1.self, associatedTag: tag1)
+    
+    XCTAssertEqual(equalKey1, equalKey2)
+    XCTAssertEqual(equalKey1.hashValue, equalKey2.hashValue)
+  }
+  
+  func testThatDefinitionKeysWithDifferentTypesAreNotEqual() {
+    let keyWithDifferentType1 = DefinitionKey(protocolType: Service.self, argumentsType: F1.self, associatedTag: nil)
+    let keyWithDifferentType2 = DefinitionKey(protocolType: AnyObject.self, argumentsType: F1.self, associatedTag: nil)
+    
+    XCTAssertNotEqual(keyWithDifferentType1, keyWithDifferentType2)
+    XCTAssertNotEqual(keyWithDifferentType1.hashValue, keyWithDifferentType2.hashValue)
+  }
+  
+  func testThatDefinitionKeysWithDifferentFactoriesAreNotEqual() {
+    let keyWithDifferentFactory1 = DefinitionKey(protocolType: Service.self, argumentsType: F1.self, associatedTag: nil)
+    let keyWithDifferentFactory2 = DefinitionKey(protocolType: Service.self, argumentsType: F2.self, associatedTag: nil)
+    
+    XCTAssertNotEqual(keyWithDifferentFactory1, keyWithDifferentFactory2)
+    XCTAssertNotEqual(keyWithDifferentFactory1.hashValue, keyWithDifferentFactory2.hashValue)
+  }
+  
+  func testThatDefinitionKeysWithDifferentTagsAreNotEqual() {
+    let keyWithDifferentTag1 = DefinitionKey(protocolType: Service.self, argumentsType: F1.self, associatedTag: tag1)
+    let keyWithDifferentTag2 = DefinitionKey(protocolType: Service.self, argumentsType: F1.self, associatedTag: tag2)
+    
+    XCTAssertNotEqual(keyWithDifferentTag1, keyWithDifferentTag2)
+    XCTAssertNotEqual(keyWithDifferentTag1.hashValue, keyWithDifferentTag2.hashValue)
+  }
+
+  func testThatResolveDependenciesCallsResolveDependenciesBlock() {
+    var blockCalled = false
+    
+    //given
+    let def = DefinitionOf<Service, () -> Service>(scope: .Prototype) { ServiceImp() as Service }
+      .resolveDependencies { container, service in
+        blockCalled = true
+    }
+    
+    //when
+    try! def.resolveDependenciesOf(ServiceImp(), withContainer: DependencyContainer())
+    
+    //then
+    XCTAssertTrue(blockCalled)
+  }
+  
+  func testThatResolveDependenciesBlockIsNotCalledWhenPassedWrongInstance() {
+    var blockCalled = false
+    
+    //given
+    let def = DefinitionOf<Service, () -> Service>(scope: .Prototype) { ServiceImp() as Service }
+      .resolveDependencies { container, service in
+        blockCalled = true
+    }
+    
+    //when
+    try! def.resolveDependenciesOf(String(), withContainer: DependencyContainer())
+    
+    //then
+    XCTAssertFalse(blockCalled)
+  }
+  
+  func testThatItRegisteresOptionalTypesAsForwardedTypes() {
+    let def = DefinitionOf<Service, () -> Service>(scope: .Prototype) { ServiceImp() as Service }
+    
+    XCTAssertTrue(def.implementingTypes.contains({ $0 == Service?.self }))
+    XCTAssertTrue(def.implementingTypes.contains({ $0 == Service!.self }))
+  }
+  
+}
+

Tests/Dip/DipTests.swift

@@ -0,0 +1,600 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+@testable import Dip
+
+private protocol Service: class { }
+private class ServiceImp1: Service { }
+private class ServiceImp2: Service { }
+
+private protocol Server: class {
+  weak var client: Client? { get }
+}
+private protocol Client: class {
+  var server: Server? { get }
+}
+
+class DipTests: XCTestCase {
+
+  let container = DependencyContainer()
+
+  #if os(Linux)
+  static var allTests: [(String, DipTests -> () throws -> Void)] {
+    return [
+      ("testThatItResolvesInstanceRegisteredWithoutTag", testThatItResolvesInstanceRegisteredWithoutTag),
+      ("testThatItResolvesInstanceRegisteredWithTag", testThatItResolvesInstanceRegisteredWithTag),
+      ("testThatItResolvesDifferentInstancesRegisteredForDifferentTags", testThatItResolvesDifferentInstancesRegisteredForDifferentTags),
+      ("testThatNewRegistrationOverridesPreviousRegistration", testThatNewRegistrationOverridesPreviousRegistration),
+      ("testThatItCallsResolveDependenciesOnDefinition", testThatItCallsResolveDependenciesOnDefinition),
+      ("testThatItThrowsErrorIfCanNotFindDefinitionForType", testThatItThrowsErrorIfCanNotFindDefinitionForType),
+      ("testThatItThrowsErrorIfCanNotFindDefinitionForTag", testThatItThrowsErrorIfCanNotFindDefinitionForTag),
+      ("testThatItThrowsErrorIfCanNotFindDefinitionForFactoryWithArguments", testThatItThrowsErrorIfCanNotFindDefinitionForFactoryWithArguments),
+      ("testThatItThrowsErrorIfConstructorThrows", testThatItThrowsErrorIfConstructorThrows),
+      ("testThatItThrowsErrorIfFailsToResolveDependency", testThatItThrowsErrorIfFailsToResolveDependency),
+      ("testThatItCallsDidResolveDependenciesOnResolvableIntance", testThatItCallsDidResolveDependenciesOnResolvableIntance),
+      ("testThatItCallsDidResolveDependenciesInReverseOrder", testThatItCallsDidResolveDependenciesInReverseOrder),
+      ("testThatItResolvesCircularDependencies", testThatItResolvesCircularDependencies)
+    ]
+  }
+
+  func setUp() {
+    container.reset()
+  }
+  #else
+  override func setUp() {
+    container.reset()
+  }
+  #endif
+
+  func testThatItResolvesInstanceRegisteredWithoutTag() {
+    //given
+    container.register { ServiceImp1() as Service }
+    
+    //when
+    let serviceInstance = try! container.resolve() as Service
+    
+    //then
+    XCTAssertTrue(serviceInstance is ServiceImp1)
+    
+    //and when
+    let anyService = try! container.resolve(Service.self)
+    
+    //then
+    XCTAssertTrue(anyService is ServiceImp1)
+
+    //and when
+    let optService = try! container.resolve((Service?).self)
+    
+    //then
+    XCTAssertTrue(optService is ServiceImp1)
+    
+    //and when
+    let impService = try! container.resolve((Service!).self)
+    
+    //then
+    XCTAssertTrue(impService is ServiceImp1)
+  }
+  
+  func testThatItResolvesInstanceRegisteredWithTag() {
+    //given
+    container.register(tag: "service") { ServiceImp1() as Service }
+    
+    //when
+    let serviceInstance = try! container.resolve(tag: "service") as Service
+    
+    //then
+    XCTAssertTrue(serviceInstance is ServiceImp1)
+
+    //and when
+    let anyService = try! container.resolve(Service.self, tag: "service")
+    
+    //then
+    XCTAssertTrue(anyService is ServiceImp1)
+    
+    //and when
+    let optService = try! container.resolve((Service?).self, tag: "service")
+    
+    //then
+    XCTAssertTrue(optService is ServiceImp1)
+    
+    //and when
+    let impService = try! container.resolve((Service!).self, tag: "service")
+    
+    //then
+    XCTAssertTrue(impService is ServiceImp1)
+  }
+  
+  func testThatItResolvesDifferentInstancesRegisteredForDifferentTags() {
+    //given
+    container.register(tag: "service1") { ServiceImp1() as Service }
+    container.register(tag: "service2") { ServiceImp2() as Service }
+    
+    //when
+    let service1Instance = try! container.resolve(tag: "service1") as Service
+    let service2Instance = try! container.resolve(tag: "service2") as Service
+    
+    //then
+    XCTAssertTrue(service1Instance is ServiceImp1)
+    XCTAssertTrue(service2Instance is ServiceImp2)
+    
+    //and when
+    let anyService1 = try! container.resolve(Service.self, tag: "service1")
+    let anyService2 = try! container.resolve(Service.self, tag: "service2")
+    
+    //then
+    XCTAssertTrue(anyService1 is ServiceImp1)
+    XCTAssertTrue(anyService2 is ServiceImp2)
+
+    //and when
+    let optService1 = try! container.resolve((Service?).self, tag: "service1")
+    let optService2 = try! container.resolve((Service?).self, tag: "service2")
+    
+    //then
+    XCTAssertTrue(optService1 is ServiceImp1)
+    XCTAssertTrue(optService2 is ServiceImp2)
+  
+    //and when
+    let impService1 = try! container.resolve((Service!).self, tag: "service1")
+    let impService2 = try! container.resolve((Service!).self, tag: "service2")
+    
+    //then
+    XCTAssertTrue(impService1 is ServiceImp1)
+    XCTAssertTrue(impService2 is ServiceImp2)
+  }
+  
+  func testThatNewRegistrationOverridesPreviousRegistration() {
+    //given
+    container.register { ServiceImp1() as Service }
+    let service1 = try! container.resolve() as Service
+    
+    //when
+    container.register { ServiceImp2() as Service }
+    let service2 = try! container.resolve() as Service
+    
+    //then
+    XCTAssertTrue(service1 is ServiceImp1)
+    XCTAssertTrue(service2 is ServiceImp2)
+  }
+  
+  func testThatItCallsResolveDependenciesOnDefinition() {
+    //given
+    var resolveDependenciesCalled = false
+    container.register { ServiceImp1() as Service }.resolveDependencies { (c, s) in
+      resolveDependenciesCalled = true
+    }
+    
+    //when
+    try! container.resolve() as Service
+    
+    //then
+    XCTAssertTrue(resolveDependenciesCalled)
+    resolveDependenciesCalled = false
+    
+    //and when
+    try! container.resolve(Service.self)
+    
+    //then
+    XCTAssertTrue(resolveDependenciesCalled)
+
+    resolveDependenciesCalled = false
+    
+    //and when
+    try! container.resolve((Service?).self)
+    
+    //then
+    XCTAssertTrue(resolveDependenciesCalled)
+
+    resolveDependenciesCalled = false
+    
+    //and when
+    try! container.resolve((Service!).self)
+    
+    //then
+    XCTAssertTrue(resolveDependenciesCalled)
+  }
+  
+  func testThatItThrowsErrorIfCanNotFindDefinitionForType() {
+    //given
+    container.register { ServiceImp1() as ServiceImp1 }
+    
+    //when
+    AssertThrows(expression: try container.resolve() as Service) { error in
+      guard case let DipError.DefinitionNotFound(key) = error else { return false }
+      
+      //then
+      let expectedKey = DefinitionKey(protocolType: Service.self, argumentsType: Void.self, associatedTag: nil)
+      XCTAssertEqual(key, expectedKey)
+
+      return true
+    }
+
+    //and when
+    AssertThrows(expression: try container.resolve(Service.self)) { error in
+      guard case let DipError.DefinitionNotFound(key) = error else { return false }
+      
+      //then
+      let expectedKey = DefinitionKey(protocolType: Service.self, argumentsType: Void.self, associatedTag: nil)
+      XCTAssertEqual(key, expectedKey)
+      
+      return true
+    }
+  }
+  
+  func testThatItThrowsErrorIfCanNotFindDefinitionForTag() {
+    //given
+    container.register(tag: "some tag") { ServiceImp1() as Service }
+    
+    //when
+    AssertThrows(expression: try container.resolve(tag: "other tag") as Service) { error in
+      guard case let DipError.DefinitionNotFound(key) = error else { return false }
+      
+      //then
+      let expectedKey = DefinitionKey(protocolType: Service.self, argumentsType: Void.self, associatedTag: "other tag")
+      XCTAssertEqual(key, expectedKey)
+      
+      return true
+    }
+
+    //and when
+    AssertThrows(expression: try container.resolve(Service.self, tag: "other tag")) { error in
+      guard case let DipError.DefinitionNotFound(key) = error else { return false }
+      
+      //then
+      let expectedKey = DefinitionKey(protocolType: Service.self, argumentsType: Void.self, associatedTag: "other tag")
+      XCTAssertEqual(key, expectedKey)
+      
+      return true
+    }
+  }
+  
+  func testThatItThrowsErrorIfCanNotFindDefinitionForFactoryWithArguments() {
+    //given
+    container.register { ServiceImp1() as Service }
+    
+    //when
+    AssertThrows(expression: try container.resolve(withArguments: "some string") as Service) { error in
+      guard case let DipError.DefinitionNotFound(key) = error else { return false }
+      
+      //then
+      let expectedKey = DefinitionKey(protocolType: Service.self, argumentsType: String.self, associatedTag: nil)
+      XCTAssertEqual(key, expectedKey)
+
+      return true
+    }
+
+    //and when
+    AssertThrows(expression: try container.resolve(Service.self, withArguments: "some string")) { error in
+      guard case let DipError.DefinitionNotFound(key) = error else { return false }
+      
+      //then
+      let expectedKey = DefinitionKey(protocolType: Service.self, argumentsType: String.self, associatedTag: nil)
+      XCTAssertEqual(key, expectedKey)
+      
+      return true
+    }
+  }
+  
+  func testThatItThrowsErrorIfConstructorThrows() {
+    //given
+    let failedKey = DefinitionKey(protocolType: Any.self, argumentsType: Any.self)
+    let expectedError = DipError.DefinitionNotFound(key: failedKey)
+    container.register { () throws -> Service in throw expectedError }
+    
+    //when
+    AssertThrows(expression: try container.resolve() as Service) { error in
+      switch error {
+      case let DipError.DefinitionNotFound(key) where key == failedKey: return true
+      default: return false
+      }
+    }
+    
+    //and when
+    AssertThrows(expression: try container.resolve(Service.self)) { error in
+      switch error {
+      case let DipError.DefinitionNotFound(key) where key == failedKey: return true
+      default: return false
+      }
+    }
+  }
+  
+  func testThatItThrowsErrorIfFailsToResolveDependency() {
+    //given
+    let failedKey = DefinitionKey(protocolType: Any.self, argumentsType: Any.self)
+    let expectedError = DipError.DefinitionNotFound(key: failedKey)
+    container.register { ServiceImp1() as Service }
+      .resolveDependencies { container, service in
+        //simulate throwing error when resolving dependency
+        throw expectedError
+    }
+    
+    //when
+    AssertThrows(expression: try container.resolve() as Service) { error in
+      switch error {
+      case let DipError.DefinitionNotFound(key) where key == failedKey: return true
+      default: return false
+      }
+    }
+    
+    //and when
+    AssertThrows(expression: try container.resolve(Service.self)) { error in
+      switch error {
+      case let DipError.DefinitionNotFound(key) where key == failedKey: return true
+      default: return false
+      }
+    }
+  }
+
+  func testThatItCallsDidResolveDependenciesOnResolvableIntance() {
+    
+    class ResolvableService: Service, Resolvable {
+      var didResolveDependenciesCalled = false
+      
+      func didResolveDependencies() {
+        XCTAssertFalse(didResolveDependenciesCalled, "didResolveDependencies should be called only once per instance")
+        didResolveDependenciesCalled = true
+      }
+    }
+    
+    //given
+    container.register { ResolvableService() as Service }
+      .resolveDependencies { _, service in
+        XCTAssertFalse((service as! ResolvableService).didResolveDependenciesCalled, "didResolveDependencies should not be called yet")
+        return
+    }
+
+    container.register(tag: "graph", .ObjectGraph) { ResolvableService() as Service }
+      .resolveDependencies { _, service in
+        XCTAssertFalse((service as! ResolvableService).didResolveDependenciesCalled, "didResolveDependencies should not be called yet")
+        return
+    }
+
+    container.register(tag: "singleton", .Singleton) { ResolvableService() as Service }
+      .resolveDependencies { _, service in
+        XCTAssertFalse((service as! ResolvableService).didResolveDependenciesCalled, "didResolveDependencies should not be called yet")
+        return
+    }
+
+    //when
+    let service = try! container.resolve() as Service
+    
+    //then
+    XCTAssertTrue((service as! ResolvableService).didResolveDependenciesCalled)
+
+    //and when
+    let graphService = try! container.resolve(tag: "graph") as Service
+    
+    //then
+    XCTAssertTrue((graphService as! ResolvableService).didResolveDependenciesCalled)
+    
+    //and when
+    let singletonService = try! container.resolve(tag: "singleton") as Service
+    let _ = try! container.resolve(tag: "singleton") as Service
+    
+    //then
+    XCTAssertTrue((singletonService as! ResolvableService).didResolveDependenciesCalled)
+  }
+  
+  func testThatItCallsDidResolveDependenciesInReverseOrder() {
+    
+    class ResolvableService: Service, Resolvable {
+      static var resolved: [Service] = []
+      
+      func didResolveDependencies() {
+        ResolvableService.resolved.append(self)
+      }
+    }
+    
+    //given
+    var resolveDependenciesCalled = false
+    var service2: Service!
+    container.register { ResolvableService() as Service }
+      .resolveDependencies { _, service in
+        if !resolveDependenciesCalled {
+          resolveDependenciesCalled = true
+          service2 = try self.container.resolve() as Service
+        }
+        return
+    }
+
+    //when
+    let service1 = try! container.resolve() as Service
+    
+    //then
+    XCTAssertTrue(ResolvableService.resolved.first === service2)
+    XCTAssertTrue(ResolvableService.resolved.last === service1)
+  }
+  
+  func testThatItResolvesCircularDependencies() {
+    
+    class ResolvableServer: Server, Resolvable {
+      weak var client: Client?
+      weak var secondClient: Client?
+      
+      init(client: Client) {
+        self.client = client
+      }
+      
+      var didResolveDependenciesCalled = false
+      
+      func didResolveDependencies() {
+        XCTAssertFalse(didResolveDependenciesCalled, "didResolveDependencies should be called only once per instance")
+        didResolveDependenciesCalled = true
+
+        XCTAssertNotNil(self.client)
+        XCTAssertNotNil(self.secondClient)
+        XCTAssertNotNil(self.client?.server)
+        XCTAssertNotNil(self.secondClient)
+        XCTAssertNotNil(self.secondClient?.server)
+      }
+      
+    }
+    
+    class ResolvableClient: Client, Resolvable {
+      var server: Server?
+      var secondServer: Server?
+      
+      init() {}
+      
+      var didResolveDependenciesCalled = false
+      
+      func didResolveDependencies() {
+        XCTAssertFalse(didResolveDependenciesCalled, "didResolveDependencies should be called only once per instance")
+        didResolveDependenciesCalled = true
+
+        XCTAssertNotNil(self.server)
+        XCTAssertNotNil(self.secondServer)
+        XCTAssertNotNil(self.server?.client)
+        XCTAssertNotNil(self.secondServer?.client)
+      }
+      
+    }
+
+    //given
+    container.register(.ObjectGraph) { try ResolvableServer(client: self.container.resolve()) as Server }
+      .resolveDependencies { (container: DependencyContainer, server: Server) in
+        let server = server as! ResolvableServer
+        server.secondClient = try container.resolve() as Client
+    }
+    
+    container.register(.ObjectGraph) { ResolvableClient() as Client }
+      .resolveDependencies { (container: DependencyContainer, client: Client) in
+        let client = client as! ResolvableClient
+        client.server = try container.resolve() as Server
+        client.secondServer = try container.resolve() as Server
+    }
+
+    //when
+    let client = (try! container.resolve() as Client) as! ResolvableClient
+    let server = client.server as! ResolvableServer
+    let secondServer = client.secondServer as! ResolvableServer
+    let secondClient = server.secondClient as! ResolvableClient
+    
+    //then
+    XCTAssertTrue(client === server.client)
+    XCTAssertTrue(client === server.secondClient)
+    XCTAssertTrue(client === secondServer.client)
+    XCTAssertTrue(client === secondServer.secondClient)
+    XCTAssertTrue(client === secondClient)
+    XCTAssertTrue(server === secondServer)
+    
+    XCTAssertTrue(client.didResolveDependenciesCalled)
+    XCTAssertTrue(server.didResolveDependenciesCalled)
+  }
+  
+  func testThatItValidatesConfiguration() {
+    //given
+    var createdService1 = false
+    var createdService2 = false
+    var createdService3 = false
+    var createdService = false
+    
+    let service = container.register { ServiceImp1() }
+      .resolveDependencies { container, _ in
+        if container.context.resolvingType == ServiceImp1.self {
+          createdService1 = true
+        }
+        if container.context.resolvingType == Service.self {
+          createdService = true
+        }
+    }
+    container.register(service, type: Service.self)
+    
+    container.register(tag: "tag") { ServiceImp2() as Service }
+      .resolveDependencies { _ in
+        createdService2 = true
+    }
+    
+    container.register() { (arg: String) in ServiceImp1() }
+      .resolveDependencies { _ in
+        createdService3 = true
+    }
+    
+    //then
+    AssertNoThrow(expression: try container.validate("arg"))
+    XCTAssertTrue(createdService1)
+    XCTAssertTrue(createdService2)
+    XCTAssertTrue(createdService3)
+    XCTAssertTrue(createdService)
+  }
+  
+  func testThatItPicksRuntimeArgumentsWhenValidatingConfiguration() {
+    //given
+    let expectedIntArgument = 1
+    let expectedStringArgument = "a"
+    container.register { (a: Int) -> Service in
+      XCTAssertEqual(a, expectedIntArgument)
+      return ServiceImp1() as Service
+    }
+    
+    container.register { (a: Int, b: String) -> Service in
+      XCTAssertEqual(a, expectedIntArgument)
+      XCTAssertEqual(b, expectedStringArgument)
+      return ServiceImp1() as Service
+    }
+    
+    //then
+    AssertNoThrow(expression:
+      try container.validate(
+        "1",
+        expectedIntArgument,
+        "x",
+        (expectedStringArgument, expectedIntArgument),
+        (expectedIntArgument, expectedStringArgument)
+      )
+    )
+  }
+  
+  func testThatItFailsValidationIfNoMatchingArgumentsFound() {
+    //given
+    container.register { (a: Int) -> Service in ServiceImp1() as Service }
+    
+    //then
+    AssertThrows(expression: try container.validate()) { error in error is DipError }
+    AssertThrows(expression: try container.validate("1")) { error in error is DipError }
+  }
+  
+  func testThatItFailsValidationOnlyForDipErrors() {
+    //given
+    container.register { () -> Service in
+      throw NSError(domain: "", code: 0, userInfo: nil)
+    }
+    
+    //then
+    AssertNoThrow(expression: try container.validate())
+    
+    //given
+    let key = DefinitionKey(protocolType: Service.self, argumentsType: Void.self, associatedTag: nil)
+    container.register { () -> Service in
+      throw DipError.DefinitionNotFound(key: key)
+    }
+    
+    //then
+    AssertThrows(expression: try container.validate()) { error in
+      if case let DipError.DefinitionNotFound(_key) = error where _key == key { return true }
+      else { return false }
+    }
+  }
+  
+}

Tests/Dip/RuntimeArgumentsTests.swift

@@ -0,0 +1,296 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+@testable import Dip
+
+private protocol Service {
+  var name: String { get }
+}
+
+private class ServiceImp: Service {
+  
+  let name: String
+  
+  init(name: String, baseURL: String, port: Int) {
+    self.name = name
+  }
+  
+}
+
+private class ServiceImp1: Service {
+  let name: String = "ServiceImp1"
+}
+
+private class ServiceImp2: Service {
+  let name: String = "ServiceImp2"
+}
+
+class RuntimeArgumentsTests: XCTestCase {
+  
+  let container = DependencyContainer()
+ 
+  #if os(Linux)
+  static var allTests: [(String, RuntimeArgumentsTests -> () throws -> Void)] {
+    return [
+      ("testThatItResolvesInstanceWithOneArgument", testThatItResolvesInstanceWithOneArgument),
+      ("testThatItResolvesInstanceWithTwoArguments", testThatItResolvesInstanceWithTwoArguments),
+      ("testThatItResolvesInstanceWithThreeArguments", testThatItResolvesInstanceWithThreeArguments),
+      ("testThatItResolvesInstanceWithFourArguments", testThatItResolvesInstanceWithFourArguments),
+      ("testThatItResolvesInstanceWithFiveArguments", testThatItResolvesInstanceWithFiveArguments),
+      ("testThatItResolvesInstanceWithSixArguments", testThatItResolvesInstanceWithSixArguments),
+      ("testThatItRegistersDifferentFactoriesForDifferentNumberOfArguments", testThatItRegistersDifferentFactoriesForDifferentNumberOfArguments),
+      ("testThatItRegistersDifferentFactoriesForDifferentTypesOfArguments", testThatItRegistersDifferentFactoriesForDifferentTypesOfArguments),
+      ("testThatItRegistersDifferentFactoriesForDifferentOrderOfArguments", testThatItRegistersDifferentFactoriesForDifferentOrderOfArguments),
+      ("testThatNewRegistrationWithSameArgumentsOverridesPreviousRegistration", testThatNewRegistrationWithSameArgumentsOverridesPreviousRegistration),
+      ("testThatDifferentFactoriesRegisteredIfArgumentIsOptional", testThatDifferentFactoriesRegisteredIfArgumentIsOptional)
+    ]
+  }
+
+  func setUp() {
+    container.reset()
+  }
+  #else
+  override func setUp() {
+    container.reset()
+  }
+  #endif
+  
+  func testThatItResolvesInstanceWithOneArgument() {
+    //given
+    let arg1 = 1
+    container.register(factory: { (a1: Int) -> Service in
+      XCTAssertEqual(a1, arg1)
+      return ServiceImp1()
+    })
+    
+    //when
+    let service = try! container.resolve(withArguments: arg1) as Service
+    
+    //then
+    XCTAssertTrue(service is ServiceImp1)
+    
+    //when
+    let anyService = try! container.resolve(Service.self, withArguments: arg1)
+    
+    //then
+    XCTAssertTrue(anyService is ServiceImp1)
+  }
+  
+  func testThatItResolvesInstanceWithTwoArguments() {
+    //given
+    let arg1 = 1, arg2 = 2
+    container.register { (a1: Int, a2: Int) -> Service in
+      XCTAssertEqual(a1, arg1)
+      XCTAssertEqual(a2, arg2)
+      return ServiceImp1()
+    }
+    
+    //when
+    let service = try! container.resolve(withArguments: arg1, arg2) as Service
+    
+    //then
+    XCTAssertTrue(service is ServiceImp1)
+
+    //when
+    let anyService = try! container.resolve(Service.self, withArguments: arg1, arg2)
+    
+    //then
+    XCTAssertTrue(anyService is ServiceImp1)
+  }
+  
+  func testThatItResolvesInstanceWithThreeArguments() {
+    let arg1 = 1, arg2 = 2, arg3 = 3
+    container.register { (a1: Int, a2: Int, a3: Int) -> Service in
+      XCTAssertEqual(a1, arg1)
+      XCTAssertEqual(a2, arg2)
+      XCTAssertEqual(a3, arg3)
+      return ServiceImp1()
+    }
+    
+    //when
+    let service = try! container.resolve(withArguments: arg1, arg2, arg3) as Service
+    
+    //then
+    XCTAssertTrue(service is ServiceImp1)
+    
+    //when
+    let anyService = try! container.resolve(Service.self, withArguments: arg1, arg2, arg3)
+    
+    //then
+    XCTAssertTrue(anyService is ServiceImp1)
+  }
+  
+  func testThatItResolvesInstanceWithFourArguments() {
+    let arg1 = 1, arg2 = 2, arg3 = 3, arg4 = 4
+    container.register { (a1: Int, a2: Int, a3: Int, a4: Int) -> Service in
+      XCTAssertEqual(a1, arg1)
+      XCTAssertEqual(a2, arg2)
+      XCTAssertEqual(a3, arg3)
+      XCTAssertEqual(a4, arg4)
+      return ServiceImp1()
+    }
+    
+    //when
+    let service = try! container.resolve(withArguments: arg1, arg2, arg3, arg4) as Service
+    
+    //then
+    XCTAssertTrue(service is ServiceImp1)
+    
+    //when
+    let anyService = try! container.resolve(Service.self, withArguments: arg1, arg2, arg3, arg4)
+    
+    //then
+    XCTAssertTrue(anyService is ServiceImp1)
+  }
+  
+  func testThatItResolvesInstanceWithFiveArguments() {
+    let arg1 = 1, arg2 = 2, arg3 = 3, arg4 = 4, arg5 = 5
+    container.register { (a1: Int, a2: Int, a3: Int, a4: Int, a5: Int) -> Service in
+      XCTAssertEqual(a1, arg1)
+      XCTAssertEqual(a2, arg2)
+      XCTAssertEqual(a3, arg3)
+      XCTAssertEqual(a4, arg4)
+      XCTAssertEqual(a5, arg5)
+      return ServiceImp1()
+    }
+    
+    //when
+    let service = try! container.resolve(withArguments: arg1, arg2, arg3, arg4, arg5) as Service
+    
+    //then
+    XCTAssertTrue(service is ServiceImp1)
+    
+    //when
+    let anyService = try! container.resolve(Service.self, withArguments: arg1, arg2, arg3, arg4, arg5)
+    
+    //then
+    XCTAssertTrue(anyService is ServiceImp1)
+  }
+  
+  func testThatItResolvesInstanceWithSixArguments() {
+    let arg1 = 1, arg2 = 2, arg3 = 3, arg4 = 4, arg5 = 5, arg6 = 6
+    container.register { (a1: Int, a2: Int, a3: Int, a4: Int, a5: Int, a6: Int) -> Service in
+      XCTAssertEqual(a1, arg1)
+      XCTAssertEqual(a2, arg2)
+      XCTAssertEqual(a3, arg3)
+      XCTAssertEqual(a4, arg4)
+      XCTAssertEqual(a5, arg5)
+      XCTAssertEqual(a6, arg6)
+      return ServiceImp1()
+    }
+    
+    //when
+    let service = try! container.resolve(withArguments: arg1, arg2, arg3, arg4, arg5, arg6) as Service
+    
+    //then
+    XCTAssertTrue(service is ServiceImp1)
+    
+    //when
+    let anyService = try! container.resolve(Service.self, withArguments: arg1, arg2, arg3, arg4, arg5, arg6)
+    
+    //then
+    XCTAssertTrue(anyService is ServiceImp1)
+  }
+  
+  func testThatItRegistersDifferentFactoriesForDifferentNumberOfArguments() {
+    //given
+    let arg1 = 1, arg2 = 2
+    container.register { (a1: Int) in ServiceImp1() as Service }
+    container.register { (a1: Int, a2: Int) in ServiceImp2() as Service }
+    
+    //when
+    let service1 = try! container.resolve(withArguments: arg1) as Service
+    let service2 = try! container.resolve(withArguments: arg1, arg2) as Service
+    
+    //then
+    XCTAssertTrue(service1 is ServiceImp1)
+    XCTAssertTrue(service2 is ServiceImp2)
+  }
+  
+  func testThatItRegistersDifferentFactoriesForDifferentTypesOfArguments() {
+    //given
+    let arg1 = 1, arg2 = "string"
+    container.register(factory: { (a1: Int) in ServiceImp1() as Service })
+    container.register(factory: { (a1: String) in ServiceImp2() as Service })
+    
+    //when
+    let service1 = try! container.resolve(withArguments: arg1) as Service
+    let service2 = try! container.resolve(withArguments: arg2) as Service
+    
+    //then
+    XCTAssertTrue(service1 is ServiceImp1)
+    XCTAssertTrue(service2 is ServiceImp2)
+  }
+  
+  func testThatItRegistersDifferentFactoriesForDifferentOrderOfArguments() {
+    //given
+    let arg1 = 1, arg2 = "string"
+    container.register { (a1: Int, a2: String) in ServiceImp1() as Service }
+    container.register { (a1: String, a2: Int) in ServiceImp2() as Service }
+    
+    //when
+    let service1 = try! container.resolve(withArguments: arg1, arg2) as Service
+    let service2 = try! container.resolve(withArguments: arg2, arg1) as Service
+    
+    //then
+    XCTAssertTrue(service1 is ServiceImp1)
+    XCTAssertTrue(service2 is ServiceImp2)
+  }
+  
+  func testThatNewRegistrationWithSameArgumentsOverridesPreviousRegistration() {
+    //given
+    let arg1 = 1, arg2 = 2
+    container.register { (a1: Int, a2: Int) in ServiceImp1() as Service }
+    let service1 = try! container.resolve(withArguments: arg1, arg2) as Service
+    
+    //when
+    container.register { (a1: Int, a2: Int) in ServiceImp2() as Service }
+    let service2 = try! container.resolve(withArguments: arg1, arg2) as Service
+    
+    //then
+    XCTAssertTrue(service1 is ServiceImp1)
+    XCTAssertTrue(service2 is ServiceImp2)
+  }
+  
+  func testThatDifferentFactoriesRegisteredIfArgumentIsOptional() {
+    //given
+    let name1 = "1", name2 = "2", name3 = "3"
+    container.register { (port: Int, url: String) in ServiceImp(name: name1, baseURL: url, port: port) as Service }
+    container.register { (port: Int, url: String?) in ServiceImp(name: name2, baseURL: url!, port: port) as Service }
+    container.register { (port: Int, url: String!) in ServiceImp(name: name3, baseURL: url, port: port) as Service }
+    
+    //when
+    let service1 = try! container.resolve(withArguments: 80, "http://example.com") as Service
+    let service2 = try! container.resolve(withArguments: 80, "http://example.com" as String?) as Service
+    let service3 = try! container.resolve(withArguments: 80, "http://example.com" as String!) as Service
+    
+    //then
+    XCTAssertEqual(service1.name, name1)
+    XCTAssertEqual(service2.name, name2)
+    XCTAssertEqual(service3.name, name3)
+  }
+  
+}
+

Tests/Dip/ThreadSafetyTests.swift

@@ -0,0 +1,225 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+@testable import Dip
+
+private protocol Server: class {
+  var client: Client? { get set }
+}
+
+private protocol Client: class {
+  var server: Server { get }
+}
+
+private class ClientImp: Client, Equatable {
+  var server: Server
+  init(server: Server) {
+    self.server = server
+  }
+}
+
+private func ==<T: ClientImp>(lhs: T, rhs: T) -> Bool {
+  return lhs === rhs
+}
+
+private class ServerImp: Server, Hashable {
+  weak var client: Client?
+  init() {}
+  
+  var hashValue: Int {
+    return unsafeAddressOf(self).hashValue
+  }
+}
+
+private func ==<T: ServerImp>(lhs: T, rhs: T) -> Bool {
+  return lhs === rhs
+}
+
+private var resolvedServers = Set<ServerImp>()
+private var resolvedClients = Array<ClientImp>()
+
+private var container: DependencyContainer!
+
+#if os(Linux)
+import Glibc
+private var lock: pthread_spinlock_t = 0
+
+private let resolveClientSync: () -> Client? = {
+  var clientPointer: UnsafeMutablePointer<Void> = nil
+  clientPointer = dispatch_sync { _ in
+    let resolved = try! container.resolve() as Client
+    return UnsafeMutablePointer(Unmanaged.passUnretained(resolved as! ClientImp).toOpaque())
+  }
+  return Unmanaged<ClientImp>.fromOpaque(COpaquePointer(clientPointer)).takeUnretainedValue()
+}
+  
+#else
+let queue = NSOperationQueue()
+let lock = NSRecursiveLock()
+  
+private let resolveClientSync: () -> Client? = {
+  var client: Client?
+  dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
+    client = try! container.resolve() as Client
+  }
+  return client
+}
+  
+#endif
+
+let resolveServerAsync = {
+  let service = try! container.resolve() as Server
+  lock.lock()
+  resolvedServers.insert(service as! ServerImp)
+  lock.unlock()
+}
+
+let resolveClientAsync = {
+  let client = try! container.resolve() as Client
+  lock.lock()
+  resolvedClients.append(client as! ClientImp)
+  lock.unlock()
+}
+
+class ThreadSafetyTests: XCTestCase {
+  
+  #if os(Linux)
+  required init(name: String, testClosure: XCTestCase throws -> Void) {
+    pthread_spin_init(&lock, 0)
+  }
+  
+  static var allTests: [(String, ThreadSafetyTests -> () throws -> Void)] {
+    return [
+      ("testSingletonThreadSafety", testSingletonThreadSafety),
+      ("testFactoryThreadSafety", testFactoryThreadSafety),
+      ("testCircularReferenceThreadSafety", testCircularReferenceThreadSafety)
+    ]
+  }
+  
+  func setUp() {
+    container = DependencyContainer()
+  }
+  
+  func tearDown() {
+    resolvedServers.removeAll()
+    resolvedClients.removeAll()
+  }
+  #else
+  override func setUp() {
+    container = DependencyContainer()
+  }
+  
+  override func tearDown() {
+    resolvedServers.removeAll()
+    resolvedClients.removeAll()
+  }
+  #endif
+  
+  func testSingletonThreadSafety() {
+    container.register(.Singleton) { ServerImp() as Server }
+    
+    for _ in 0..<100 {
+      #if os(Linux)
+      dispatch_async({ _ in
+        resolveServerAsync()
+        return nil
+      })
+      #else
+      queue.addOperationWithBlock(resolveServerAsync)
+      #endif
+    }
+    
+    #if os(Linux)
+    sleep(1)
+    #else
+    queue.waitUntilAllOperationsAreFinished()
+    #endif
+    
+    XCTAssertEqual(resolvedServers.count, 1, "Should create only one instance")
+  }
+  
+  
+  func testFactoryThreadSafety() {
+    container.register { ServerImp() as Server }
+    
+    for _ in 0..<100 {
+      #if os(Linux)
+      dispatch_async({ _ in
+        resolveServerAsync()
+        return nil
+      })
+      #else
+      queue.addOperationWithBlock(resolveServerAsync)
+      #endif
+    }
+    
+    #if os(Linux)
+    sleep(1)
+    #else
+    queue.waitUntilAllOperationsAreFinished()
+    #endif
+
+    XCTAssertEqual(resolvedServers.count, 100, "All instances should be different")
+  }
+  
+  
+  func testCircularReferenceThreadSafety() {
+    container.register(.ObjectGraph) {
+      ClientImp(server: try container.resolve()) as Client
+    }
+    
+    container.register(.ObjectGraph) { ServerImp() as Server }
+      .resolveDependencies { container, server in
+        server.client = resolveClientSync()
+    }
+    
+    for _ in 0..<100 {
+      #if os(Linux)
+      dispatch_async({ _ in
+        resolveClientAsync()
+        return nil
+      })
+      #else
+      queue.addOperationWithBlock(resolveClientAsync)
+      #endif
+    }
+    
+    #if os(Linux)
+    sleep(1)
+    #else
+    queue.waitUntilAllOperationsAreFinished()
+    #endif
+    
+    XCTAssertEqual(resolvedClients.count, 100, "Instances should be not reused in different object graphs")
+    for client in resolvedClients {
+      let service = client.server as! ServerImp
+      let serviceClient = service.client as! ClientImp
+      XCTAssertEqual(serviceClient, client, "Instances should be reused when resolving single object graph")
+    }
+  }
+  
+}
+
+

Tests/Dip/Utils.swift

@@ -0,0 +1,88 @@
+//
+// Dip
+//
+// Copyright (c) 2015 Olivier Halligon <olivier@halligon.net>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+
+import XCTest
+
+
+func AssertThrows<T>(file: StaticString = #file, line: UInt = #line, @autoclosure expression: () throws -> T) {
+  AssertThrows(file, line: line, expression: expression, "")
+}
+
+func AssertThrows<T>(file: StaticString = #file, line: UInt = #line, @autoclosure expression: () throws -> T, _ message: String) {
+  AssertThrows(expression: expression, checkError: { _ in true }, message)
+}
+
+func AssertThrows<T>(file: StaticString = #file, line: UInt = #line, @autoclosure expression: () throws -> T, checkError: ErrorType -> Bool) {
+  AssertThrows(file, line: line, expression: expression, checkError: checkError, "")
+}
+
+func AssertThrows<T>(file: StaticString = #file, line: UInt = #line, @autoclosure expression: () throws -> T, checkError: ErrorType -> Bool, _ message: String) {
+  do {
+    try expression()
+    XCTFail(message, file: file, line: line)
+  }
+  catch {
+    XCTAssertTrue(checkError(error), "Thrown unexpected error: \(error)", file: file, line: line)
+  }
+}
+
+func AssertNoThrow<T>(file: StaticString = #file, line: UInt = #line, @autoclosure expression: () throws -> T) {
+  AssertNoThrow(file, line: line, expression: expression, "")
+}
+
+func AssertNoThrow<T>(file: StaticString = #file, line: UInt = #line, @autoclosure expression: () throws -> T, _ message: String) {
+  do {
+    try expression()
+  }
+  catch {
+    XCTFail(message, file: file, line: line)
+  }
+}
+
+#if os(Linux)
+import Glibc
+typealias TMain = @convention(c) (UnsafeMutablePointer<Void>) -> UnsafeMutablePointer<Void>
+
+func dispatch_async(block: TMain) {
+  var pid: pthread_t = 0
+  pthread_create(&pid, nil, block, nil)
+}
+
+func dispatch_sync(block: TMain) -> UnsafeMutablePointer<Void> {
+  var pid: pthread_t = 0
+  var result: UnsafeMutablePointer<Void> = nil
+  pthread_create(&pid, nil, block, nil)
+  pthread_join(pid, &result)
+  return result
+}
+
+extension pthread_spinlock_t {
+  mutating func lock() {
+    pthread_spin_lock(&self)
+  }
+  mutating func unlock() {
+    pthread_spin_unlock(&self)
+  }
+}
+#endif

Tests/LinuxMain.swift

@@ -0,0 +1,13 @@
+import XCTest
+@testable import DipTestSuite
+
+XCTMain([
+    testCase(DipTests.allTests),
+    testCase(DefinitionTests.allTests),
+    testCase(RuntimeArgumentsTests.allTests),
+    testCase(ComponentScopeTests.allTests),
+    testCase(AutoInjectionTests.allTests),
+    testCase(ThreadSafetyTests.allTests),
+    testCase(AutoWiringTests.allTests),
+    testCase(ContextTests.allTests)
+])