mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Kevin Gozali
7143d89d81
Summary: This is utility for TurboModule codegen for the purpose of typesafety. It is not used anywhere else at the moment. Reviewed By: cpojer Differential Revision: D15929957 fbshipit-source-id: ecf68cc98b78bc5b9c2078492b853a677b625eea
48 lines
1.5 KiB
Objective-C
48 lines
1.5 KiB
Objective-C
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <utility>
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#import <Foundation/Foundation.h>
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#import <React/RCTBridgeModule.h>
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#import <React/RCTDefines.h>
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/**
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* Interop type layer for RN's exportedConstants and the C++ structs generated by our typesafety codegen.
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*
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* The NativeModuleSpec will define a constantsToExport method which you can implement as follows:
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*
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* - (nonnull ModuleConstants<JS::Constants>)constantsToExport
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* {
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* return typedConstants<JS::Constants>({ ... });
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* }
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*/
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// Internal container for module constants. Do not use yourself directly, instead use the typedConstants helpers below.
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@interface _RCTTypedModuleConstants<StructType> : NSDictionary<NSString *, id>
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+ (instancetype)newWithUnsafeDictionary:(NSDictionary<NSString *, id> *)dictionary;
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@end
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namespace facebook {
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namespace react {
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// Objective-C doesn't allow arbitrary types in its lightweight generics, only object and block types. We can work
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// around that by having the struct type we care about be a block-argument. The block never exists at runtime.
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template<typename T>
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using ModuleConstants = _RCTTypedModuleConstants<void (^)(T)> *;
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template<typename T>
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ModuleConstants<T> typedConstants(typename T::Builder::Input &&value) {
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typename T::Builder builder(std::move(value));
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return [_RCTTypedModuleConstants newWithUnsafeDictionary:builder.buildUnsafeRawValue()];
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}
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} }
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