mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
David Vacca
08d7b542de
Summary: This diff creates the Android OSS build system for the module react/utils As part of this diff I also moved the module to react/utils folder changelog: [internal] internal Reviewed By: JoshuaGross Differential Revision: D22877265 fbshipit-source-id: 717487aacb392d0f08530763a16a638b8021d501
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*/
|
|
|
|
#include <functional>
|
|
|
|
namespace facebook {
|
|
namespace react {
|
|
|
|
/*
|
|
* Implements a moveable-only function that asserts if called more than once
|
|
* or destroyed before calling.
|
|
* Useful for use in debug mode to ensure such guarantees.
|
|
*/
|
|
template <typename ReturnT = void, typename... ArgumentT>
|
|
class CalledOnceMovableOnlyFunction {
|
|
using T = ReturnT(ArgumentT...);
|
|
|
|
std::function<T> function_;
|
|
bool wasCalled_;
|
|
bool wasMovedFrom_;
|
|
|
|
public:
|
|
CalledOnceMovableOnlyFunction(std::function<T> &&function)
|
|
: function_(std::move(function)) {
|
|
wasCalled_ = false;
|
|
wasMovedFrom_ = false;
|
|
}
|
|
|
|
~CalledOnceMovableOnlyFunction() {
|
|
assert(
|
|
(wasCalled_ || wasMovedFrom_) &&
|
|
"`CalledOnceMovableOnlyFunction` is destroyed before being called.");
|
|
}
|
|
|
|
/*
|
|
* Not copyable.
|
|
*/
|
|
CalledOnceMovableOnlyFunction(CalledOnceMovableOnlyFunction const &other) =
|
|
delete;
|
|
CalledOnceMovableOnlyFunction &operator=(
|
|
CalledOnceMovableOnlyFunction const &other) = delete;
|
|
|
|
/*
|
|
* Movable.
|
|
*/
|
|
CalledOnceMovableOnlyFunction(
|
|
CalledOnceMovableOnlyFunction &&other) noexcept {
|
|
wasCalled_ = false;
|
|
wasMovedFrom_ = false;
|
|
other.wasMovedFrom_ = true;
|
|
function_ = std::move(other.function_);
|
|
};
|
|
|
|
CalledOnceMovableOnlyFunction &operator=(
|
|
CalledOnceMovableOnlyFunction &&other) noexcept {
|
|
assert(
|
|
(wasCalled_ || wasMovedFrom_) &&
|
|
"`CalledOnceMovableOnlyFunction` is re-assigned before being called.");
|
|
wasCalled_ = false;
|
|
wasMovedFrom_ = false;
|
|
other.wasMovedFrom_ = true;
|
|
function_ = std::move(other.function_);
|
|
return *this;
|
|
}
|
|
|
|
/*
|
|
* Callable.
|
|
*/
|
|
ReturnT operator()(ArgumentT... args) {
|
|
assert(
|
|
!wasMovedFrom_ &&
|
|
"`CalledOnceMovableOnlyFunction` is called after being moved from.");
|
|
assert(
|
|
!wasCalled_ &&
|
|
"`CalledOnceMovableOnlyFunction` is called more than once.");
|
|
|
|
wasCalled_ = true;
|
|
return function_(args...);
|
|
}
|
|
};
|
|
|
|
} // namespace react
|
|
} // namespace facebook
|