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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/react-native/ReactCommon/react/utils
Просмотр файла: ManagedObjectWrapper.h
/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include <react/debug/react_native_assert.h>
#if defined(__APPLE__)
#include <TargetConditionals.h>
#endif
#if defined(__OBJC__) && defined(__cplusplus)
#if TARGET_OS_MAC
#include <memory>
#import <Foundation/Foundation.h>
@interface RCTInternalGenericWeakWrapper : NSObject
@property (nonatomic, weak) id object;
@end
namespace facebook::react {
namespace detail {
/*
* A custom deleter used for the deallocation of Objective-C managed objects.
* To be used only by `wrapManagedObject`.
*/
void wrappedManagedObjectDeleter(void *cfPointer) noexcept;
} // namespace detail
/*
* `wrapManagedObject` and `unwrapManagedObject` are wrapper functions that
* convert ARC-managed objects into `std::shared_ptr<void>` and vice-versa. It's
* a very useful mechanism when we need to pass Objective-C objects through pure
* C++ code, pass blocks into C++ lambdas, and so on.
*
* The idea behind this mechanism is quite simple but tricky: When we
* instantiate a C++ shared pointer for a managed object, we practically call
* `CFRetain` for it once and then we represent this single retaining operation
* as a counter inside the shared pointer; when the counter became zero, we call
* `CFRelease` on the object. In this model, one bump of ARC-managed counter is
* represented as multiple bumps of C++ counter, so we can have multiple
* counters for the same object that form some kind of counters tree.
*/
inline std::shared_ptr<void> wrapManagedObject(id object) noexcept
{
return std::shared_ptr<void>((__bridge_retained void *)object, detail::wrappedManagedObjectDeleter);
}
inline id unwrapManagedObject(const std::shared_ptr<void> &object) noexcept
{
return (__bridge id)object.get();
}
inline std::shared_ptr<void> wrapManagedObjectWeakly(id object) noexcept
{
RCTInternalGenericWeakWrapper *weakWrapper = [RCTInternalGenericWeakWrapper new];
weakWrapper.object = object;
return wrapManagedObject(weakWrapper);
}
inline id unwrapManagedObjectWeakly(const std::shared_ptr<void> &object) noexcept
{
RCTInternalGenericWeakWrapper *weakWrapper = (RCTInternalGenericWeakWrapper *)unwrapManagedObject(object);
react_native_assert(weakWrapper && "`RCTInternalGenericWeakWrapper` instance must not be `nil`.");
return weakWrapper.object;
}
} // namespace facebook::react
#endif
#endif
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