зеркало из https://github.com/mozilla/gecko-dev.git
145 строки
4.1 KiB
C++
145 строки
4.1 KiB
C++
/*
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* Copyright (C) 2014-2021 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// Adapted from
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// https://github.com/WebKit/WebKit/blob/ad340677c00a4b4b6a299c93a6e18cd073b3f4e9/Source/WTF/wtf/OSObjectPtr.h
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#ifndef mozilla_DarwinObjectPtr_h
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#define mozilla_DarwinObjectPtr_h
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#include <os/object.h>
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#include <utility>
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#include "mozilla/Attributes.h"
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// Because ARC enablement is a compile-time choice, and we compile this header
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// both ways, we need a separate copy of our code when ARC is enabled.
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#if __has_feature(objc_arc)
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# define AdoptDarwinObject AdoptDarwinObjectArc
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# define RetainDarwinObject RetainDarwinObjectArc
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# define ReleaseDarwinObject ReleaseDarwinObjectArc
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#endif
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namespace mozilla {
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template <typename>
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class DarwinObjectPtr;
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template <typename T>
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[[nodiscard]] DarwinObjectPtr<T> AdoptDarwinObject(T);
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template <typename T>
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static inline void RetainDarwinObject(T aPtr) {
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#if !__has_feature(objc_arc)
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os_retain(aPtr);
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#endif
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}
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template <typename T>
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static inline void ReleaseDarwinObject(T aPtr) {
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#if !__has_feature(objc_arc)
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os_release(aPtr);
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#endif
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}
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template <typename T>
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class DarwinObjectPtr {
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public:
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DarwinObjectPtr() : mPtr(nullptr) {}
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~DarwinObjectPtr() {
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if (mPtr) {
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ReleaseDarwinObject(mPtr);
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}
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}
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T get() const { return mPtr; }
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explicit operator bool() const { return mPtr; }
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bool operator!() const { return !mPtr; }
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DarwinObjectPtr(const DarwinObjectPtr& aOther) : mPtr(aOther.mPtr) {
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if (mPtr) {
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RetainDarwinObject(mPtr);
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}
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}
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DarwinObjectPtr(DarwinObjectPtr&& aOther) : mPtr(std::move(aOther.mPtr)) {
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aOther.mPtr = nullptr;
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}
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MOZ_IMPLICIT DarwinObjectPtr(T aPtr) : mPtr(std::move(aPtr)) {
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if (mPtr) {
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RetainDarwinObject(mPtr);
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}
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}
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DarwinObjectPtr& operator=(const DarwinObjectPtr& aOther) {
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DarwinObjectPtr ptr = aOther;
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swap(ptr);
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return *this;
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}
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DarwinObjectPtr& operator=(DarwinObjectPtr&& aOther) {
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DarwinObjectPtr ptr = std::move(aOther);
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swap(ptr);
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return *this;
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}
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DarwinObjectPtr& operator=(std::nullptr_t) {
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if (mPtr) {
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ReleaseDarwinObject(mPtr);
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}
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mPtr = nullptr;
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return *this;
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}
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DarwinObjectPtr& operator=(T aOther) {
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DarwinObjectPtr ptr = std::move(aOther);
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swap(ptr);
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return *this;
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}
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void swap(DarwinObjectPtr& aOther) { std::swap(mPtr, aOther.mPtr); }
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[[nodiscard]] T forget() { return std::exchange(mPtr, nullptr); }
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friend DarwinObjectPtr AdoptDarwinObject<T>(T);
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private:
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struct AdoptDarwinObjectTag {};
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DarwinObjectPtr(AdoptDarwinObjectTag, T aPtr) : mPtr(std::move(aPtr)) {}
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T mPtr;
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};
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template <typename T>
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inline DarwinObjectPtr<T> AdoptDarwinObject(T aPtr) {
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return DarwinObjectPtr<T>{typename DarwinObjectPtr<T>::AdoptDarwinObjectTag{},
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std::move(aPtr)};
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}
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} // namespace mozilla
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#endif
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