зеркало из https://github.com/mozilla/gecko-dev.git
86 строки
1.8 KiB
C++
86 строки
1.8 KiB
C++
/*
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* Copyright 2015, Mozilla Foundation and contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __RefCount_h__
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#define __RefCount_h__
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#include <assert.h>
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#include <stdint.h>
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#include <atomic>
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#include "ClearKeyUtils.h"
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// Note: Thread safe.
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class RefCounted {
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public:
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void AddRef() { ++mRefCount; }
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uint32_t Release() {
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uint32_t newCount = --mRefCount;
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if (!newCount) {
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delete this;
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}
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return newCount;
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}
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protected:
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RefCounted() : mRefCount(0) {}
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virtual ~RefCounted() { assert(!mRefCount); }
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std::atomic<uint32_t> mRefCount;
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};
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template <class T>
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class RefPtr {
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public:
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RefPtr(const RefPtr& src) { Set(src.mPtr); }
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explicit RefPtr(T* aPtr) { Set(aPtr); }
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RefPtr() { Set(nullptr); }
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~RefPtr() { Set(nullptr); }
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T* operator->() const { return mPtr; }
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T** operator&() { return &mPtr; }
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T* operator->() { return mPtr; }
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operator T*() { return mPtr; }
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T* Get() const { return mPtr; }
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RefPtr& operator=(T* aVal) {
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Set(aVal);
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return *this;
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}
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private:
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T* Set(T* aPtr) {
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if (mPtr == aPtr) {
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return aPtr;
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}
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if (mPtr) {
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mPtr->Release();
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}
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mPtr = aPtr;
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if (mPtr) {
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aPtr->AddRef();
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}
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return mPtr;
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}
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T* mPtr = nullptr;
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};
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#endif // __RefCount_h__
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