gecko-dev/media/gmp-clearkey/0.1/RefCounted.h
Jay Harris f44f926c07 Bug 1318965 - Converts gmp-clearkey to use Chromium ContentDecryptionModule8 interface used by widevine r=cpearce
MozReview-Commit-ID: 6lOzItuuvdd

--HG--
extra : rebase_source : b1e98ecd166954f0a9e7e9ad8544504210998f49
extra : histedit_source : 7d73e59040f8f5c15bc26c388b4b40bf2ec1e5fe
2017-01-12 09:52:05 +13:00

99 lines
1.8 KiB
C++

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