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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef SYSTEM_WRAPPERS_INCLUDE_REF_COUNT_H_
#define SYSTEM_WRAPPERS_INCLUDE_REF_COUNT_H_
#include "webrtc/system_wrappers/include/atomic32.h"
namespace webrtc {
// This class can be used for instantiating
// reference counted objects.
// int32_t AddRef() and int32_t Release().
// Usage:
// RefCountImpl<T>* implementation = new RefCountImpl<T>(p);
//
// Example:
// class MyInterface {
// public:
// virtual void DoSomething() = 0;
// virtual int32_t AddRef() = 0;
// virtual int32_t Release() = 0:
// private:
// virtual ~MyInterface(){};
// }
// class MyImplementation : public MyInterface {
// public:
// virtual DoSomething() { printf("hello"); };
// };
// MyImplementation* CreateMyImplementation() {
// RefCountImpl<MyImplementation>* implementation =
// new RefCountImpl<MyImplementation>();
// return implementation;
// }
template <class T>
class RefCountImpl : public T {
public:
RefCountImpl() : ref_count_(0) {}
template<typename P>
explicit RefCountImpl(P p) : T(p), ref_count_(0) {}
template<typename P1, typename P2>
RefCountImpl(P1 p1, P2 p2) : T(p1, p2), ref_count_(0) {}
template<typename P1, typename P2, typename P3>
RefCountImpl(P1 p1, P2 p2, P3 p3) : T(p1, p2, p3), ref_count_(0) {}
template<typename P1, typename P2, typename P3, typename P4>
RefCountImpl(P1 p1, P2 p2, P3 p3, P4 p4) : T(p1, p2, p3, p4), ref_count_(0) {}
template<typename P1, typename P2, typename P3, typename P4, typename P5>
RefCountImpl(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5)
: T(p1, p2, p3, p4, p5), ref_count_(0) {}
int32_t AddRef() const override {
return ++ref_count_;
}
int32_t Release() const override {
int32_t ref_count;
ref_count = --ref_count_;
if (ref_count == 0)
delete this;
return ref_count;
}
protected:
mutable Atomic32 ref_count_;
};
} // namespace webrtc
#endif // SYSTEM_WRAPPERS_INCLUDE_REF_COUNT_H_
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