1b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org/* 2b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. 3b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * 4b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * Use of this source code is governed by a BSD-style license 5b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * that can be found in the LICENSE file in the root of the source 6b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * tree. An additional intellectual property rights grant can be found 7b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * in the file PATENTS. All contributing project authors may 8b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org * be found in the AUTHORS file in the root of the source tree. 9b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org */ 10b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 11b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#ifndef SYSTEM_WRAPPERS_INTERFACE_REF_COUNT_H_ 12b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#define SYSTEM_WRAPPERS_INTERFACE_REF_COUNT_H_ 13b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 14c6d6fed3c0a82bb7a09095381b974e8e5eebcb35pbos@webrtc.org#include "webrtc/system_wrappers/interface/atomic32.h" 15b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 16b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.orgnamespace webrtc { 17b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 18b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// This class can be used for instantiating 19b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// reference counted objects. 20b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// int32_t AddRef() and int32_t Release(). 21b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// Usage: 22b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// RefCountImpl<T>* implementation = new RefCountImpl<T>(p); 23b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// 24b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// Example: 25b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// class MyInterface { 26b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// public: 27b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// virtual void DoSomething() = 0; 28b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// virtual int32_t AddRef() = 0; 29b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// virtual int32_t Release() = 0: 30b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// private: 31b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// virtual ~MyInterface(){}; 32b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// } 33b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// class MyImplementation : public MyInterface { 34b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// public: 35b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// virtual DoSomething() { printf("hello"); }; 36b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// }; 37b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// MyImplementation* CreateMyImplementation() { 38b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// RefCountImpl<MyImplementation>* implementation = 39b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// new RefCountImpl<MyImplementation>(); 40b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// return implementation; 41b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org// } 42b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 43b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.orgtemplate <class T> 44b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.orgclass RefCountImpl : public T { 45b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org public: 46b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org RefCountImpl() : ref_count_(0) {} 47b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 48b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org template<typename P> 49b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org explicit RefCountImpl(P p) : T(p), ref_count_(0) {} 50b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 51b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org template<typename P1, typename P2> 52b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org RefCountImpl(P1 p1, P2 p2) : T(p1, p2), ref_count_(0) {} 53b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 54b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org template<typename P1, typename P2, typename P3> 55b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org RefCountImpl(P1 p1, P2 p2, P3 p3) : T(p1, p2, p3), ref_count_(0) {} 56b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 57b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org template<typename P1, typename P2, typename P3, typename P4> 58b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org RefCountImpl(P1 p1, P2 p2, P3 p3, P4 p4) : T(p1, p2, p3, p4), ref_count_(0) {} 59b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 60b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org template<typename P1, typename P2, typename P3, typename P4, typename P5> 61b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org RefCountImpl(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) 62b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org : T(p1, p2, p3, p4, p5), ref_count_(0) {} 63b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 64b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org virtual int32_t AddRef() { 65b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org return ++ref_count_; 66b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 67b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 68b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org virtual int32_t Release() { 69b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org int32_t ref_count; 70b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org ref_count = --ref_count_; 71b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org if (ref_count == 0) 72b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org delete this; 73b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org return ref_count; 74b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org } 75b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 76b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org protected: 77b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org Atomic32 ref_count_; 78b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org}; 79b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 80b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org} // namespace webrtc 81b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org 82b015cbede88899f67a53fbbe581b02ce8e32794andrew@webrtc.org#endif // SYSTEM_WRAPPERS_INTERFACE_REF_COUNT_H_ 83