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/*
* Copyright 2016 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 WEBRTC_BASE_REFCOUNTEDOBJECT_H_
#define WEBRTC_BASE_REFCOUNTEDOBJECT_H_
#include <utility>
#include "webrtc/base/atomicops.h"
namespace rtc {
template <class T>
class RefCountedObject : public T {
public:
RefCountedObject() {}
template <class P0>
explicit RefCountedObject(P0&& p0) : T(std::forward<P0>(p0)) {}
template <class P0, class P1, class... Args>
RefCountedObject(P0&& p0, P1&& p1, Args&&... args)
: T(std::forward<P0>(p0),
std::forward<P1>(p1),
std::forward<Args>(args)...) {}
virtual int AddRef() const { return AtomicOps::Increment(&ref_count_); }
virtual int Release() const {
int count = AtomicOps::Decrement(&ref_count_);
if (!count) {
delete this;
}
return count;
}
// Return whether the reference count is one. If the reference count is used
// in the conventional way, a reference count of 1 implies that the current
// thread owns the reference and no other thread shares it. This call
// performs the test for a reference count of one, and performs the memory
// barrier needed for the owning thread to act on the object, knowing that it
// has exclusive access to the object.
virtual bool HasOneRef() const {
return AtomicOps::AcquireLoad(&ref_count_) == 1;
}
protected:
virtual ~RefCountedObject() {}
mutable volatile int ref_count_ = 0;
};
} // namespace rtc
#endif // WEBRTC_BASE_REFCOUNTEDOBJECT_H_
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