179 lines
4.8 KiB
C
179 lines
4.8 KiB
C
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/*
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* Copyright 2011 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_BASE_REFCOUNT_H_
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#define WEBRTC_BASE_REFCOUNT_H_
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#include <string.h>
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#include <utility>
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#include "webrtc/base/atomicops.h"
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namespace rtc {
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// Reference count interface.
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class RefCountInterface {
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public:
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virtual int AddRef() const = 0;
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virtual int Release() const = 0;
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protected:
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virtual ~RefCountInterface() {}
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};
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template <class T>
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class RefCountedObject : public T {
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public:
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RefCountedObject() {}
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template <typename P>
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explicit RefCountedObject(const P& p) : T(p) {}
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template <typename P>
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explicit RefCountedObject(P&& p) : T(std::move(p)) {}
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template <typename P1, typename P2>
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RefCountedObject(P1 p1, P2 p2) : T(p1, p2) {}
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template <typename P1, typename P2, typename P3>
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RefCountedObject(P1 p1, P2 p2, P3 p3) : T(p1, p2, p3) {}
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template <typename P1, typename P2, typename P3, typename P4>
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RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4) : T(p1, p2, p3, p4) {}
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template <typename P1, typename P2, typename P3, typename P4, typename P5>
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RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) : T(p1, p2, p3, p4, p5) {}
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template <typename P1,
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typename P2,
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typename P3,
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typename P4,
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typename P5,
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typename P6>
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RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6)
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: T(p1, p2, p3, p4, p5, p6) {}
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template <typename P1,
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typename P2,
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typename P3,
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typename P4,
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typename P5,
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typename P6,
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typename P7>
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RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7)
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: T(p1, p2, p3, p4, p5, p6, p7) {}
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template <typename P1,
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typename P2,
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typename P3,
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typename P4,
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typename P5,
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typename P6,
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typename P7,
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typename P8>
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RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7, P8 p8)
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: T(p1, p2, p3, p4, p5, p6, p7, p8) {}
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template <typename P1,
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typename P2,
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typename P3,
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typename P4,
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typename P5,
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typename P6,
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typename P7,
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typename P8,
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typename P9>
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RefCountedObject(P1 p1,
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P2 p2,
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P3 p3,
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P4 p4,
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P5 p5,
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P6 p6,
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P7 p7,
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P8 p8,
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P9 p9)
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: T(p1, p2, p3, p4, p5, p6, p7, p8, p9) {}
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template <typename P1,
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typename P2,
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typename P3,
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typename P4,
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typename P5,
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typename P6,
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typename P7,
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typename P8,
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typename P9,
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typename P10>
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RefCountedObject(P1 p1,
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P2 p2,
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P3 p3,
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P4 p4,
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P5 p5,
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P6 p6,
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P7 p7,
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P8 p8,
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P9 p9,
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P10 p10)
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: T(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10) {}
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template <typename P1,
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typename P2,
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typename P3,
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typename P4,
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typename P5,
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typename P6,
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typename P7,
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typename P8,
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typename P9,
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typename P10,
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typename P11>
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RefCountedObject(P1 p1,
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P2 p2,
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P3 p3,
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P4 p4,
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P5 p5,
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P6 p6,
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P7 p7,
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P8 p8,
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P9 p9,
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P10 p10,
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P11 p11)
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: T(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11) {}
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virtual int AddRef() const { return AtomicOps::Increment(&ref_count_); }
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virtual int Release() const {
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int count = AtomicOps::Decrement(&ref_count_);
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if (!count) {
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delete this;
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}
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return count;
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}
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// Return whether the reference count is one. If the reference count is used
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// in the conventional way, a reference count of 1 implies that the current
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// thread owns the reference and no other thread shares it. This call
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// performs the test for a reference count of one, and performs the memory
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// barrier needed for the owning thread to act on the object, knowing that it
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// has exclusive access to the object.
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virtual bool HasOneRef() const {
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return AtomicOps::AcquireLoad(&ref_count_) == 1;
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}
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protected:
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virtual ~RefCountedObject() {}
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mutable volatile int ref_count_ = 0;
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};
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} // namespace rtc
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#endif // WEBRTC_BASE_REFCOUNT_H_
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