143 lines
4.8 KiB
C++
143 lines
4.8 KiB
C++
/*
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* Copyright 2016 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 RTC_BASE_REF_COUNTED_OBJECT_H_
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#define RTC_BASE_REF_COUNTED_OBJECT_H_
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#include "api/scoped_refptr.h"
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#include "rtc_base/ref_count.h"
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#include "rtc_base/ref_counter.h"
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namespace webrtc {
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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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RefCountedObject(const RefCountedObject&) = delete;
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RefCountedObject& operator=(const RefCountedObject&) = delete;
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template <class P0>
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explicit RefCountedObject(P0&& p0) : T(std::forward<P0>(p0)) {}
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template <class P0, class P1, class... Args>
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RefCountedObject(P0&& p0, P1&& p1, Args&&... args)
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: T(std::forward<P0>(p0),
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std::forward<P1>(p1),
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std::forward<Args>(args)...) {}
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void AddRef() const override { ref_count_.IncRef(); }
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RefCountReleaseStatus Release() const override {
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const auto status = ref_count_.DecRef();
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if (status == RefCountReleaseStatus::kDroppedLastRef) {
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delete this;
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}
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return status;
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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 { return ref_count_.HasOneRef(); }
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protected:
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~RefCountedObject() override {}
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mutable webrtc::webrtc_impl::RefCounter ref_count_{0};
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};
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template <class T>
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class FinalRefCountedObject final : public T {
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public:
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using T::T;
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// Above using declaration propagates a default move constructor
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// FinalRefCountedObject(FinalRefCountedObject&& other), but we also need
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// move construction from T.
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explicit FinalRefCountedObject(T&& other) : T(std::move(other)) {}
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FinalRefCountedObject(const FinalRefCountedObject&) = delete;
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FinalRefCountedObject& operator=(const FinalRefCountedObject&) = delete;
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void AddRef() const { ref_count_.IncRef(); }
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RefCountReleaseStatus Release() const {
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const auto status = ref_count_.DecRef();
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if (status == RefCountReleaseStatus::kDroppedLastRef) {
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delete this;
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}
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return status;
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}
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bool HasOneRef() const { return ref_count_.HasOneRef(); }
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private:
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~FinalRefCountedObject() = default;
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mutable webrtc::webrtc_impl::RefCounter ref_count_{0};
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};
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} // namespace webrtc
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// Backwards compatibe aliases.
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// TODO: https://issues.webrtc.org/42225969 - deprecate and remove.
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namespace rtc {
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// Because there are users of this template that use "friend
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// rtc::RefCountedObject<>" to give access to a private destructor, some
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// indirection is needed; "friend" declarations cannot span an "using"
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// declaration. Since a templated class on top of a templated class can't access
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// the subclass' protected members, we duplicate the entire class instead.
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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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RefCountedObject(const RefCountedObject&) = delete;
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RefCountedObject& operator=(const RefCountedObject&) = delete;
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template <class P0>
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explicit RefCountedObject(P0&& p0) : T(std::forward<P0>(p0)) {}
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template <class P0, class P1, class... Args>
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RefCountedObject(P0&& p0, P1&& p1, Args&&... args)
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: T(std::forward<P0>(p0),
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std::forward<P1>(p1),
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std::forward<Args>(args)...) {}
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void AddRef() const override { ref_count_.IncRef(); }
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webrtc::RefCountReleaseStatus Release() const override {
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const auto status = ref_count_.DecRef();
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if (status == webrtc::RefCountReleaseStatus::kDroppedLastRef) {
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delete this;
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}
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return status;
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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 { return ref_count_.HasOneRef(); }
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protected:
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~RefCountedObject() override {}
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mutable webrtc::webrtc_impl::RefCounter ref_count_{0};
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};
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template <typename T>
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using FinalRefCountedObject = webrtc::FinalRefCountedObject<T>;
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} // namespace rtc
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#endif // RTC_BASE_REF_COUNTED_OBJECT_H_
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