83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
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/*
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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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#include "rtc_base/weak_ptr.h"
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// The implementation is borrowed from chromium except that it does not
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// implement SupportsWeakPtr.
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namespace rtc {
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namespace internal {
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WeakReference::Flag::Flag() : is_valid_(true) {
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// Flags only become bound when checked for validity, or invalidated,
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// so that we can check that later validity/invalidation operations on
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// the same Flag take place on the same sequence.
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checker_.Detach();
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}
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void WeakReference::Flag::Invalidate() {
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RTC_DCHECK(checker_.IsCurrent())
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<< "WeakPtrs must be invalidated on the same sequence.";
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is_valid_ = false;
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}
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bool WeakReference::Flag::IsValid() const {
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RTC_DCHECK(checker_.IsCurrent())
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<< "WeakPtrs must be checked on the same sequence.";
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return is_valid_;
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}
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WeakReference::Flag::~Flag() {}
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WeakReference::WeakReference() {}
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WeakReference::WeakReference(const Flag* flag) : flag_(flag) {}
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WeakReference::~WeakReference() {}
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WeakReference::WeakReference(WeakReference&& other) = default;
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WeakReference::WeakReference(const WeakReference& other) = default;
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bool WeakReference::is_valid() const {
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return flag_.get() && flag_->IsValid();
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}
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WeakReferenceOwner::WeakReferenceOwner() {}
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WeakReferenceOwner::~WeakReferenceOwner() {
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Invalidate();
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}
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WeakReference WeakReferenceOwner::GetRef() const {
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// If we hold the last reference to the Flag then create a new one.
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if (!HasRefs())
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flag_ = new RefCountedObject<WeakReference::Flag>();
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return WeakReference(flag_.get());
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}
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void WeakReferenceOwner::Invalidate() {
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if (flag_.get()) {
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flag_->Invalidate();
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flag_ = nullptr;
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}
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}
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WeakPtrBase::WeakPtrBase() {}
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WeakPtrBase::~WeakPtrBase() {}
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WeakPtrBase::WeakPtrBase(const WeakReference& ref) : ref_(ref) {}
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} // namespace internal
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} // namespace rtc
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