| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/memory/weak_ptr.h" |
| |
| namespace base { |
| namespace internal { |
| |
| WeakReference::Flag::Flag() : is_valid_(true) {} |
| |
| void WeakReference::Flag::Invalidate() { |
| is_valid_ = false; |
| } |
| |
| bool WeakReference::Flag::IsValid() const { |
| return is_valid_; |
| } |
| |
| WeakReference::Flag::~Flag() = default; |
| |
| WeakReference::WeakReference() = default; |
| |
| WeakReference::WeakReference(const scoped_refptr<Flag>& flag) : flag_(flag) {} |
| |
| WeakReference::~WeakReference() = default; |
| |
| WeakReference::WeakReference(WeakReference&& other) = default; |
| |
| WeakReference::WeakReference(const WeakReference& other) = default; |
| |
| bool WeakReference::is_valid() const { |
| return flag_ && flag_->IsValid(); |
| } |
| |
| WeakReferenceOwner::WeakReferenceOwner() = default; |
| |
| WeakReferenceOwner::~WeakReferenceOwner() { |
| Invalidate(); |
| } |
| |
| WeakReference WeakReferenceOwner::GetRef() const { |
| // If we hold the last reference to the Flag then create a new one. |
| if (!HasRefs()) |
| flag_ = new WeakReference::Flag(); |
| |
| return WeakReference(flag_); |
| } |
| |
| void WeakReferenceOwner::Invalidate() { |
| if (flag_) { |
| flag_->Invalidate(); |
| flag_ = nullptr; |
| } |
| } |
| |
| WeakPtrBase::WeakPtrBase() : ptr_(0) {} |
| |
| WeakPtrBase::~WeakPtrBase() = default; |
| |
| WeakPtrBase::WeakPtrBase(const WeakReference& ref, uintptr_t ptr) |
| : ref_(ref), ptr_(ptr) { |
| DCHECK(ptr_); |
| } |
| |
| WeakPtrFactoryBase::WeakPtrFactoryBase(uintptr_t ptr) : ptr_(ptr) { |
| DCHECK(ptr_); |
| } |
| |
| WeakPtrFactoryBase::~WeakPtrFactoryBase() { |
| ptr_ = 0; |
| } |
| |
| } // namespace internal |
| } // namespace base |