--- /dev/null
+// 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 "include/base/cef_weak_ptr.h"
+
+namespace base {
+namespace cef_internal {
+
+WeakReference::Flag::Flag() : is_valid_(true) {
+ // Flags only become bound when checked for validity, or invalidated,
+ // so that we can check that later validity/invalidation operations on
+ // the same Flag take place on the same thread.
+ thread_checker_.DetachFromThread();
+}
+
+void WeakReference::Flag::Invalidate() {
+ // The flag being invalidated with a single ref implies that there are no
+ // weak pointers in existence. Allow deletion on other thread in this case.
+ DCHECK(thread_checker_.CalledOnValidThread() || HasOneRef())
+ << "WeakPtrs must be invalidated on the same thread.";
+ is_valid_ = false;
+}
+
+bool WeakReference::Flag::IsValid() const {
+ DCHECK(thread_checker_.CalledOnValidThread())
+ << "WeakPtrs must be checked on the same thread.";
+ return is_valid_;
+}
+
+WeakReference::Flag::~Flag() {
+}
+
+WeakReference::WeakReference() {
+}
+
+WeakReference::WeakReference(const Flag* flag) : flag_(flag) {
+}
+
+WeakReference::~WeakReference() {
+}
+
+bool WeakReference::is_valid() const { return flag_.get() && flag_->IsValid(); }
+
+WeakReferenceOwner::WeakReferenceOwner() {
+}
+
+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_.get());
+}
+
+void WeakReferenceOwner::Invalidate() {
+ if (flag_.get()) {
+ flag_->Invalidate();
+ flag_ = NULL;
+ }
+}
+
+WeakPtrBase::WeakPtrBase() {
+}
+
+WeakPtrBase::~WeakPtrBase() {
+}
+
+WeakPtrBase::WeakPtrBase(const WeakReference& ref) : ref_(ref) {
+}
+
+} // namespace cef_internal
+} // namespace base