Initial import of Cobalt 2.8885 2016-07-27
diff --git a/src/base/memory/weak_ptr.cc b/src/base/memory/weak_ptr.cc
new file mode 100644
index 0000000..9dec8fd
--- /dev/null
+++ b/src/base/memory/weak_ptr.cc
@@ -0,0 +1,73 @@
+// 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() {
+ // 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());
+ is_valid_ = false;
+}
+
+bool WeakReference::Flag::IsValid() const {
+ DCHECK(thread_checker_.CalledOnValidThread());
+ return is_valid_;
+}
+
+WeakReference::Flag::~Flag() {
+}
+
+WeakReference::WeakReference() {
+}
+
+WeakReference::WeakReference(const Flag* flag) : flag_(flag) {
+}
+
+WeakReference::~WeakReference() {
+}
+
+bool WeakReference::is_valid() const {
+ return flag_ && flag_->IsValid();
+}
+
+WeakReferenceOwner::WeakReferenceOwner() {
+}
+
+WeakReferenceOwner::~WeakReferenceOwner() {
+ Invalidate();
+}
+
+WeakReference WeakReferenceOwner::GetRef() const {
+ // We also want to reattach to the current thread if all previous references
+ // have gone away.
+ if (!HasRefs())
+ flag_ = new WeakReference::Flag();
+ return WeakReference(flag_);
+}
+
+void WeakReferenceOwner::Invalidate() {
+ if (flag_) {
+ flag_->Invalidate();
+ flag_ = NULL;
+ }
+}
+
+WeakPtrBase::WeakPtrBase() {
+}
+
+WeakPtrBase::~WeakPtrBase() {
+}
+
+WeakPtrBase::WeakPtrBase(const WeakReference& ref) : ref_(ref) {
+}
+
+} // namespace internal
+} // namespace base
