base::Bind: Implement CancelableCallback to replace CancelableTaske.

base/cancelable_callback.cc

+// 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/cancelable_callback.h"
+
+namespace base {
+
+CancelableCallback::CancelableCallback(const base::Closure callback)
+    : ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)),
+      forwarder_(base::Bind(&CancelableCallback::RunCallback,
+                            weak_factory_.GetWeakPtr())),
+      callback_(callback) {

[binji, 2011/11/23 02:21:44]

check for !callback.is_null?

[James Hawkins, 2011/11/23 03:59:08]

Done.

+}
+
+void CancelableCallback::Cancel() {
+  weak_factory_.InvalidateWeakPtrs();
+}
+
+const base::Closure& CancelableCallback::callback() const {
+  return forwarder_;
+}
+
+void CancelableCallback::RunCallback() {
+  callback_.Run();
+}
+
+}

[groby-ooo-7-16, 2011/11/23 02:14:12]

nit:
}  // namespace base