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// 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"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
namespace base {
CancelableCallback::CancelableCallback()
: ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
}
CancelableCallback::CancelableCallback(const base::Closure& callback)
: ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)),
callback_(callback) {
DCHECK(!callback.is_null());
InitializeForwarder();
}
CancelableCallback::~CancelableCallback() {}
void CancelableCallback::Cancel() {
weak_factory_.InvalidateWeakPtrs();
callback_.Reset();
}
bool CancelableCallback::IsCancelled() const {
return callback_.is_null();
}
void CancelableCallback::Reset(const base::Closure& callback) {
DCHECK(!callback.is_null());
// Outstanding tasks (e.g., posted to a message loop) must not be called.
Cancel();
// |forwarder_| is no longer valid after Cancel(), so re-bind.
InitializeForwarder();
callback_ = callback;
}
const base::Closure& CancelableCallback::callback() const {
return forwarder_;
}
void CancelableCallback::RunCallback() {
callback_.Run();
}
void CancelableCallback::InitializeForwarder() {
forwarder_ = base::Bind(&CancelableCallback::RunCallback,
weak_factory_.GetWeakPtr());
}
} // namespace bind
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