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// Copyright (c) 2009 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.
// Some basic utilities for aiding in the management of Tasks and Callbacks.
// AutoTaskRunner, and its brother AutoCallbackRunner are the scoped_ptr
// equivalents for callbacks. They are useful for ensuring a callback is
// executed and delete in the face of multiple return points in a function.
#ifndef MEDIA_BASE_CALLBACK_
#define MEDIA_BASE_CALLBACK_
#include "base/scoped_ptr.h"
#include "base/task.h"
namespace media {
class AutoTaskRunner {
public:
// Takes ownership of the task.
explicit AutoTaskRunner(Task* task)
: task_(task) {
}
~AutoTaskRunner() {
if (task_.get()) {
task_->Run();
}
}
Task* release() { return task_.release(); }
private:
scoped_ptr<Task> task_;
DISALLOW_COPY_AND_ASSIGN(AutoTaskRunner);
};
class AutoCallbackRunner {
public:
// Takes ownership of the callback.
explicit AutoCallbackRunner(Callback0::Type* callback)
: callback_(callback) {
}
~AutoCallbackRunner() {
if (callback_.get()) {
callback_->Run();
}
}
Callback0::Type* release() { return callback_.release(); }
private:
scoped_ptr<Callback0::Type> callback_;
DISALLOW_COPY_AND_ASSIGN(AutoCallbackRunner);
};
} // namespace media
#endif // MEDIA_BASE_CALLBACK_
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