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// Copyright (c) 2012 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.
#ifndef BASE_TASK_RUNNER_UTIL_H_
#define BASE_TASK_RUNNER_UTIL_H_
#include <memory>
#include <utility>
#include "base/bind.h"
#include "base/callback.h"
#include "base/check.h"
#include "base/post_task_and_reply_with_result_internal.h"
#include "base/task_runner.h"
namespace base {
// When you have these methods
//
// R DoWorkAndReturn();
// void Callback(const R& result);
//
// and want to call them in a PostTaskAndReply kind of fashion where the
// result of DoWorkAndReturn is passed to the Callback, you can use
// PostTaskAndReplyWithResult as in this example:
//
// PostTaskAndReplyWithResult(
// target_thread_.task_runner(),
// FROM_HERE,
// BindOnce(&DoWorkAndReturn),
// BindOnce(&Callback));
//
// DEPRECATED: Prefer calling|task_runner->PostTaskAndReplyWithResult(...)|
// directly.
// TODO(gab): Mass-migrate to the member method.
template <typename TaskReturnType, typename ReplyArgType>
bool PostTaskAndReplyWithResult(TaskRunner* task_runner,
const Location& from_here,
OnceCallback<TaskReturnType()> task,
OnceCallback<void(ReplyArgType)> reply) {
DCHECK(task);
DCHECK(reply);
// std::unique_ptr used to avoid the need of a default constructor.
auto* result = new std::unique_ptr<TaskReturnType>();
return task_runner->PostTaskAndReply(
from_here,
BindOnce(&internal::ReturnAsParamAdapter<TaskReturnType>, std::move(task),
result),
BindOnce(&internal::ReplyAdapter<TaskReturnType, ReplyArgType>,
std::move(reply), Owned(result)));
}
} // namespace base
#endif // BASE_TASK_RUNNER_UTIL_H_
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