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70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TASK_RUNNER_UTIL_H_
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#define BASE_TASK_RUNNER_UTIL_H_
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#include <memory>
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#include <utility>
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#include "base/bind.h"
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#include "base/bind_helpers.h"
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#include "base/callback.h"
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#include "base/logging.h"
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#include "base/post_task_and_reply_with_result_internal.h"
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#include "base/task_runner.h"
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namespace base {
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// When you have these methods
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//
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// R DoWorkAndReturn();
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// void Callback(const R& result);
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//
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// and want to call them in a PostTaskAndReply kind of fashion where the
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// result of DoWorkAndReturn is passed to the Callback, you can use
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// PostTaskAndReplyWithResult as in this example:
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//
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// PostTaskAndReplyWithResult(
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// target_thread_.task_runner(),
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// FROM_HERE,
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// BindOnce(&DoWorkAndReturn),
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// BindOnce(&Callback));
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template <typename TaskReturnType, typename ReplyArgType>
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bool PostTaskAndReplyWithResult(TaskRunner* task_runner,
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const Location& from_here,
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OnceCallback<TaskReturnType()> task,
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OnceCallback<void(ReplyArgType)> reply) {
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DCHECK(task);
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DCHECK(reply);
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// std::unique_ptr used to avoid the need of a default constructor.
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auto* result = new std::unique_ptr<TaskReturnType>();
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return task_runner->PostTaskAndReply(
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from_here,
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BindOnce(&internal::ReturnAsParamAdapter<TaskReturnType>, std::move(task),
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result),
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BindOnce(&internal::ReplyAdapter<TaskReturnType, ReplyArgType>,
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std::move(reply), Owned(result)));
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}
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// Callback version of PostTaskAndReplyWithResult above.
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// Though RepeatingCallback is convertible to OnceCallback, we need this since
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// we cannot use template deduction and object conversion at once on the
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// overload resolution.
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// TODO(crbug.com/714018): Update all callers of the Callback version to use
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// OnceCallback.
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template <typename TaskReturnType, typename ReplyArgType>
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bool PostTaskAndReplyWithResult(TaskRunner* task_runner,
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const Location& from_here,
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Callback<TaskReturnType()> task,
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Callback<void(ReplyArgType)> reply) {
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return PostTaskAndReplyWithResult(
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task_runner, from_here, OnceCallback<TaskReturnType()>(std::move(task)),
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OnceCallback<void(ReplyArgType)>(std::move(reply)));
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}
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} // namespace base
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#endif // BASE_TASK_RUNNER_UTIL_H_
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