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// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef INCLUDED_SRC_BUILDTOOL_MULTITHREADING_TASK_HPP
#define INCLUDED_SRC_BUILDTOOL_MULTITHREADING_TASK_HPP
#include <functional>
#include <type_traits>
#include <utility> // std::move
class Task {
public:
using TaskFunc = std::function<void()>;
Task() noexcept = default;
// NOLINTNEXTLINE(modernize-pass-by-value)
explicit Task(TaskFunc const& function) noexcept : f_{function} {}
explicit Task(TaskFunc&& function) noexcept : f_{std::move(function)} {}
void operator()() { f_(); }
// To be able to discern whether the internal f_ has been set or not,
// allowing us to write code such as:
/*
Task t;
while (!t) {
t = TryGetTaskFromQueue(); // (*)
}
t(); // (**)
*/
// (*) does `return Task();` or `return {};` if queue is empty or locked)
// (**) we can now surely execute the task (and be sure it won't throw any
// exception) (for the sake of the example, imagine we are sure that the
// queue wasn't empty, otherwise this would be an infinite loop)
explicit operator bool() const noexcept { return f_.operator bool(); }
private:
TaskFunc f_;
};
#endif // INCLUDED_SRC_BUILDTOOL_MULTITHREADING_TASK_HPP
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