Future.h

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/*
 * i6engine
 * Copyright (2016) Daniel Bonrath, Michael Baer, All rights reserved.
 *
 * This file is part of i6engine; i6engine is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef __I6ENGINE_UTILS_FUTURE_H__
#define __I6ENGINE_UTILS_FUTURE_H__

#include <atomic>
#include <condition_variable>
#include <memory>
#include <mutex>

namespace i6e {
namespace utils {

        template<typename T>
        class Future {
        public:
                Future() : _value(), _finished(false), _lockValue(), _valueCondVar() {
                }

                T get() const {
                        if (!_finished) {
                                std::unique_lock<std::mutex> ul(_lockValue);
                                _valueCondVar.wait(ul);
                        }
                        return _value;
                }

                void push(T value) {
                        _value = value;
                        _finished = true;
                        std::unique_lock<std::mutex> ul(_lockValue);
                        _valueCondVar.notify_one();
                }

        private:
                T _value;
                std::atomic<bool> _finished;
                mutable std::mutex _lockValue;
                mutable std::condition_variable _valueCondVar;
        };

} /* namespace utils */
} /* namespace i6e */

#endif /* __I6ENGINE_UTILS_FUTURE_H__ */