AutoUpdater.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_AUTOUPDATER_H__
#define __I6ENGINE_UTILS_AUTOUPDATER_H__

#include <functional>
#include <string>
#include <vector>

#include "i6eSystemParameters.h"

namespace i6e {
namespace utils {

        template<typename T>
        class AutoUpdater {
        public:
                AutoUpdater() : _value(T()), _functions() {
                }

                AutoUpdater(const T & value) : _value(value), _functions() {
                }

                void registerUpdate(const std::function<void(T)> & func) {
                        _functions.push_back(func);
                }

                T get() const {
                        return _value;
                }

                void set(const T & val) {
                        _value = val;
                        for (std::function<void(T)> & method : _functions) {
                                method(_value);
                        }
                }

                T & operator=(const T & val) {
                        set(val);
                        return _value;
                }

                AutoUpdater<T> & operator+=(const T & val) {
                        set(_value + val);
                        return *this;
                }

                AutoUpdater<T> & operator-=(const T & val) {
                        set(_value - val);
                        return *this;
                }

                AutoUpdater<T> & operator*=(const T & val) {
                        set(_value * val);
                        return *this;
                }

                AutoUpdater<T> & operator/=(const T & val) {
                        set(_value / val);
                        return *this;
                }

                operator T() const {
                        return _value;
                }
                
                T operator++() {
                        *this += 1;
                        return _value;
                }

                T operator++(int) {
                        T tmp = _value;
                        *this += 1;
                        return tmp;
                }

         private:
                T _value;

                std::vector<std::function<void(T)>> _functions;
        };

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

#endif /* __I6ENGINE_UTILS_AUTOUPDATER_H__ */