obs-StreamFX/source/util-event.hpp

/*
 * Modern effects for a modern Streamer
 * Copyright (C) 2017 Michael Fabian Dirks
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#pragma once
#include <functional>
#include <list>

namespace util {
	template<typename... _args>
	class event {
		std::list<std::function<void(_args...)>> listeners;

		public:
		void add(std::function<void(_args...)> listener)
		{
			listeners.push_back(listener);
		}

		void remove(std::function<void(_args...)> listener)
		{
			listeners.remove(listener);
		}

		// Not valid without the extra template.
		template<typename... _largs>
		void operator()(_args... args)
		{
			for (auto& l : listeners) {
				l(args...);
			}
		}

		operator bool()
		{
			return !listeners.empty();
		}

		public:
		bool empty()
		{
			return listeners.empty();
		}

		void clear()
		{
			listeners.clear();
		}
	};
} // namespace util