113 lines
2.5 KiB
C++
113 lines
2.5 KiB
C++
/*
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* Modern effects for a modern Streamer
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* Copyright (C) 2017 Michael Fabian Dirks
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#pragma once
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#include <functional>
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#include <list>
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namespace util {
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template<typename... _args>
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class event {
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std::list<std::function<void(_args...)>> listeners;
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std::function<void()> listen_cb;
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std::function<void()> silence_cb;
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public /* functions */:
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// Add new listener.
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inline void add(std::function<void(_args...)> listener)
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{
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if (listeners.size() == 0) {
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if (listen_cb) {
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listen_cb();
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}
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}
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listeners.push_back(listener);
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}
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// Remove existing listener.
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inline void remove(std::function<void(_args...)> listener)
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{
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listeners.remove(listener);
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if (listeners.size() == 0) {
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if (silence_cb) {
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silence_cb();
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}
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}
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}
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// Check if empty / no listeners.
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inline bool empty()
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{
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return listeners.empty();
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}
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// Remove all listeners.
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inline void clear()
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{
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listeners.clear();
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if (silence_cb) {
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silence_cb();
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}
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}
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public /* operators */:
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// Call Listeners with arguments.
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/// Not valid without the extra template.
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template<typename... _largs>
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inline void operator()(_args... args)
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{
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for (auto& l : listeners) {
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l(args...);
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}
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}
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// Convert to bool (true if not empty, false if empty).
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inline operator bool()
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{
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return !this->empty();
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}
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// Add new listener.
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inline event<_args...>& operator+=(std::function<void(_args...)> listener)
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{
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this->add(listener);
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return *this;
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}
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// Remove existing listener.
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inline event<_args...>& operator-=(std::function<void(_args...)> listener)
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{
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this->remove(listener);
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return *this;
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}
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public /* events */:
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void set_listen_callback(std::function<void()> cb)
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{
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this->listen_cb = cb;
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}
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void set_silence_callback(std::function<void()> cb)
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{
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this->silence_cb = cb;
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}
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};
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} // namespace util
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