mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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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, or (at your option)
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* 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; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __SIGNAL_H__
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#define __SIGNAL_H__
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#include <cstdint>
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#include <list>
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#include <functional>
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#include <memory>
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#include "utility.hpp"
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/* Tweaked and vastly simplified implementation of Simple::Signal, from
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* https://testbit.eu/cpp11-signal-system-performance/
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*
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* Original license:
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* CC0 Public Domain
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* http://creativecommons.org/publicdomain/zero/1.0/
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*/
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using SignalToken = uint32_t;
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template<class... Args>
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struct Signal {
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using Callback = std::function<void (Args...)>;
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SignalToken operator+=(const Callback& callback) {
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const SignalToken token = next_token++;
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entries.emplace_back(std::make_unique<CallbackEntry>(callback, token));
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return token;
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}
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bool operator-=(const SignalToken token) {
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entries.remove_if([token](EntryType& entry) {
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return entry.get()->token == token;
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});
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return true;
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}
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void emit(Args... args) {
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for(auto& entry : entries) {
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entry.get()->callback(args...);
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};
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}
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private:
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struct CallbackEntry {
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const Callback callback;
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const SignalToken token;
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constexpr CallbackEntry(
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const Callback& callback,
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const SignalToken token
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) : callback { callback },
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token { token }
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{
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}
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};
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using EntryType = std::unique_ptr<CallbackEntry>;
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std::list<EntryType> entries { };
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SignalToken next_token = 1;
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};
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#endif/*__SIGNAL_H__*/
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