💿🐜 Antkeeper source code
https://antkeeper.com
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88 lines
2.3 KiB
88 lines
2.3 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code 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 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code 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 Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_EVENT_HPP
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#define ANTKEEPER_EVENT_HPP
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#include <atomic>
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#include <cstdlib>
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/**
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* Abstract base class for events.
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*/
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class event_base
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{
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public:
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/// Destroys an event base.
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virtual ~event_base() = default;
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/// Returns the unique event type identifier for this event type.
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virtual const std::size_t get_event_type_id() const = 0;
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/**
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* Allocates a copy of this event.
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*
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* @return Newly allocated copy of this event.
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*/
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virtual event_base* clone() const = 0;
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protected:
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/// Returns then increments the next available event type ID.
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static std::size_t next_event_type_id();
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};
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inline std::size_t event_base::next_event_type_id()
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{
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static std::atomic<std::size_t> next_event_type_id{0};
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return next_event_type_id++;
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}
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/**
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* Templated abstract base class for events.
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*
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* @tparam T The derived class.
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*/
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template <typename T>
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class event: public event_base
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{
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public:
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/// The unique event type identifier for this event type.
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static const std::atomic<std::size_t> event_type_id;
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/// Destroys an event
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virtual ~event() = default;
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/// @copydoc event_base::get_event_type_id() const
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virtual const std::size_t get_event_type_id() const final;
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/// @copydoc event_base::clone() const
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virtual event_base* clone() const = 0;
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};
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template <typename T>
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const std::atomic<std::size_t> event<T>::event_type_id{event_base::next_event_type_id()};
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template <typename T>
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inline const std::size_t event<T>::get_event_type_id() const
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{
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return event_type_id;
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}
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#endif // ANTKEEPER_EVENT_HPP
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