💿🐜 Antkeeper source code
https://antkeeper.com
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52 lines
1.7 KiB
52 lines
1.7 KiB
/*
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* Copyright (C) 2017-2019 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 ENTITY_GROUP_OBSERVER_HPP
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#define ENTITY_GROUP_OBSERVER_HPP
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#include "entity-group-member.hpp"
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/**
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* Abstract base class for entity group observers, which are notified each time a member is registered or unregistered from the group.
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*
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* @tparam T Set of components which are required for group membership.
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*/
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template <typename... T>
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class EntityGroupObserver
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{
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public:
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typedef EntityGroupMember<T...> Member;
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/**
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* Called each time an entity joins the entity group by obtaining the necessary component types.
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*
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* @param entity Entity ID of the new member.
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*/
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virtual void memberRegistered(const Member* member) = 0;
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/**
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* Called each time an entity leaves an the entity group by no longer possessing the necessary component types.
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*
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* @param entity Entity ID of the former member.
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*/
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virtual void memberUnregistered(const Member* member) = 0;
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};
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#endif // ENTITY_GROUP_OBSERVER_HPP
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