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71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
/*
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* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TRINITY_COMMONPREDICATES_H
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#define TRINITY_COMMONPREDICATES_H
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#include "Define.h"
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#include <utility>
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class Unit;
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class WorldObject;
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namespace Trinity
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{
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namespace Predicates
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{
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/// Only returns true for the given attacker's current victim, if any
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class TC_GAME_API IsVictimOf
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{
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public:
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IsVictimOf(Unit const* attacker);
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bool operator()(WorldObject const* obj) const { return obj && (_victim == obj); }
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private:
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WorldObject const* _victim;
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};
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template <typename PRED>
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class TC_GAME_API Inverter
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{
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public:
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Inverter(PRED&& p) : _child(std::move(p)) { }
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template <typename... Args>
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bool operator()(Args&&... args)
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{
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return !_child(std::forward<Args>(args)...);
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}
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template <typename... Args>
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bool operator()(Args&&... args) const
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{
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return !_child(std::forward<Args>(args)...);
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}
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private:
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PRED _child;
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};
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template <typename PRED>
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/// Inverts the given predicate to return the opposite result
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Inverter<PRED> Invert(PRED&& p) { return Inverter<PRED>(std::forward<PRED>(p)); }
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}
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}
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#endif //TRINITY_COMMONPREDICATES_H
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