CommonPredicates.h

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef TRINITY_COMMONPREDICATES_H
#define TRINITY_COMMONPREDICATES_H
 
#include "Define.h"
#include <utility>
 
class Unit;
class WorldObject;
 
enum Powers : int8;
 
namespace Trinity
{
 namespace Predicates
 {
 class TC_GAME_API IsVictimOf
 {
 public:
 IsVictimOf(Unit const* attacker);
 bool operator()(WorldObject const* obj) const { return obj && (_victim == obj); }
 private:
 WorldObject const* _victim;
 };
 
 class TC_GAME_API PowerPctOrderPred
 {
 public:
 PowerPctOrderPred(Powers power, bool ascending = true) : _power(power), _ascending(ascending) { }
 
 bool operator()(WorldObject const* objA, WorldObject const* objB) const;
 bool operator()(Unit const* a, Unit const* b) const;
 
 private:
 Powers const _power;
 bool const _ascending;
 };
 
 class TC_GAME_API HealthPctOrderPred
 {
 public:
 HealthPctOrderPred(bool ascending = true) : _ascending(ascending) { }
 
 bool operator()(WorldObject const* objA, WorldObject const* objB) const;
 bool operator() (Unit const* a, Unit const* b) const;
 
 private:
 bool const _ascending;
 };
 
 template <typename PRED>
 class TC_GAME_API Inverter
 {
 public:
 Inverter(PRED&& p) : _child(std::move(p)) { }
 
 template <typename... Args>
 bool operator()(Args&&... args)
 {
 return !_child(std::forward<Args>(args)...);
 }
 
 template <typename... Args>
 bool operator()(Args&&... args) const
 {
 return !_child(std::forward<Args>(args)...);
 }
 
 private:
 PRED _child;
 };
 
 template <typename PRED>
 Inverter<PRED> Invert(PRED&& p) { return Inverter<PRED>(std::forward<PRED>(p)); }
 }
}
 
#endif //TRINITY_COMMONPREDICATES_H