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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
{
/// Only returns true for the given attacker's current victim, if any
class TC_GAME_API IsVictimOf
{
public:
IsVictimOf(Unit const* attacker);
bool operator()(WorldObject const* obj) const { return obj && (_victim == obj); }
private:
WorldObject const* _victim;
};
/// Binary predicate for sorting Units based on percent value of a power
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;
};
/// Binary predicate for sorting Units based on percent value of health
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>
/// Inverts the given predicate to return the opposite result
Inverter<PRED> Invert(PRED&& p) { return Inverter<PRED>(std::forward<PRED>(p)); }
}
}
#endif //TRINITY_COMMONPREDICATES_H
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