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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 TrinityCore_Hash_h__
#define TrinityCore_Hash_h__
#include <functional>
#include <utility>
namespace Trinity
{
template<typename T>
inline void hash_combine(std::size_t& seed, T const& val)
{
seed ^= std::hash<T>()(val) + 0x9E3779B9 + (seed << 6) + (seed >> 2);
}
}
//! Hash implementation for std::pair to allow using pairs in unordered_set or as key for unordered_map
//! Individual types used in pair must be hashable by std::hash
template<class K, class V>
struct std::hash<std::pair<K, V>>
{
public:
size_t operator()(std::pair<K, V> const& p) const
{
size_t hashVal = 0;
Trinity::hash_combine(hashVal, p.first);
Trinity::hash_combine(hashVal, p.second);
return hashVal;
}
};
#endif // TrinityCore_Hash_h__
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