hash.h

/******************************************************************************
 * Copyright 2022 ETC Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************
 * This file is a part of EtcPal. For more information, go to:
 * https://github.com/ETCLabs/EtcPal
 ******************************************************************************/
 
 
#ifndef ETCPAL_CPP_HASH_H_
#define ETCPAL_CPP_HASH_H_
 
#include <cstddef>
#include <functional>
 
namespace etcpal
{
 
template <class T>
inline void HashCombine(size_t& seed, const T& val)
{
  std::hash<T> hasher;
  seed ^= hasher(val) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}
 
};  // namespace etcpal
 
#endif /* ETCPAL_CPP_HASH_H_ */