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/*
* Copyright 2021 The Android Open Source Project
*
* 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.
*/
#pragma once
#include <functional>
namespace android {
static inline void hashCombineSingleHashed(size_t& combinedHash, size_t hash) {
combinedHash = 31 * combinedHash + hash;
}
template<typename T>
static inline void hashCombineSingle(size_t& combinedHash, const T& val) {
hashCombineSingleHashed(combinedHash, std::hash<T>{}(val));
}
template<typename... Types>
static inline size_t hashCombine(const Types& ... args) {
size_t hash = 0;
( hashCombineSingle(hash, args), ... );
return hash;
}
} // namespace android
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