38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
/*
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* Copyright 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <functional>
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namespace android {
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static inline void hashCombineSingleHashed(size_t& combinedHash, size_t hash) {
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combinedHash = 31 * combinedHash + hash;
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}
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template<typename T>
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static inline void hashCombineSingle(size_t& combinedHash, const T& val) {
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hashCombineSingleHashed(combinedHash, std::hash<T>{}(val));
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}
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template<typename... Types>
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static inline size_t hashCombine(const Types& ... args) {
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size_t hash = 0;
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( hashCombineSingle(hash, args), ... );
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return hash;
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}
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} // namespace android
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