| /* |
| * 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 |
