forked from huawei/mindspore2022
37 lines
1.3 KiB
C++
37 lines
1.3 KiB
C++
/**
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* Copyright 2019 Huawei Technologies Co., Ltd
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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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#ifndef MINDSPORE_CCSRC_UTILS_HASHING_H_
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#define MINDSPORE_CCSRC_UTILS_HASHING_H_
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#include <initializer_list>
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namespace mindspore {
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inline std::size_t hash_combine(std::size_t hash_sum, std::size_t hash_val) {
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// Reference from http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0814r0.pdf
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return ((hash_sum << 6) + (hash_sum >> 2) + 0x9e3779b9 + hash_val) ^ hash_sum;
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}
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inline std::size_t hash_combine(const std::initializer_list<std::size_t>& hash_vals) {
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std::size_t hash_sum = 0;
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for (auto hash_val : hash_vals) {
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hash_sum = hash_combine(hash_sum, hash_val);
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}
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return hash_sum;
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}
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} // namespace mindspore
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#endif // MINDSPORE_CCSRC_UTILS_HASHING_H_
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