46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
/**
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This file is a part of rexy's general purpose library
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Copyright (C) 2020 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef REXY_STRING_HASH_HPP
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#define REXY_STRING_HASH_HPP
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#include "rexy.hpp"
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namespace rexy{
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//jenkns one at a time hash
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template<class Str>
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struct string_hash{
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constexpr size_t operator()(const Str& s, size_t salt = 0)const noexcept{
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size_t hash = salt;
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for(size_t i = 0;i < s.length();++i){
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hash += s[i];
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hash += (hash << 10);
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hash += (hash >> 6);
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}
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hash += (hash << 3);
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hash ^= (hash << 11);
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hash += (hash << 15);
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return hash;
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}
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};
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}
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#endif
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