48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
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/*
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* Copyright 2011, Ben Langmead <langmea@cs.jhu.edu>
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*
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* This file is part of Bowtie 2.
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*
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* Bowtie 2 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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*
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* Bowtie 2 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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*
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* You should have received a copy of the GNU General Public License
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* along with Bowtie 2. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef STR_UTIL_H_
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#define STR_UTIL_H_
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#include <string>
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/**
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* Given a string, return an int hash for it.
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*/
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static inline int
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hash_string(const std::string& s) {
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int ret = 0;
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int a = 63689;
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int b = 378551;
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for(size_t i = 0; i < s.length(); i++) {
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ret = (ret * a) + (int)s[i];
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if(a == 0) {
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a += b;
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} else {
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a *= b;
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}
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if(a == 0) {
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a += b;
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}
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}
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return ret;
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}
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#endif /* STR_UTIL_H_ */
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