1// -*- C++ -*- 2 3// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the terms 7// of the GNU General Public License as published by the Free Software 8// Foundation; either version 3, or (at your option) any later 9// version. 10 11// This library is distributed in the hope that it will be useful, but 12// WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14// General Public License for more details. 15 16// You should have received a copy of the GNU General Public License 17// along with this library; see the file COPYING3. If not see 18// <http://www.gnu.org/licenses/>. 19 20 21// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 22 23// Permission to use, copy, modify, sell, and distribute this software 24// is hereby granted without fee, provided that the above copyright 25// notice appears in all copies, and that both that copyright notice 26// and this permission notice appear in supporting documentation. None 27// of the above authors, nor IBM Haifa Research Laboratories, make any 28// representation about the suitability of this software for any 29// purpose. It is provided "as is" without express or implied 30// warranty. 31 32/** 33 * @file string_hash_fn.hpp 34 * Contains a string hash function. 35 */ 36 37#ifndef PB_DS_STRING_HASH_FN_HPP 38#define PB_DS_STRING_HASH_FN_HPP 39 40#include <string> 41 42namespace __gnu_pbds 43{ 44 namespace test 45 { 46 struct string_hash_fn 47 { 48 template<typename String_T> 49 inline size_t 50 operator()(const String_T& r_str) const 51 { 52 typedef typename String_T::const_iterator const_iterator; 53 const_iterator b = r_str.begin(); 54 const_iterator e = r_str.end(); 55 56 size_t ret = 0; 57 while (b != e) 58 { 59 ret *= 5; 60 ret += static_cast<size_t>(*(b++)); 61 } 62 return ret; 63 } 64 }; 65 } // namespace test 66} // namespace __gnu_pbds 67 68#endif 69