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