Merge branch 'master' of ssh://crater.dragonflybsd.org/repository/git/dragonfly
[dragonfly.git] / contrib / gcc-3.4 / libstdc++-v3 / include / ext / hash_fun.h
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1// 'struct hash' from SGI -*- C++ -*-
2
3// Copyright (C) 2001, 2002, 2003 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
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 2, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// You should have received a copy of the GNU General Public License along
17// with this library; see the file COPYING. If not, write to the Free
18// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
19// USA.
20
21// As a special exception, you may use this file as part of a free software
22// library without restriction. Specifically, if other files instantiate
23// templates or use macros or inline functions from this file, or you compile
24// this file and link it with other files to produce an executable, this
25// file does not by itself cause the resulting executable to be covered by
26// the GNU General Public License. This exception does not however
27// invalidate any other reasons why the executable file might be covered by
28// the GNU General Public License.
29
30/*
31 * Copyright (c) 1996-1998
32 * Silicon Graphics Computer Systems, Inc.
33 *
34 * Permission to use, copy, modify, distribute and sell this software
35 * and its documentation for any purpose is hereby granted without fee,
36 * provided that the above copyright notice appear in all copies and
37 * that both that copyright notice and this permission notice appear
38 * in supporting documentation. Silicon Graphics makes no
39 * representations about the suitability of this software for any
40 * purpose. It is provided "as is" without express or implied warranty.
41 *
42 *
43 * Copyright (c) 1994
44 * Hewlett-Packard Company
45 *
46 * Permission to use, copy, modify, distribute and sell this software
47 * and its documentation for any purpose is hereby granted without fee,
48 * provided that the above copyright notice appear in all copies and
49 * that both that copyright notice and this permission notice appear
50 * in supporting documentation. Hewlett-Packard Company makes no
51 * representations about the suitability of this software for any
52 * purpose. It is provided "as is" without express or implied warranty.
53 *
54 */
55
56/** @file ext/hash_fun.h
57 * This file is a GNU extension to the Standard C++ Library (possibly
58 * containing extensions from the HP/SGI STL subset). You should only
59 * include this header if you are using GCC 3 or later.
60 */
61
62#ifndef _HASH_FUN_H
63#define _HASH_FUN_H 1
64
65#include <cstddef>
66
67namespace __gnu_cxx
68{
69 using std::size_t;
70
71 template <class _Key> struct hash { };
72
73 inline size_t
74 __stl_hash_string(const char* __s)
75 {
76 unsigned long __h = 0;
77 for ( ; *__s; ++__s)
78 __h = 5*__h + *__s;
79 return size_t(__h);
80 }
81
82 template<> struct hash<char*>
83 {
84 size_t operator()(const char* __s) const
85 { return __stl_hash_string(__s); }
86 };
87
88 template<> struct hash<const char*>
89 {
90 size_t operator()(const char* __s) const
91 { return __stl_hash_string(__s); }
92 };
93
94 template<> struct hash<char>
95 { size_t operator()(char __x) const { return __x; } };
96
97 template<> struct hash<unsigned char>
98 { size_t operator()(unsigned char __x) const { return __x; } };
99
100 template<> struct hash<signed char>
101 { size_t operator()(unsigned char __x) const { return __x; } };
102
103 template<> struct hash<short>
104 { size_t operator()(short __x) const { return __x; } };
105
106 template<> struct hash<unsigned short>
107 { size_t operator()(unsigned short __x) const { return __x; } };
108
109 template<> struct hash<int>
110 { size_t operator()(int __x) const { return __x; } };
111
112 template<> struct hash<unsigned int>
113 { size_t operator()(unsigned int __x) const { return __x; } };
114
115 template<> struct hash<long>
116 { size_t operator()(long __x) const { return __x; } };
117
118 template<> struct hash<unsigned long>
119 { size_t operator()(unsigned long __x) const { return __x; } };
120} // namespace __gnu_cxx
121
122#endif