Frobby 0.9.5
hash_fun.h
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1// 'struct hash' from SGI -*- C++ -*-
2
3// Copyright (C) 2001, 2002, 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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
61#ifndef _HASH_FUN_H
62#define _HASH_FUN_H 1
63
64#include <cstddef>
65#include <string>
66
67namespace __gnu_cxx {
68 using std::size_t;
69
70 template<class _Key>
71 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<>
83 struct hash<char*>
84 {
85 size_t
86 operator()(const char* __s) const
87 { return __stl_hash_string(__s); }
88 };
89
90 template<>
91 struct hash<const char*>
92 {
93 size_t
94 operator()(const char* __s) const
95 { return __stl_hash_string(__s); }
96 };
97
98 template<>
99 struct hash<string>
100 {
101 size_t
102 operator()(const string& str) const
103 { return __stl_hash_string(str.c_str()); }
104 };
105
106 template<>
107 struct hash<char>
108 {
109 size_t
110 operator()(char __x) const
111 { return __x; }
112 };
113
114 template<>
115 struct hash<unsigned char>
116 {
117 size_t
118 operator()(unsigned char __x) const
119 { return __x; }
120 };
121
122 template<>
123 struct hash<signed char>
124 {
125 size_t
126 operator()(unsigned char __x) const
127 { return __x; }
128 };
129
130 template<>
131 struct hash<short>
132 {
133 size_t
134 operator()(short __x) const
135 { return __x; }
136 };
137
138 template<>
139 struct hash<unsigned short>
140 {
141 size_t
142 operator()(unsigned short __x) const
143 { return __x; }
144 };
145
146 template<>
147 struct hash<int>
148 {
149 size_t
150 operator()(int __x) const
151 { return __x; }
152 };
153
154 template<>
155 struct hash<unsigned int>
156 {
157 size_t
158 operator()(unsigned int __x) const
159 { return __x; }
160 };
161
162 template<>
163 struct hash<long>
164 {
165 size_t
166 operator()(long __x) const
167 { return __x; }
168 };
169
170 template<>
171 struct hash<unsigned long>
172 {
173 size_t
174 operator()(unsigned long __x) const
175 { return __x; }
176 };
177}
178
179#endif
This file is a GNU extension to the Standard C++ Library (possibly containing extensions from the HP/...
Definition hash_fun.h:67
size_t __stl_hash_string(const char *__s)
Definition hash_fun.h:74
size_t operator()(char __x) const
Definition hash_fun.h:110
size_t operator()(const char *__s) const
Definition hash_fun.h:86
size_t operator()(const char *__s) const
Definition hash_fun.h:94
size_t operator()(int __x) const
Definition hash_fun.h:150
size_t operator()(long __x) const
Definition hash_fun.h:166
size_t operator()(short __x) const
Definition hash_fun.h:134
size_t operator()(unsigned char __x) const
Definition hash_fun.h:126
size_t operator()(const string &str) const
Definition hash_fun.h:102
size_t operator()(unsigned char __x) const
Definition hash_fun.h:118
size_t operator()(unsigned int __x) const
Definition hash_fun.h:158
size_t operator()(unsigned long __x) const
Definition hash_fun.h:174
size_t operator()(unsigned short __x) const
Definition hash_fun.h:142