summaryrefslogtreecommitdiff
path: root/libstdc++-v3/include/backward/hash_fun.h
blob: a76eb730101eabdfe015e092b948eb7f016b4c9a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
// 'struct hash' from SGI -*- C++ -*-

// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009, 2010
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/*
 * Copyright (c) 1996-1998
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 */

/** @file backward/hash_fun.h
 *  This file is a GNU extension to the Standard C++ Library (possibly
 *  containing extensions from the HP/SGI STL subset).
 */

#ifndef _BACKWARD_HASH_FUN_H
#define _BACKWARD_HASH_FUN_H 1

#include <bits/c++config.h>

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  using std::size_t;

  template<class _Key>
    struct hash { };

  inline size_t
  __stl_hash_string(const char* __s)
  {
    unsigned long __h = 0;
    for ( ; *__s; ++__s)
      __h = 5 * __h + *__s;
    return size_t(__h);
  }

  template<>
    struct hash<char*>
    {
      size_t
      operator()(const char* __s) const
      { return __stl_hash_string(__s); }
    };

  template<>
    struct hash<const char*>
    {
      size_t
      operator()(const char* __s) const
      { return __stl_hash_string(__s); }
    };

  template<>
    struct hash<char>
    { 
      size_t
      operator()(char __x) const
      { return __x; }
    };

  template<>
    struct hash<unsigned char>
    { 
      size_t
      operator()(unsigned char __x) const
      { return __x; }
    };

  template<>
    struct hash<signed char>
    {
      size_t
      operator()(unsigned char __x) const
      { return __x; }
    };

  template<>
    struct hash<short>
    {
      size_t
      operator()(short __x) const
      { return __x; }
    };

  template<>
    struct hash<unsigned short>
    {
      size_t
      operator()(unsigned short __x) const
      { return __x; }
    };

  template<>
    struct hash<int>
    { 
      size_t 
      operator()(int __x) const 
      { return __x; }
    };

  template<>
    struct hash<unsigned int>
    { 
      size_t
      operator()(unsigned int __x) const
      { return __x; }
    };

  template<>
    struct hash<long>
    {
      size_t
      operator()(long __x) const
      { return __x; }
    };

  template<>
    struct hash<unsigned long>
    {
      size_t
      operator()(unsigned long __x) const
      { return __x; }
    };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif