1 | // 'struct hash' from SGI -*- C++ -*- |
2 | |
3 | // Copyright (C) 2001-2017 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 3, 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 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version |
18 | // 3.1, as published by the Free Software Foundation. |
19 | |
20 | // You should have received a copy of the GNU General Public License and |
21 | // a copy of the GCC Runtime Library Exception along with this program; |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
23 | // <http://www.gnu.org/licenses/>. |
24 | |
25 | /* |
26 | * Copyright (c) 1996-1998 |
27 | * Silicon Graphics Computer Systems, Inc. |
28 | * |
29 | * Permission to use, copy, modify, distribute and sell this software |
30 | * and its documentation for any purpose is hereby granted without fee, |
31 | * provided that the above copyright notice appear in all copies and |
32 | * that both that copyright notice and this permission notice appear |
33 | * in supporting documentation. Silicon Graphics makes no |
34 | * representations about the suitability of this software for any |
35 | * purpose. It is provided "as is" without express or implied warranty. |
36 | * |
37 | * |
38 | * Copyright (c) 1994 |
39 | * Hewlett-Packard Company |
40 | * |
41 | * Permission to use, copy, modify, distribute and sell this software |
42 | * and its documentation for any purpose is hereby granted without fee, |
43 | * provided that the above copyright notice appear in all copies and |
44 | * that both that copyright notice and this permission notice appear |
45 | * in supporting documentation. Hewlett-Packard Company makes no |
46 | * representations about the suitability of this software for any |
47 | * purpose. It is provided "as is" without express or implied warranty. |
48 | * |
49 | */ |
50 | |
51 | /** @file backward/hash_fun.h |
52 | * This file is a GNU extension to the Standard C++ Library (possibly |
53 | * containing extensions from the HP/SGI STL subset). |
54 | */ |
55 | |
56 | #ifndef _BACKWARD_HASH_FUN_H |
57 | #define _BACKWARD_HASH_FUN_H 1 |
58 | |
59 | #include <bits/c++config.h> |
60 | |
61 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
62 | { |
63 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
64 | |
65 | using std::size_t; |
66 | |
67 | template<class _Key> |
68 | struct hash { }; |
69 | |
70 | inline size_t |
71 | __stl_hash_string(const char* __s) |
72 | { |
73 | unsigned long __h = 0; |
74 | for ( ; *__s; ++__s) |
75 | __h = 5 * __h + *__s; |
76 | return size_t(__h); |
77 | } |
78 | |
79 | template<> |
80 | struct hash<char*> |
81 | { |
82 | size_t |
83 | operator()(const char* __s) const |
84 | { return __stl_hash_string(__s); } |
85 | }; |
86 | |
87 | template<> |
88 | struct hash<const char*> |
89 | { |
90 | size_t |
91 | operator()(const char* __s) const |
92 | { return __stl_hash_string(__s); } |
93 | }; |
94 | |
95 | template<> |
96 | struct hash<char> |
97 | { |
98 | size_t |
99 | operator()(char __x) const |
100 | { return __x; } |
101 | }; |
102 | |
103 | template<> |
104 | struct hash<unsigned char> |
105 | { |
106 | size_t |
107 | operator()(unsigned char __x) const |
108 | { return __x; } |
109 | }; |
110 | |
111 | template<> |
112 | struct hash<signed char> |
113 | { |
114 | size_t |
115 | operator()(unsigned char __x) const |
116 | { return __x; } |
117 | }; |
118 | |
119 | template<> |
120 | struct hash<short> |
121 | { |
122 | size_t |
123 | operator()(short __x) const |
124 | { return __x; } |
125 | }; |
126 | |
127 | template<> |
128 | struct hash<unsigned short> |
129 | { |
130 | size_t |
131 | operator()(unsigned short __x) const |
132 | { return __x; } |
133 | }; |
134 | |
135 | template<> |
136 | struct hash<int> |
137 | { |
138 | size_t |
139 | operator()(int __x) const |
140 | { return __x; } |
141 | }; |
142 | |
143 | template<> |
144 | struct hash<unsigned int> |
145 | { |
146 | size_t |
147 | operator()(unsigned int __x) const |
148 | { return __x; } |
149 | }; |
150 | |
151 | template<> |
152 | struct hash<long> |
153 | { |
154 | size_t |
155 | operator()(long __x) const |
156 | { return __x; } |
157 | }; |
158 | |
159 | template<> |
160 | struct hash<unsigned long> |
161 | { |
162 | size_t |
163 | operator()(unsigned long __x) const |
164 | { return __x; } |
165 | }; |
166 | |
167 | _GLIBCXX_END_NAMESPACE_VERSION |
168 | } // namespace |
169 | |
170 | #endif |
171 | |