1/*
2 * Copyright (c) 1996-1998
3 * Silicon Graphics Computer Systems, Inc.
4 *
5 * Permission to use, copy, modify, distribute and sell this software
6 * and its documentation for any purpose is hereby granted without fee,
7 * provided that the above copyright notice appear in all copies and
8 * that both that copyright notice and this permission notice appear
9 * in supporting documentation.  Silicon Graphics makes no
10 * representations about the suitability of this software for any
11 * purpose.  It is provided "as is" without express or implied warranty.
12 *
13 *
14 * Copyright (c) 1994
15 * Hewlett-Packard Company
16 *
17 * Permission to use, copy, modify, distribute and sell this software
18 * and its documentation for any purpose is hereby granted without fee,
19 * provided that the above copyright notice appear in all copies and
20 * that both that copyright notice and this permission notice appear
21 * in supporting documentation.  Hewlett-Packard Company makes no
22 * representations about the suitability of this software for any
23 * purpose.  It is provided "as is" without express or implied warranty.
24 *
25 */
26
27/* NOTE: This is an internal header file, included by other STL headers.
28 *   You should not attempt to use it directly.
29 */
30
31#ifndef _STLP_HASH_FUN_H
32#define _STLP_HASH_FUN_H
33
34#ifndef _STLP_INTERNAL_CSTDDEF
35#  include <stl/_cstddef.h>
36#endif
37
38_STLP_BEGIN_NAMESPACE
39
40template <class _Key> struct hash { };
41
42_STLP_MOVE_TO_PRIV_NAMESPACE
43
44inline size_t __stl_hash_string(const char* __s) {
45  _STLP_FIX_LITERAL_BUG(__s)
46  unsigned long __h = 0;
47  for ( ; *__s; ++__s)
48    __h = 5*__h + *__s;
49
50  return size_t(__h);
51}
52
53_STLP_MOVE_TO_STD_NAMESPACE
54
55_STLP_TEMPLATE_NULL
56struct hash<char*> {
57  size_t operator()(const char* __s) const {
58    _STLP_FIX_LITERAL_BUG(__s)
59    return _STLP_PRIV __stl_hash_string(__s);
60  }
61};
62
63_STLP_TEMPLATE_NULL
64struct hash<const char*> {
65  size_t operator()(const char* __s) const {
66    _STLP_FIX_LITERAL_BUG(__s)
67    return _STLP_PRIV __stl_hash_string(__s);
68  }
69};
70
71_STLP_TEMPLATE_NULL struct hash<char> {
72  size_t operator()(char __x) const { return __x; }
73};
74_STLP_TEMPLATE_NULL struct hash<unsigned char> {
75  size_t operator()(unsigned char __x) const { return __x; }
76};
77#if !defined (_STLP_NO_SIGNED_BUILTINS)
78_STLP_TEMPLATE_NULL struct hash<signed char> {
79  size_t operator()(unsigned char __x) const { return __x; }
80};
81#endif
82_STLP_TEMPLATE_NULL struct hash<short> {
83  size_t operator()(short __x) const { return __x; }
84};
85_STLP_TEMPLATE_NULL struct hash<unsigned short> {
86  size_t operator()(unsigned short __x) const { return __x; }
87};
88_STLP_TEMPLATE_NULL struct hash<int> {
89  size_t operator()(int __x) const { return __x; }
90};
91
92#if !defined (_STLP_MSVC) || (_STLP_MSVC < 1300) || defined (_WIN64)
93_STLP_TEMPLATE_NULL struct hash<unsigned int> {
94  size_t operator()(unsigned int __x) const { return __x; }
95};
96#else
97/* MSVC .Net since 2002 has a 64 bits portability warning feature. typedef
98 * like size_t are tagged as potential 64 bits variables making them different from
99 * unsigned int. To avoid the warning when a hash container is instanciated with
100 * the size_t key we prefer to grant the size_t specialization rather than the
101 * unsigned int one.
102 */
103_STLP_TEMPLATE_NULL struct hash<size_t> {
104  size_t operator()(size_t __x) const { return __x; }
105};
106#endif
107
108_STLP_TEMPLATE_NULL struct hash<long> {
109  size_t operator()(long __x) const { return __x; }
110};
111_STLP_TEMPLATE_NULL struct hash<unsigned long> {
112  size_t operator()(unsigned long __x) const { return __x; }
113};
114
115#if defined (_STLP_LONG_LONG)
116_STLP_TEMPLATE_NULL struct hash<_STLP_LONG_LONG> {
117  size_t operator()(_STLP_LONG_LONG x) const { return (size_t)x; }
118};
119_STLP_TEMPLATE_NULL struct hash<unsigned _STLP_LONG_LONG> {
120  size_t operator()(unsigned _STLP_LONG_LONG x) const { return (size_t)x; }
121};
122#endif
123
124_STLP_TEMPLATE_NULL
125struct hash<void *>
126{
127    union __vp {
128        size_t s;
129        void  *p;
130    };
131
132    size_t operator()(void *__x) const
133      {
134        __vp vp;
135        vp.p = __x;
136        return vp.s;
137      }
138};
139
140_STLP_END_NAMESPACE
141
142#endif /* _STLP_HASH_FUN_H */
143
144// Local Variables:
145// mode:C++
146// End:
147