headers/cpp/stl_hash_fun.h

   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 __SGI_STL_HASH_FUN_H
  32 #define __SGI_STL_HASH_FUN_H
  33
  34 #include <stddef.h>
  35
  36 __STL_BEGIN_NAMESPACE
  37
  38 template <class _Key> struct hash { };
  39
  40 inline size_t __stl_hash_string(const char* __s)
  41 {
  42   unsigned long __h = 0;
  43   for ( ; *__s; ++__s)
  44     __h = 5*__h + *__s;
  45
  46   return size_t(__h);
  47 }
  48
  49 __STL_TEMPLATE_NULL struct hash<char*>
  50 {
  51   size_t operator()(const char* __s) const { return __stl_hash_string(__s); }
  52 };
  53
  54 __STL_TEMPLATE_NULL struct hash<const char*>
  55 {
  56   size_t operator()(const char* __s) const { return __stl_hash_string(__s); }
  57 };
  58
  59 __STL_TEMPLATE_NULL struct hash<char> {
  60   size_t operator()(char __x) const { return __x; }
  61 };
  62 __STL_TEMPLATE_NULL struct hash<unsigned char> {
  63   size_t operator()(unsigned char __x) const { return __x; }
  64 };
  65 __STL_TEMPLATE_NULL struct hash<signed char> {
  66   size_t operator()(unsigned char __x) const { return __x; }
  67 };
  68 __STL_TEMPLATE_NULL struct hash<short> {
  69   size_t operator()(short __x) const { return __x; }
  70 };
  71 __STL_TEMPLATE_NULL struct hash<unsigned short> {
  72   size_t operator()(unsigned short __x) const { return __x; }
  73 };
  74 __STL_TEMPLATE_NULL struct hash<int> {
  75   size_t operator()(int __x) const { return __x; }
  76 };
  77 __STL_TEMPLATE_NULL struct hash<unsigned int> {
  78   size_t operator()(unsigned int __x) const { return __x; }
  79 };
  80 __STL_TEMPLATE_NULL struct hash<long> {
  81   size_t operator()(long __x) const { return __x; }
  82 };
  83 __STL_TEMPLATE_NULL struct hash<unsigned long> {
  84   size_t operator()(unsigned long __x) const { return __x; }
  85 };
  86
  87 __STL_END_NAMESPACE
  88
  89 #endif /* __SGI_STL_HASH_FUN_H */
  90
  91 // Local Variables:
  92 // mode:C++
  93 // End: