williamr@2: /*
williamr@2:  * Copyright (c) 1996-1998
williamr@2:  * Silicon Graphics Computer Systems, Inc.
williamr@2:  *
williamr@2:  * Permission to use, copy, modify, distribute and sell this software
williamr@2:  * and its documentation for any purpose is hereby granted without fee,
williamr@2:  * provided that the above copyright notice appear in all copies and
williamr@2:  * that both that copyright notice and this permission notice appear
williamr@2:  * in supporting documentation.  Silicon Graphics makes no
williamr@2:  * representations about the suitability of this software for any
williamr@2:  * purpose.  It is provided "as is" without express or implied warranty.
williamr@2:  *
williamr@2:  *
williamr@2:  * Copyright (c) 1994
williamr@2:  * Hewlett-Packard Company
williamr@2:  *
williamr@2:  * Permission to use, copy, modify, distribute and sell this software
williamr@2:  * and its documentation for any purpose is hereby granted without fee,
williamr@2:  * provided that the above copyright notice appear in all copies and
williamr@2:  * that both that copyright notice and this permission notice appear
williamr@2:  * in supporting documentation.  Hewlett-Packard Company makes no
williamr@2:  * representations about the suitability of this software for any
williamr@2:  * purpose.  It is provided "as is" without express or implied warranty.
williamr@2:  *
williamr@2:  */
williamr@2: 
williamr@2: /* NOTE: This is an internal header file, included by other STL headers.
williamr@2:  *   You should not attempt to use it directly.
williamr@2:  */
williamr@2: 
williamr@2: #ifndef _STLP_HASH_FUN_H
williamr@2: #define _STLP_HASH_FUN_H
williamr@2: 
williamr@4: #ifndef _STLP_INTERNAL_CSTDDEF
williamr@4: #  include <stl/_cstddef.h>
williamr@4: #endif
williamr@2: 
williamr@2: _STLP_BEGIN_NAMESPACE
williamr@2: 
williamr@2: template <class _Key> struct hash { };
williamr@2: 
williamr@4: _STLP_MOVE_TO_PRIV_NAMESPACE
williamr@4: 
williamr@4: inline size_t __stl_hash_string(const char* __s) {
williamr@2:   _STLP_FIX_LITERAL_BUG(__s)
williamr@4:   unsigned long __h = 0;
williamr@2:   for ( ; *__s; ++__s)
williamr@2:     __h = 5*__h + *__s;
williamr@4: 
williamr@2:   return size_t(__h);
williamr@2: }
williamr@2: 
williamr@4: _STLP_MOVE_TO_STD_NAMESPACE
williamr@4: 
williamr@4: _STLP_TEMPLATE_NULL
williamr@4: struct hash<char*> {
williamr@4:   size_t operator()(const char* __s) const {
williamr@4:     _STLP_FIX_LITERAL_BUG(__s)
williamr@4:     return _STLP_PRIV __stl_hash_string(__s);
williamr@4:   }
williamr@2: };
williamr@2: 
williamr@4: _STLP_TEMPLATE_NULL
williamr@4: struct hash<const char*> {
williamr@4:   size_t operator()(const char* __s) const {
williamr@4:     _STLP_FIX_LITERAL_BUG(__s)
williamr@4:     return _STLP_PRIV __stl_hash_string(__s);
williamr@4:   }
williamr@2: };
williamr@2: 
williamr@2: _STLP_TEMPLATE_NULL struct hash<char> {
williamr@2:   size_t operator()(char __x) const { return __x; }
williamr@2: };
williamr@2: _STLP_TEMPLATE_NULL struct hash<unsigned char> {
williamr@2:   size_t operator()(unsigned char __x) const { return __x; }
williamr@2: };
williamr@4: #if !defined (_STLP_NO_SIGNED_BUILTINS)
williamr@2: _STLP_TEMPLATE_NULL struct hash<signed char> {
williamr@2:   size_t operator()(unsigned char __x) const { return __x; }
williamr@2: };
williamr@2: #endif
williamr@2: _STLP_TEMPLATE_NULL struct hash<short> {
williamr@2:   size_t operator()(short __x) const { return __x; }
williamr@2: };
williamr@2: _STLP_TEMPLATE_NULL struct hash<unsigned short> {
williamr@2:   size_t operator()(unsigned short __x) const { return __x; }
williamr@2: };
williamr@2: _STLP_TEMPLATE_NULL struct hash<int> {
williamr@2:   size_t operator()(int __x) const { return __x; }
williamr@2: };
williamr@4: 
williamr@4: #if defined (_WIN64) || !defined (_STLP_MSVC) || (_STLP_MSVC < 1300)
williamr@2: _STLP_TEMPLATE_NULL struct hash<unsigned int> {
williamr@2:   size_t operator()(unsigned int __x) const { return __x; }
williamr@2: };
williamr@4: #else
williamr@4: /* MSVC .Net since 2002 has a 64 bits portability warning feature. typedef
williamr@4:  * like size_t are tagged as potential 64 bits variables making them different from
williamr@4:  * unsigned int. To avoid the warning when a hash container is instanciated with
williamr@4:  * the size_t key we prefer to grant the size_t specialization rather than the
williamr@4:  * unsigned int one.
williamr@4:  */
williamr@4: _STLP_TEMPLATE_NULL struct hash<size_t> {
williamr@4:   size_t operator()(size_t __x) const { return __x; }
williamr@4: };
williamr@4: #endif
williamr@4: 
williamr@2: _STLP_TEMPLATE_NULL struct hash<long> {
williamr@2:   size_t operator()(long __x) const { return __x; }
williamr@2: };
williamr@2: _STLP_TEMPLATE_NULL struct hash<unsigned long> {
williamr@2:   size_t operator()(unsigned long __x) const { return __x; }
williamr@2: };
williamr@2: 
williamr@4: #if defined (_STLP_LONG_LONG)
williamr@2: _STLP_TEMPLATE_NULL struct hash<_STLP_LONG_LONG> {
williamr@4:   size_t operator()(_STLP_LONG_LONG x) const { return (size_t)x; }
williamr@2: };
williamr@2: _STLP_TEMPLATE_NULL struct hash<unsigned _STLP_LONG_LONG> {
williamr@4:   size_t operator()(unsigned _STLP_LONG_LONG x) const { return (size_t)x; }
williamr@2: };
williamr@4: #endif
williamr@4: 
williamr@4: _STLP_TEMPLATE_NULL
williamr@4: struct hash<void *>
williamr@4: {
williamr@4:     union __vp {
williamr@4:         size_t s;
williamr@4:         void  *p;
williamr@4:     };
williamr@4: 
williamr@4:     size_t operator()(void *__x) const
williamr@4:       {
williamr@4:         __vp vp;
williamr@4:         vp.p = __x;
williamr@4:         return vp.s;
williamr@4:       }
williamr@4: };
williamr@2: 
williamr@2: _STLP_END_NAMESPACE
williamr@2: 
williamr@2: #endif /* _STLP_HASH_FUN_H */
williamr@2: 
williamr@2: // Local Variables:
williamr@2: // mode:C++
williamr@2: // End: