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72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
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/*
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* Copyright (c) 1997-1999
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* Silicon Graphics Computer Systems, Inc.
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*
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* Copyright (c) 1999
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* Boris Fomitchev
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*
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* This material is provided "as is", with absolutely no warranty expressed
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* or implied. Any use is at your own risk.
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*
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* Permission to use or copy this software for any purpose is hereby granted
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* without fee, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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*/
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#ifndef _STLP_STRING_HASH_H
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#define _STLP_STRING_HASH_H
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#ifndef _STLP_HASH_FUN_H
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# include <stl/_hash_fun.h>
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#endif
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#ifndef _STLP_INTERNAL_STRING_H
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# include <stl/_string.h>
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#endif
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_STLP_BEGIN_NAMESPACE
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template <class _CharT, class _Traits, class _Alloc>
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_STLP_INLINE_LOOP size_t
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__stl_string_hash(const basic_string<_CharT,_Traits,_Alloc>& __s) {
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unsigned long __h = 0;
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size_t __len = __s.size();
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const _CharT* __data = __s.data();
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for ( size_t __i = 0; __i < __len; ++__i)
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__h = /* 5 *__h */(__h << 2) + __h + __data[__i];
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return size_t(__h);
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}
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#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION) && \
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(!defined(__BORLANDC__) || (__BORLANDC__ >= 0x560))
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template <class _CharT, class _Traits, class _Alloc>
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struct hash<basic_string<_CharT,_Traits,_Alloc> > {
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size_t operator()(const basic_string<_CharT,_Traits,_Alloc>& __s) const
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{ return __stl_string_hash(__s); }
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};
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#else
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_STLP_TEMPLATE_NULL
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struct _STLP_CLASS_DECLSPEC hash<string> {
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size_t operator()(const string& __s) const
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{ return __stl_string_hash(__s); }
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};
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# if defined (_STLP_HAS_WCHAR_T)
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_STLP_TEMPLATE_NULL
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struct _STLP_CLASS_DECLSPEC hash<wstring> {
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size_t operator()(const wstring& __s) const
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{ return __stl_string_hash(__s); }
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};
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# endif
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#endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */
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_STLP_END_NAMESPACE
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#endif
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