/*

 * Copyright (c) 1997-1999

 * Silicon Graphics Computer Systems, Inc.

 *

 * Copyright (c) 1999

 * Boris Fomitchev

 *

 * This material is provided "as is", with absolutely no warranty expressed

 * or implied. Any use is at your own risk.

 *

 * Permission to use or copy this software for any purpose is hereby granted

 * without fee, provided the above notices are retained on all copies.

 * Permission to modify the code and to distribute modified code is granted,

 * provided the above notices are retained, and a notice that the code was

 * modified is included with the above copyright notice.

 *

 */

#ifndef _STLP_STRING_HASH_H

#define _STLP_STRING_HASH_H

#ifndef _STLP_HASH_FUN_H

# include <stl/_hash_fun.h>

#endif

#ifndef _STLP_INTERNAL_STRING_H

# include <stl/_string.h>

#endif

_STLP_BEGIN_NAMESPACE

template <class _CharT, class _Traits, class _Alloc>

_STLP_INLINE_LOOP size_t

__stl_string_hash(const basic_string<_CharT,_Traits,_Alloc>& __s) {

  unsigned long __h = 0;

  size_t __len = __s.size();

  const _CharT* __data = __s.data();

  for ( size_t __i = 0; __i < __len; ++__i)

    __h = /* 5 *__h */(__h << 2) + __h + __data[__i];

  return size_t(__h);

}

#if defined (_STLP_CLASS_PARTIAL_SPECIALIZATION)

template <class _CharT, class _Traits, class _Alloc>

struct hash<basic_string<_CharT,_Traits,_Alloc> > {

  size_t operator()(const basic_string<_CharT,_Traits,_Alloc>& __s) const

    { return __stl_string_hash(__s); }

};

#else

_STLP_TEMPLATE_NULL

struct _STLP_CLASS_DECLSPEC hash<string> {

  size_t operator()(const string& __s) const

    { return __stl_string_hash(__s); }

};

#  if defined (_STLP_HAS_WCHAR_T)

_STLP_TEMPLATE_NULL

struct _STLP_CLASS_DECLSPEC hash<wstring> {

  size_t operator()(const wstring& __s) const

    { return __stl_string_hash(__s); }

};

#  endif

#endif /* _STLP_CLASS_PARTIAL_SPECIALIZATION */

_STLP_END_NAMESPACE

#endif