/*=========================================================================

  Program:   KWSys - Kitware System Library
  Module:    $RCSfile: hash_fun.hxx.in,v $

  Copyright (c) Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
/*
 * Copyright (c) 1996
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 */
#ifndef itksys_hash_fun_hxx
#define itksys_hash_fun_hxx

#include <itksys/Configure.hxx>

#include <itksys/cstddef>        // size_t

namespace itksys
{

template <class _Key> struct hash { };

inline size_t _stl_hash_string(const char* __s)
{
  unsigned long __h = 0;
  for ( ; *__s; ++__s)
    __h = 5*__h + *__s;

  return size_t(__h);
}

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<char*> {
  size_t operator()(const char* __s) const { return _stl_hash_string(__s); }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<const char*> {
  size_t operator()(const char* __s) const { return _stl_hash_string(__s); }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<char> {
  size_t operator()(char __x) const { return __x; }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<unsigned char> {
  size_t operator()(unsigned char __x) const { return __x; }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<signed char> {
  size_t operator()(unsigned char __x) const { return __x; }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<short> {
  size_t operator()(short __x) const { return __x; }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<unsigned short> {
  size_t operator()(unsigned short __x) const { return __x; }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<int> {
  size_t operator()(int __x) const { return __x; }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<unsigned int> {
  size_t operator()(unsigned int __x) const { return __x; }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<long> {
  size_t operator()(long __x) const { return __x; }
};

itksys_CXX_DEFINE_SPECIALIZATION
struct hash<unsigned long> {
  size_t operator()(unsigned long __x) const { return __x; }
};

} // namespace itksys

#endif
