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// 'struct hash' from SGI -*- C++ -*-

// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009, 2010

// Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

/*

 * Copyright (c) 1996-1998

 * 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.

 *

 */

/** @file backward/hash_fun.h

 *  This file is a GNU extension to the Standard C++ Library (possibly

 *  containing extensions from the HP/SGI STL subset).

 */

#ifndef _BACKWARD_HASH_FUN_H

#define _BACKWARD_HASH_FUN_H 1

#include <cstddef>

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

  using std::size_t;

  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);

  }

  template<>

    struct hash<char*>

    {

      size_t

      operator()(const char* __s) const

      { return __stl_hash_string(__s); }

    };

  template<>

    struct hash<const char*>

    {

      size_t

      operator()(const char* __s) const

      { return __stl_hash_string(__s); }

    };

  template<>

    struct hash<char>

    {

      size_t

      operator()(char __x) const

      { return __x; }

    };

  template<>

    struct hash<unsigned char>

    {

      size_t

      operator()(unsigned char __x) const

      { return __x; }

    };

  template<>

    struct hash<signed char>

    {

      size_t

      operator()(unsigned char __x) const

      { return __x; }

    };

  template<>

    struct hash<short>

    {

      size_t

      operator()(short __x) const

      { return __x; }

    };

  template<>

    struct hash<unsigned short>

    {

      size_t

      operator()(unsigned short __x) const

      { return __x; }

    };

  template<>

    struct hash<int>

    {

      size_t

      operator()(int __x) const

      { return __x; }

    };

  template<>

    struct hash<unsigned int>

    {

      size_t

      operator()(unsigned int __x) const

      { return __x; }

    };

  template<>

    struct hash<long>

    {

      size_t

      operator()(long __x) const

      { return __x; }

    };

  template<>

    struct hash<unsigned long>

    {

      size_t

      operator()(unsigned long __x) const

      { return __x; }

    };

_GLIBCXX_END_NAMESPACE

#endif