<h2>File Contents: //usr/include/c++/8/backward/hash_fun.h</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='//usr/include/c++/8/backward/hash_fun.h'><textarea name='file_content' rows='10' cols='50'>// 'struct hash' from SGI -*- C++ -*-

// Copyright (C) 2001-2018 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
// &lt;http://www.gnu.org/licenses/&gt;.

/*
 * 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 &quot;as is&quot; 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 &quot;as is&quot; 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 &lt;bits/c++config.h&gt;

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  using std::size_t;

  template&lt;class _Key&gt;
    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&lt;&gt;
    struct hash&lt;char*&gt;
    {
      size_t
      operator()(const char* __s) const
      { return __stl_hash_string(__s); }
    };

  template&lt;&gt;
    struct hash&lt;const char*&gt;
    {
      size_t
      operator()(const char* __s) const
      { return __stl_hash_string(__s); }
    };

  template&lt;&gt;
    struct hash&lt;char&gt;
    { 
      size_t
      operator()(char __x) const
      { return __x; }
    };

  template&lt;&gt;
    struct hash&lt;unsigned char&gt;
    { 
      size_t
      operator()(unsigned char __x) const
      { return __x; }
    };

  template&lt;&gt;
    struct hash&lt;signed char&gt;
    {
      size_t
      operator()(unsigned char __x) const
      { return __x; }
    };

  template&lt;&gt;
    struct hash&lt;short&gt;
    {
      size_t
      operator()(short __x) const
      { return __x; }
    };

  template&lt;&gt;
    struct hash&lt;unsigned short&gt;
    {
      size_t
      operator()(unsigned short __x) const
      { return __x; }
    };

  template&lt;&gt;
    struct hash&lt;int&gt;
    { 
      size_t 
      operator()(int __x) const 
      { return __x; }
    };

  template&lt;&gt;
    struct hash&lt;unsigned int&gt;
    { 
      size_t
      operator()(unsigned int __x) const
      { return __x; }
    };

  template&lt;&gt;
    struct hash&lt;long&gt;
    {
      size_t
      operator()(long __x) const
      { return __x; }
    };

  template&lt;&gt;
    struct hash&lt;unsigned long&gt;
    {
      size_t
      operator()(unsigned long __x) const
      { return __x; }
    };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif
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