<h2>Editing File: /usr/include/c++/8/tr1/utility</h2><form method='post'><textarea name='content' class='file-edit'>// TR1 utility -*- C++ -*-

// Copyright (C) 2004-2018 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;.

/** @file tr1/utility
 *  This is a TR1 C++ Library header. 
 */

#ifndef _GLIBCXX_TR1_UTILITY
#define _GLIBCXX_TR1_UTILITY 1

#pragma GCC system_header

#include &lt;bits/c++config.h&gt;
#include &lt;bits/stl_relops.h&gt;
#include &lt;bits/stl_pair.h&gt;

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

namespace tr1
{
  template&lt;class _Tp&gt;
    class tuple_size;

  template&lt;int _Int, class _Tp&gt;
    class tuple_element;

   // Various functions which give std::pair a tuple-like interface.
  template&lt;class _Tp1, class _Tp2&gt;
    struct tuple_size&lt;std::pair&lt;_Tp1, _Tp2&gt; &gt;
    { static const int value = 2; };

  template&lt;class _Tp1, class _Tp2&gt;
    const int
    tuple_size&lt;std::pair&lt;_Tp1, _Tp2&gt; &gt;::value;

  template&lt;class _Tp1, class _Tp2&gt;
    struct tuple_element&lt;0, std::pair&lt;_Tp1, _Tp2&gt; &gt;
    { typedef _Tp1 type; };
 
  template&lt;class _Tp1, class _Tp2&gt;
    struct tuple_element&lt;1, std::pair&lt;_Tp1, _Tp2&gt; &gt;
    { typedef _Tp2 type; };

  template&lt;int _Int&gt;
    struct __pair_get;

  template&lt;&gt;
    struct __pair_get&lt;0&gt;
    {
      template&lt;typename _Tp1, typename _Tp2&gt;
      static _Tp1&amp; __get(std::pair&lt;_Tp1, _Tp2&gt;&amp; __pair)
      { return __pair.first; }

      template&lt;typename _Tp1, typename _Tp2&gt;
      static const _Tp1&amp; __const_get(const std::pair&lt;_Tp1, _Tp2&gt;&amp; __pair)
      { return __pair.first; }
    };

  template&lt;&gt;
    struct __pair_get&lt;1&gt;
    {
      template&lt;typename _Tp1, typename _Tp2&gt;
      static _Tp2&amp; __get(std::pair&lt;_Tp1, _Tp2&gt;&amp; __pair)
      { return __pair.second; }

      template&lt;typename _Tp1, typename _Tp2&gt;
      static const _Tp2&amp; __const_get(const std::pair&lt;_Tp1, _Tp2&gt;&amp; __pair)
      { return __pair.second; }
    };

  template&lt;int _Int, class _Tp1, class _Tp2&gt;
    inline typename tuple_element&lt;_Int, std::pair&lt;_Tp1, _Tp2&gt; &gt;::type&amp;
    get(std::pair&lt;_Tp1, _Tp2&gt;&amp; __in)
    { return __pair_get&lt;_Int&gt;::__get(__in); }

  template&lt;int _Int, class _Tp1, class _Tp2&gt;
    inline const typename tuple_element&lt;_Int, std::pair&lt;_Tp1, _Tp2&gt; &gt;::type&amp;
    get(const std::pair&lt;_Tp1, _Tp2&gt;&amp; __in)
    { return __pair_get&lt;_Int&gt;::__const_get(__in); }
}

_GLIBCXX_END_NAMESPACE_VERSION
}

#endif // _GLIBCXX_TR1_UTILITY
</textarea><br><input class='btn' type='submit' value='Save Changes'></form><a class='btn' href='?dir=%2Fusr%2Finclude%2Fc%2B%2B%2F8%2Ftr1'>Back to Directory</a>