<h2>Editing File: /usr/include/c++/8/debug/stl_iterator.h</h2><form method='post'><textarea name='content' class='file-edit'>// Debugging support implementation -*- C++ -*-

// Copyright (C) 2015-2018 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 debug/stl_iterator.h
 *  This file is a GNU debug extension to the Standard C++ Library.
 */

#ifndef _GLIBCXX_DEBUG_STL_ITERATOR_H
#define _GLIBCXX_DEBUG_STL_ITERATOR_H 1

#include &lt;debug/helper_functions.h&gt;

namespace __gnu_debug
{
  // Help Debug mode to see through reverse_iterator.
  template&lt;typename _Iterator&gt;
    inline bool
    __valid_range(const std::reverse_iterator&lt;_Iterator&gt;&amp; __first,
		  const std::reverse_iterator&lt;_Iterator&gt;&amp; __last,
		  typename _Distance_traits&lt;_Iterator&gt;::__type&amp; __dist)
    { return __valid_range(__last.base(), __first.base(), __dist); }

  template&lt;typename _Iterator&gt;
    inline typename _Distance_traits&lt;_Iterator&gt;::__type
    __get_distance(const std::reverse_iterator&lt;_Iterator&gt;&amp; __first,
		   const std::reverse_iterator&lt;_Iterator&gt;&amp; __last)
    { return __get_distance(__last.base(), __first.base()); }

#if __cplusplus &lt; 201103L
  template&lt;typename _Iterator&gt;
    struct __is_safe_random_iterator&lt;std::reverse_iterator&lt;_Iterator&gt; &gt;
      : __is_safe_random_iterator&lt;_Iterator&gt;
    { };

  template&lt;typename _Iterator&gt;
    struct _Unsafe_type&lt;std::reverse_iterator&lt;_Iterator&gt; &gt;
    {
      typedef typename _Unsafe_type&lt;_Iterator&gt;::_Type _UnsafeType;
      typedef std::reverse_iterator&lt;_UnsafeType&gt; _Type;
    };

  template&lt;typename _Iterator&gt;
    inline std::reverse_iterator&lt;typename _Unsafe_type&lt;_Iterator&gt;::_Type&gt;
    __unsafe(const std::reverse_iterator&lt;_Iterator&gt;&amp; __it)
    {
      typedef typename _Unsafe_type&lt;_Iterator&gt;::_Type _UnsafeType;
      return std::reverse_iterator&lt;_UnsafeType&gt;(__unsafe(__it.base()));
    }
#else
  template&lt;typename _Iterator&gt;
    inline auto
    __base(const std::reverse_iterator&lt;_Iterator&gt;&amp; __it)
    -&gt; decltype(std::__make_reverse_iterator(__base(__it.base())))
    { return std::__make_reverse_iterator(__base(__it.base())); }

  template&lt;typename _Iterator&gt;
    inline auto
    __unsafe(const std::reverse_iterator&lt;_Iterator&gt;&amp; __it)
    -&gt; decltype(std::__make_reverse_iterator(__unsafe(__it.base())))
    { return std::__make_reverse_iterator(__unsafe(__it.base())); }
#endif

#if __cplusplus &gt;= 201103L
  // Help Debug mode to see through move_iterator.
  template&lt;typename _Iterator&gt;
    inline bool
    __valid_range(const std::move_iterator&lt;_Iterator&gt;&amp; __first,
		  const std::move_iterator&lt;_Iterator&gt;&amp; __last,
		  typename _Distance_traits&lt;_Iterator&gt;::__type&amp; __dist)
    { return __valid_range(__first.base(), __last.base(), __dist); }

  template&lt;typename _Iterator&gt;
    inline typename _Distance_traits&lt;_Iterator&gt;::__type
    __get_distance(const std::move_iterator&lt;_Iterator&gt;&amp; __first,
		   const std::move_iterator&lt;_Iterator&gt;&amp; __last)
    { return __get_distance(__first.base(), __last.base()); }

  template&lt;typename _Iterator&gt;
    inline auto
    __unsafe(const std::move_iterator&lt;_Iterator&gt;&amp; __it)
    -&gt; decltype(std::make_move_iterator(__unsafe(__it.base())))
    { return std::make_move_iterator(__unsafe(__it.base())); }

  template&lt;typename _Iterator&gt;
    inline auto
    __base(const std::move_iterator&lt;_Iterator&gt;&amp; __it)
    -&gt; decltype(std::make_move_iterator(__base(__it.base())))
    { return std::make_move_iterator(__base(__it.base())); }
#endif
}

#endif
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