<h2>Editing File: /usr/include/c++/8/experimental/iterator</h2><form method='post'><textarea name='content' class='file-edit'>// &lt;experimental/iterator&gt; -*- 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 experimental/iterator
 *  This is a TS C++ Library header.
 */

//
// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
//

#ifndef _GLIBCXX_EXPERIMENTAL_ITERATOR
#define _GLIBCXX_EXPERIMENTAL_ITERATOR 1

#pragma GCC system_header

#if __cplusplus &gt;= 201402L

#include &lt;iterator&gt;
#include &lt;iosfwd&gt;
#include &lt;experimental/type_traits&gt;

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

namespace experimental
{
inline namespace fundamentals_v2
{
#define __cpp_lib_experimental_ostream_joiner 201411

  /// Output iterator that inserts a delimiter between elements.
  template&lt;typename _DelimT, typename _CharT = char,
	   typename _Traits = char_traits&lt;_CharT&gt;&gt;
  class ostream_joiner
  {
  public:
    typedef _CharT				char_type;
    typedef _Traits				traits_type;
    typedef basic_ostream&lt;_CharT, _Traits&gt;	ostream_type;
    typedef output_iterator_tag			iterator_category;
    typedef void				value_type;
    typedef void				difference_type;
    typedef void				pointer;
    typedef void				reference;

    ostream_joiner(ostream_type&amp; __os, const _DelimT&amp; __delimiter)
    noexcept(is_nothrow_copy_constructible_v&lt;_DelimT&gt;)
    : _M_out(std::__addressof(__os)), _M_delim(__delimiter)
    { }

    ostream_joiner(ostream_type&amp; __os, _DelimT&amp;&amp; __delimiter)
    noexcept(is_nothrow_move_constructible_v&lt;_DelimT&gt;)
    : _M_out(std::__addressof(__os)), _M_delim(std::move(__delimiter))
    { }

    template&lt;typename _Tp&gt;
      ostream_joiner&amp;
      operator=(const _Tp&amp; __value)
      {
	if (!_M_first)
	  *_M_out &lt;&lt; _M_delim;
	_M_first = false;
	*_M_out &lt;&lt; __value;
	return *this;
      }

    ostream_joiner&amp; operator*() noexcept { return *this; }
    ostream_joiner&amp; operator++() noexcept { return *this; }
    ostream_joiner&amp; operator++(int) noexcept { return *this; }

  private:
    ostream_type* _M_out;
    _DelimT _M_delim;
    bool _M_first = true;
  };

  /// Object generator for ostream_joiner.
  template&lt;typename _CharT, typename _Traits, typename _DelimT&gt;
    inline ostream_joiner&lt;decay_t&lt;_DelimT&gt;, _CharT, _Traits&gt;
    make_ostream_joiner(basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
			_DelimT&amp;&amp; __delimiter)
    { return { __os, std::forward&lt;_DelimT&gt;(__delimiter) }; }
} // namespace fundamentals_v2
} // namespace experimental

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif // __cplusplus &lt;= 201103L

#endif // _GLIBCXX_EXPERIMENTAL_ITERATOR
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