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The C and C++ Include Header Files

/usr/include/c++/11/experimental/iterator


$ cat -n /usr/include/c++/11/experimental/iterator

     1	// <experimental/iterator> -*- C++ -*-
     2	
     3	// Copyright (C) 2015-2021 Free Software Foundation, Inc.
     4	//
     5	// This file is part of the GNU ISO C++ Library.  This library is free
     6	// software; you can redistribute it and/or modify it under the
     7	// terms of the GNU General Public License as published by the
     8	// Free Software Foundation; either version 3, or (at your option)
     9	// any later version.
    10	
    11	// This library is distributed in the hope that it will be useful,
    12	// but WITHOUT ANY WARRANTY; without even the implied warranty of
    13	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    14	// GNU General Public License for more details.
    15	
    16	// Under Section 7 of GPL version 3, you are granted additional
    17	// permissions described in the GCC Runtime Library Exception, version
    18	// 3.1, as published by the Free Software Foundation.
    19	
    20	// You should have received a copy of the GNU General Public License and
    21	// a copy of the GCC Runtime Library Exception along with this program;
    22	// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    23	// <http://www.gnu.org/licenses/>.
    24	
    25	/** @file experimental/iterator
    26	 *  This is a TS C++ Library header.
    27	 *  @ingroup libfund-ts
    28	 */
    29	
    30	//
    31	// N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
    32	//
    33	
    34	#ifndef _GLIBCXX_EXPERIMENTAL_ITERATOR
    35	#define _GLIBCXX_EXPERIMENTAL_ITERATOR 1
    36	
    37	#pragma GCC system_header
    38	
    39	#if __cplusplus >= 201402L
    40	
    41	#include <iterator>
    42	#include <iosfwd>
    43	#include <experimental/type_traits>
    44	
    45	namespace std _GLIBCXX_VISIBILITY(default)
    46	{
    47	_GLIBCXX_BEGIN_NAMESPACE_VERSION
    48	
    49	namespace experimental
    50	{
    51	inline namespace fundamentals_v2
    52	{
    53	#define __cpp_lib_experimental_ostream_joiner 201411
    54	
    55	  /// Output iterator that inserts a delimiter between elements.
    56	  template<typename _DelimT, typename _CharT = char,
    57		   typename _Traits = char_traits<_CharT>>
    58	  class ostream_joiner
    59	  {
    60	  public:
    61	    typedef _CharT				char_type;
    62	    typedef _Traits				traits_type;
    63	    typedef basic_ostream<_CharT, _Traits>	ostream_type;
    64	    typedef output_iterator_tag			iterator_category;
    65	    typedef void				value_type;
    66	    typedef void				difference_type;
    67	    typedef void				pointer;
    68	    typedef void				reference;
    69	
    70	    ostream_joiner(ostream_type& __os, const _DelimT& __delimiter)
    71	    noexcept(is_nothrow_copy_constructible_v<_DelimT>)
    72	    : _M_out(std::__addressof(__os)), _M_delim(__delimiter)
    73	    { }
    74	
    75	    ostream_joiner(ostream_type& __os, _DelimT&& __delimiter)
    76	    noexcept(is_nothrow_move_constructible_v<_DelimT>)
    77	    : _M_out(std::__addressof(__os)), _M_delim(std::move(__delimiter))
    78	    { }
    79	
    80	    template<typename _Tp>
    81	      ostream_joiner&
    82	      operator=(const _Tp& __value)
    83	      {
    84		if (!_M_first)
    85		  *_M_out << _M_delim;
    86		_M_first = false;
    87		*_M_out << __value;
    88		return *this;
    89	      }
    90	
    91	    ostream_joiner& operator*() noexcept { return *this; }
    92	    ostream_joiner& operator++() noexcept { return *this; }
    93	    ostream_joiner& operator++(int) noexcept { return *this; }
    94	
    95	  private:
    96	    ostream_type* _M_out;
    97	    _DelimT _M_delim;
    98	    bool _M_first = true;
    99	  };
   100	
   101	  /// Object generator for ostream_joiner.
   102	  template<typename _CharT, typename _Traits, typename _DelimT>
   103	    inline ostream_joiner<decay_t<_DelimT>, _CharT, _Traits>
   104	    make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os,
   105				_DelimT&& __delimiter)
   106	    { return { __os, std::forward<_DelimT>(__delimiter) }; }
   107	} // namespace fundamentals_v2
   108	} // namespace experimental
   109	
   110	_GLIBCXX_END_NAMESPACE_VERSION
   111	} // namespace std
   112	
   113	#endif // __cplusplus <= 201103L
   114	
   115	#endif // _GLIBCXX_EXPERIMENTAL_ITERATOR