1 // <experimental/iterator> -*- C++ -*-
3 // Copyright (C) 2015-2025 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25 /** @file experimental/iterator
26 * This is a TS C++ Library header.
31 // N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
34 #ifndef _GLIBCXX_EXPERIMENTAL_ITERATOR
35 #define _GLIBCXX_EXPERIMENTAL_ITERATOR 1
37 #ifdef _GLIBCXX_SYSHDR
38 #pragma GCC system_header
41 #include <bits/requires_hosted.h> // experimental is currently omitted
43 #if __cplusplus >= 201402L
47 #include <experimental/type_traits>
49 namespace std _GLIBCXX_VISIBILITY(default)
51 _GLIBCXX_BEGIN_NAMESPACE_VERSION
53 namespace experimental
55 inline namespace fundamentals_v2
57 #define __cpp_lib_experimental_ostream_joiner 201411
59 /// Output iterator that inserts a delimiter between elements.
60 template<typename _DelimT, typename _CharT = char,
61 typename _Traits = char_traits<_CharT>>
65 typedef _CharT char_type;
66 typedef _Traits traits_type;
67 typedef basic_ostream<_CharT, _Traits> ostream_type;
68 typedef output_iterator_tag iterator_category;
69 typedef void value_type;
70 typedef void difference_type;
72 typedef void reference;
74 ostream_joiner(ostream_type& __os, const _DelimT& __delimiter)
75 noexcept(is_nothrow_copy_constructible_v<_DelimT>)
76 : _M_out(std::__addressof(__os)), _M_delim(__delimiter)
79 ostream_joiner(ostream_type& __os, _DelimT&& __delimiter)
80 noexcept(is_nothrow_move_constructible_v<_DelimT>)
81 : _M_out(std::__addressof(__os)), _M_delim(std::move(__delimiter))
84 template<typename _Tp>
86 operator=(const _Tp& __value)
95 ostream_joiner& operator*() noexcept { return *this; }
96 ostream_joiner& operator++() noexcept { return *this; }
97 ostream_joiner& operator++(int) noexcept { return *this; }
100 ostream_type* _M_out;
102 bool _M_first = true;
105 /// Object generator for ostream_joiner.
106 template<typename _CharT, typename _Traits, typename _DelimT>
107 inline ostream_joiner<decay_t<_DelimT>, _CharT, _Traits>
108 make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os,
109 _DelimT&& __delimiter)
110 { return { __os, std::forward<_DelimT>(__delimiter) }; }
111 } // namespace fundamentals_v2
112 } // namespace experimental
114 _GLIBCXX_END_NAMESPACE_VERSION
117 #endif // __cplusplus <= 201103L
119 #endif // _GLIBCXX_EXPERIMENTAL_ITERATOR