libstdc++
experimental/iterator
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1 // <experimental/iterator> -*- C++ -*-
2 
3 // Copyright (C) 2015-2017 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  */
28 
29 //
30 // N4336 Working Draft, C++ Extensions for Library Fundamentals, Version 2
31 //
32 
33 #ifndef _GLIBCXX_EXPERIMENTAL_ITERATOR
34 #define _GLIBCXX_EXPERIMENTAL_ITERATOR 1
35 
36 #pragma GCC system_header
37 
38 #if __cplusplus <= 201103L
39 # include <bits/c++14_warning.h>
40 #else
41 
42 #include <iterator>
43 #include <iosfwd>
44 #include <experimental/type_traits>
45 
46 namespace std _GLIBCXX_VISIBILITY(default)
47 {
48 namespace experimental
49 {
50 inline namespace fundamentals_v2
51 {
52 _GLIBCXX_BEGIN_NAMESPACE_VERSION
53 
54 #define __cpp_lib_experimental_ostream_joiner 201411
55 
56  /// Output iterator that inserts a delimiter between elements.
57  template<typename _DelimT, typename _CharT = char,
58  typename _Traits = char_traits<_CharT>>
60  {
61  public:
62  typedef _CharT char_type;
63  typedef _Traits traits_type;
66  typedef void value_type;
67  typedef void difference_type;
68  typedef void pointer;
69  typedef void reference;
70 
71  ostream_joiner(ostream_type& __os, const _DelimT& __delimiter)
72  noexcept(is_nothrow_copy_constructible_v<_DelimT>)
73  : _M_out(std::__addressof(__os)), _M_delim(__delimiter)
74  { }
75 
76  ostream_joiner(ostream_type& __os, _DelimT&& __delimiter)
77  noexcept(is_nothrow_move_constructible_v<_DelimT>)
78  : _M_out(std::__addressof(__os)), _M_delim(std::move(__delimiter))
79  { }
80 
81  template<typename _Tp>
83  operator=(const _Tp& __value)
84  {
85  if (!_M_first)
86  *_M_out << _M_delim;
87  _M_first = false;
88  *_M_out << __value;
89  return *this;
90  }
91 
92  ostream_joiner& operator*() noexcept { return *this; }
93  ostream_joiner& operator++() noexcept { return *this; }
94  ostream_joiner& operator++(int) noexcept { return *this; }
95 
96  private:
97  ostream_type* _M_out;
98  _DelimT _M_delim;
99  bool _M_first = true;
100  };
101 
102  /// Object generator for ostream_joiner.
103  template<typename _CharT, typename _Traits, typename _DelimT>
104  inline ostream_joiner<decay_t<_DelimT>, _CharT, _Traits>
106  _DelimT&& __delimiter)
107  { return { __os, std::forward<_DelimT>(__delimiter) }; }
108 
109 _GLIBCXX_END_NAMESPACE_VERSION
110 } // namespace fundamentals_v2
111 } // namespace experimental
112 } // namespace std
113 
114 #endif // __cplusplus <= 201103L
115 
116 #endif // _GLIBCXX_EXPERIMENTAL_ITERATOR
constexpr _Tp * __addressof(_Tp &__r) noexcept
Same as C++11 std::addressof.
Definition: move.h:47
ISO C++ entities toplevel namespace is std.
Template class basic_ostream.
Definition: iosfwd:86
Output iterator that inserts a delimiter between elements.
Marking output iterators.
ostream_joiner< decay_t< _DelimT >, _CharT, _Traits > make_ostream_joiner(basic_ostream< _CharT, _Traits > &__os, _DelimT &&__delimiter)
Object generator for ostream_joiner.