1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_EXPERIMENTAL_ITERATOR
11#define _LIBCPP_EXPERIMENTAL_ITERATOR
12
13/*
14namespace std {
15 namespace experimental {
16 inline namespace fundamentals_v2 {
17
18 template <class DelimT, class charT = char, class traits = char_traits<charT>>
19 class ostream_joiner {
20 public:
21 typedef charT char_type;
22 typedef traits traits_type;
23 typedef basic_ostream<charT, traits> ostream_type;
24 typedef output_iterator_tag iterator_category;
25 typedef void value_type;
26 typedef void difference_type;
27 typedef void pointer;
28 typedef void reference;
29
30 ostream_joiner(ostream_type& s, const DelimT& delimiter);
31 ostream_joiner(ostream_type& s, DelimT&& delimiter);
32
33 template<typename T>
34 ostream_joiner& operator=(const T& value);
35
36 ostream_joiner& operator*() noexcept;
37 ostream_joiner& operator++() noexcept;
38 ostream_joiner& operator++(int) noexcept;
39 private:
40 ostream_type* out_stream; // exposition only
41 DelimT delim; // exposition only
42 bool first_element; // exposition only
43 };
44
45 template <class charT, class traits, class DelimT>
46 ostream_joiner<decay_t<DelimT>, charT, traits>
47 make_ostream_joiner(basic_ostream<charT, traits>& os, DelimT&& delimiter);
48
49 } // inline namespace fundamentals_v2
50 } // namespace experimental
51} // namespace std
52
53*/
54
55#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
56# include <__cxx03/__config>
57#else
58# include <__config>
59# include <__memory/addressof.h>
60# include <__ostream/basic_ostream.h>
61# include <__string/char_traits.h>
62# include <__type_traits/decay.h>
63# include <__utility/forward.h>
64# include <__utility/move.h>
65# include <iterator>
66
67# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
68# pragma GCC system_header
69# endif
70
71_LIBCPP_PUSH_MACROS
72# include <__undef_macros>
73
74# if _LIBCPP_STD_VER >= 14
75
76_LIBCPP_BEGIN_NAMESPACE_LFTS
77
78template <class _Delim, class _CharT = char, class _Traits = char_traits<_CharT>>
79class ostream_joiner {
80public:
81 typedef _CharT char_type;
82 typedef _Traits traits_type;
83 typedef basic_ostream<char_type, traits_type> ostream_type;
84 typedef output_iterator_tag iterator_category;
85 typedef void value_type;
86 typedef void difference_type;
87 typedef void pointer;
88 typedef void reference;
89
90 _LIBCPP_HIDE_FROM_ABI ostream_joiner(ostream_type& __os, _Delim&& __d)
91 : __output_iter_(std::addressof(__os)), __delim_(std::move(__d)), __first_(true) {}
92
93 _LIBCPP_HIDE_FROM_ABI ostream_joiner(ostream_type& __os, const _Delim& __d)
94 : __output_iter_(std::addressof(__os)), __delim_(__d), __first_(true) {}
95
96 template <typename _Tp>
97 _LIBCPP_HIDE_FROM_ABI ostream_joiner& operator=(const _Tp& __v) {
98 if (!__first_)
99 *__output_iter_ << __delim_;
100 __first_ = false;
101 *__output_iter_ << __v;
102 return *this;
103 }
104
105 _LIBCPP_HIDE_FROM_ABI ostream_joiner& operator*() _NOEXCEPT { return *this; }
106 _LIBCPP_HIDE_FROM_ABI ostream_joiner& operator++() _NOEXCEPT { return *this; }
107 _LIBCPP_HIDE_FROM_ABI ostream_joiner& operator++(int) _NOEXCEPT { return *this; }
108
109private:
110 ostream_type* __output_iter_;
111 _Delim __delim_;
112 bool __first_;
113};
114
115template <class _CharT, class _Traits, class _Delim>
116_LIBCPP_HIDE_FROM_ABI ostream_joiner<__decay_t<_Delim>, _CharT, _Traits>
117make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os, _Delim&& __d) {
118 return ostream_joiner<__decay_t<_Delim>, _CharT, _Traits>(__os, std::forward<_Delim>(__d));
119}
120
121_LIBCPP_END_NAMESPACE_LFTS
122
123# endif // _LIBCPP_STD_VER >= 14
124
125_LIBCPP_POP_MACROS
126
127# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
128# include <cstddef>
129# include <iosfwd>
130# include <optional>
131# include <type_traits>
132# endif
133
134# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 23
135# include <locale>
136# endif
137
138#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
139
140#endif // _LIBCPP_EXPERIMENTAL_ITERATOR