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#include <__assert> // all public C++ headers provide the assertion handler 56#include <__memory/addressof.h> 57#include <__utility/forward.h> 58#include <__utility/move.h> 59#include <experimental/__config> 60#include <iosfwd> // char_traits 61#include <iterator> 62 63#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 64# pragma GCC system_header 65#endif 66 67#if _LIBCPP_STD_VER > 11 68 69_LIBCPP_BEGIN_NAMESPACE_LFTS 70 71template <class _Delim, class _CharT = char, class _Traits = char_traits<_CharT>> 72class ostream_joiner { 73public: 74 75 typedef _CharT char_type; 76 typedef _Traits traits_type; 77 typedef basic_ostream<char_type,traits_type> ostream_type; 78 typedef output_iterator_tag iterator_category; 79 typedef void value_type; 80 typedef void difference_type; 81 typedef void pointer; 82 typedef void reference; 83 84 ostream_joiner(ostream_type& __os, _Delim&& __d) 85 : __output_iter(_VSTD::addressof(__os)), __delim(_VSTD::move(__d)), __first(true) {} 86 87 ostream_joiner(ostream_type& __os, const _Delim& __d) 88 : __output_iter(_VSTD::addressof(__os)), __delim(__d), __first(true) {} 89 90 91 template<typename _Tp> 92 ostream_joiner& operator=(const _Tp& __v) 93 { 94 if (!__first) 95 *__output_iter << __delim; 96 __first = false; 97 *__output_iter << __v; 98 return *this; 99 } 100 101 ostream_joiner& operator*() _NOEXCEPT { return *this; } 102 ostream_joiner& operator++() _NOEXCEPT { return *this; } 103 ostream_joiner& operator++(int) _NOEXCEPT { return *this; } 104 105private: 106 ostream_type* __output_iter; 107 _Delim __delim; 108 bool __first; 109}; 110 111 112template <class _CharT, class _Traits, class _Delim> 113ostream_joiner<typename decay<_Delim>::type, _CharT, _Traits> 114make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os, _Delim && __d) 115{ return ostream_joiner<typename decay<_Delim>::type, _CharT, _Traits>(__os, _VSTD::forward<_Delim>(__d)); } 116 117_LIBCPP_END_NAMESPACE_LFTS 118 119#endif // _LIBCPP_STD_VER > 11 120 121#endif // _LIBCPP_EXPERIMENTAL_ITERATOR 122