1 // -*- C++ -*- 2 //===----------------------------- iterator -------------------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is distributed under the University of Illinois Open Source 7 // License. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 #ifndef _LIBCPP_EXPERIMENTAL_ITERATOR 12 #define _LIBCPP_EXPERIMENTAL_ITERATOR 13 14 /* 15 namespace std { 16 namespace experimental { 17 inline namespace fundamentals_v2 { 18 19 template <class DelimT, class charT = char, class traits = char_traits<charT>> 20 class ostream_joiner { 21 public: 22 typedef charT char_type; 23 typedef traits traits_type; 24 typedef basic_ostream<charT, traits> ostream_type; 25 typedef output_iterator_tag iterator_category; 26 typedef void value_type; 27 typedef void difference_type; 28 typedef void pointer; 29 typedef void reference; 30 31 ostream_joiner(ostream_type& s, const DelimT& delimiter); 32 ostream_joiner(ostream_type& s, DelimT&& delimiter); 33 34 template<typename T> 35 ostream_joiner& operator=(const T& value); 36 37 ostream_joiner& operator*() noexcept; 38 ostream_joiner& operator++() noexcept; 39 ostream_joiner& operator++(int) noexcept; 40 private: 41 ostream_type* out_stream; // exposition only 42 DelimT delim; // exposition only 43 bool first_element; // exposition only 44 }; 45 46 template <class charT, class traits, class DelimT> 47 ostream_joiner<decay_t<DelimT>, charT, traits> 48 make_ostream_joiner(basic_ostream<charT, traits>& os, DelimT&& delimiter); 49 50 } // inline namespace fundamentals_v2 51 } // namespace experimental 52 } // namespace std 53 54 */ 55 56 #include <experimental/__config> 57 58 #if _LIBCPP_STD_VER > 11 59 60 #include <iterator> 61 62 _LIBCPP_BEGIN_NAMESPACE_LFTS 63 64 template <class _Delim, class _CharT = char, class _Traits = char_traits<_CharT>> 65 class ostream_joiner { 66 public: 67 68 typedef _CharT char_type; 69 typedef _Traits traits_type; 70 typedef basic_ostream<char_type,traits_type> ostream_type; 71 typedef output_iterator_tag iterator_category; 72 typedef void value_type; 73 typedef void difference_type; 74 typedef void pointer; 75 typedef void reference; 76 77 ostream_joiner(ostream_type& __os, _Delim&& __d) 78 : __output_iter(_VSTD::addressof(__os)), __delim(_VSTD::move(__d)), __first(true) {} 79 80 ostream_joiner(ostream_type& __os, const _Delim& __d) 81 : __output_iter(_VSTD::addressof(__os)), __delim(__d), __first(true) {} 82 83 84 template<typename _Tp> 85 ostream_joiner& operator=(const _Tp& __v) 86 { 87 if (!__first) 88 *__output_iter << __delim; 89 __first = false; 90 *__output_iter << __v; 91 return *this; 92 } 93 94 ostream_joiner& operator*() _NOEXCEPT { return *this; } 95 ostream_joiner& operator++() _NOEXCEPT { return *this; } 96 ostream_joiner& operator++(int) _NOEXCEPT { return *this; } 97 98 private: 99 ostream_type* __output_iter; 100 _Delim __delim; 101 bool __first; 102 }; 103 104 105 template <class _CharT, class _Traits, class _Delim> 106 ostream_joiner<typename decay<_Delim>::type, _CharT, _Traits> 107 make_ostream_joiner(basic_ostream<_CharT, _Traits>& __os, _Delim && __d) 108 { return ostream_joiner<typename decay<_Delim>::type, _CharT, _Traits>(__os, _VSTD::forward<_Delim>(__d)); } 109 110 _LIBCPP_END_NAMESPACE_LFTS 111 112 #endif /* _LIBCPP_STD_VER > 11 */ 113 114 #endif // _LIBCPP_EXPERIMENTAL_ITERATOR 115
