contrib/llvm-project/libcxx/include/experimental/iterator

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