contrib/libc++/include/experimental/iterator

   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