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      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
    114