libcxx/include/__iterator/ostreambuf_iterator.h

   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___ITERATOR_OSTREAMBUF_ITERATOR_H
  11 #define _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H
  12
  13 #include <__config>
  14 #include <__iterator/iterator.h>
  15 #include <__iterator/iterator_traits.h>
  16 #include <cstddef>
  17 #include <iosfwd> // for forward declaration of basic_streambuf
  18
  19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  20 #  pragma GCC system_header
  21 #endif
  22
  23 _LIBCPP_BEGIN_NAMESPACE_STD
  24
  25 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
  26 template <class _CharT, class _Traits>
  27 class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator
  28 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
  29     : public iterator<output_iterator_tag, void, void, void, void>
  30 #endif
  31 {
  32 _LIBCPP_SUPPRESS_DEPRECATED_POP
  33 public:
  34     typedef output_iterator_tag                 iterator_category;
  35     typedef void                                value_type;
  36 #if _LIBCPP_STD_VER >= 20
  37     typedef ptrdiff_t                           difference_type;
  38 #else
  39     typedef void                                difference_type;
  40 #endif
  41     typedef void                                pointer;
  42     typedef void                                reference;
  43     typedef _CharT                              char_type;
  44     typedef _Traits                             traits_type;
  45     typedef basic_streambuf<_CharT, _Traits>    streambuf_type;
  46     typedef basic_ostream<_CharT, _Traits>      ostream_type;
  47
  48 private:
  49     streambuf_type* __sbuf_;
  50 public:
  51     _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT
  52         : __sbuf_(__s.rdbuf()) {}
  53     _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT
  54         : __sbuf_(__s) {}
  55     _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c)
  56         {
  57             if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
  58                 __sbuf_ = nullptr;
  59             return *this;
  60         }
  61     _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*()     {return *this;}
  62     _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++()    {return *this;}
  63     _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;}
  64     _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == nullptr;}
  65
  66     template <class _Ch, class _Tr>
  67     friend
  68     _LIBCPP_HIDE_FROM_ABI
  69     ostreambuf_iterator<_Ch, _Tr>
  70     __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s,
  71                      const _Ch* __ob, const _Ch* __op, const _Ch* __oe,
  72                      ios_base& __iob, _Ch __fl);
  73 };
  74
  75 _LIBCPP_END_NAMESPACE_STD
  76
  77 #endif // _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H