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
  34 public:
  35   typedef output_iterator_tag iterator_category;
  36   typedef void value_type;
  37 #if _LIBCPP_STD_VER >= 20
  38   typedef ptrdiff_t difference_type;
  39 #else
  40   typedef void difference_type;
  41 #endif
  42   typedef void pointer;
  43   typedef void reference;
  44   typedef _CharT char_type;
  45   typedef _Traits traits_type;
  46   typedef basic_streambuf<_CharT, _Traits> streambuf_type;
  47   typedef basic_ostream<_CharT, _Traits> ostream_type;
  48
  49 private:
  50   streambuf_type* __sbuf_;
  51
  52 public:
  53   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator(ostream_type& __s) _NOEXCEPT : __sbuf_(__s.rdbuf()) {}
  54   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT : __sbuf_(__s) {}
  55   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator=(_CharT __c) {
  56     if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
  57       __sbuf_ = nullptr;
  58     return *this;
  59   }
  60   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator*() { return *this; }
  61   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator++() { return *this; }
  62   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator++(int) { return *this; }
  63   _LIBCPP_HIDE_FROM_ABI bool failed() const _NOEXCEPT { return __sbuf_ == nullptr; }
  64
  65   template <class _Ch, class _Tr>
  66   friend _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator<_Ch, _Tr> __pad_and_output(
  67       ostreambuf_iterator<_Ch, _Tr> __s, const _Ch* __ob, const _Ch* __op, const _Ch* __oe, ios_base& __iob, _Ch __fl);
  68 };
  69
  70 _LIBCPP_END_NAMESPACE_STD
  71
  72 #endif // _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H