v1/__iterator/ostreambuf_iterator.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H
0011 #define _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H
0012
0013 #include <__config>
0014 #include <__cstddef/ptrdiff_t.h>
0015 #include <__fwd/ios.h>
0016 #include <__fwd/ostream.h>
0017 #include <__fwd/streambuf.h>
0018 #include <__iterator/iterator.h>
0019 #include <__iterator/iterator_traits.h>
0020 #include <iosfwd> // for forward declaration of ostreambuf_iterator
0021
0022 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0023 #  pragma GCC system_header
0024 #endif
0025
0026 _LIBCPP_BEGIN_NAMESPACE_STD
0027
0028 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
0029 template <class _CharT, class _Traits>
0030 class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator
0031 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
0032     : public iterator<output_iterator_tag, void, void, void, void>
0033 #endif
0034 {
0035   _LIBCPP_SUPPRESS_DEPRECATED_POP
0036
0037 public:
0038   typedef output_iterator_tag iterator_category;
0039   typedef void value_type;
0040 #if _LIBCPP_STD_VER >= 20
0041   typedef ptrdiff_t difference_type;
0042 #else
0043   typedef void difference_type;
0044 #endif
0045   typedef void pointer;
0046   typedef void reference;
0047   typedef _CharT char_type;
0048   typedef _Traits traits_type;
0049   typedef basic_streambuf<_CharT, _Traits> streambuf_type;
0050   typedef basic_ostream<_CharT, _Traits> ostream_type;
0051
0052 private:
0053   streambuf_type* __sbuf_;
0054
0055 public:
0056   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator(ostream_type& __s) _NOEXCEPT : __sbuf_(__s.rdbuf()) {}
0057   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT : __sbuf_(__s) {}
0058   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator=(_CharT __c) {
0059     if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
0060       __sbuf_ = nullptr;
0061     return *this;
0062   }
0063   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator*() { return *this; }
0064   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator++() { return *this; }
0065   _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator& operator++(int) { return *this; }
0066   _LIBCPP_HIDE_FROM_ABI bool failed() const _NOEXCEPT { return __sbuf_ == nullptr; }
0067
0068 #if _LIBCPP_HAS_LOCALIZATION
0069   template <class _Ch, class _Tr>
0070   friend _LIBCPP_HIDE_FROM_ABI ostreambuf_iterator<_Ch, _Tr> __pad_and_output(
0071       ostreambuf_iterator<_Ch, _Tr> __s, const _Ch* __ob, const _Ch* __op, const _Ch* __oe, ios_base& __iob, _Ch __fl);
0072 #endif // _LIBCPP_HAS_LOCALIZATION
0073 };
0074
0075 _LIBCPP_END_NAMESPACE_STD
0076
0077 #endif // _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H