include/__iterator/ostreambuf_iterator.h

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H
#define _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H

#include <__config>
#include <__iterator/iterator.h>
#include <__iterator/iterator_traits.h>
#include <iosfwd> // for forward declaration of basic_streambuf

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator
#if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
    : public iterator<output_iterator_tag, void, void, void, void>
#endif
{
_LIBCPP_SUPPRESS_DEPRECATED_POP
public:
    typedef output_iterator_tag                 iterator_category;
    typedef void                                value_type;
#if _LIBCPP_STD_VER > 17
    typedef ptrdiff_t                           difference_type;
#else
    typedef void                                difference_type;
#endif
    typedef void                                pointer;
    typedef void                                reference;
    typedef _CharT                              char_type;
    typedef _Traits                             traits_type;
    typedef basic_streambuf<_CharT, _Traits>    streambuf_type;
    typedef basic_ostream<_CharT, _Traits>      ostream_type;

private:
    streambuf_type* __sbuf_;
public:
    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(ostream_type& __s) _NOEXCEPT
        : __sbuf_(__s.rdbuf()) {}
    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator(streambuf_type* __s) _NOEXCEPT
        : __sbuf_(__s) {}
    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator=(_CharT __c)
        {
            if (__sbuf_ && traits_type::eq_int_type(__sbuf_->sputc(__c), traits_type::eof()))
                __sbuf_ = nullptr;
            return *this;
        }
    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator*()     {return *this;}
    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++()    {return *this;}
    _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;}
    _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == nullptr;}

    template <class _Ch, class _Tr>
    friend
    _LIBCPP_HIDDEN
    ostreambuf_iterator<_Ch, _Tr>
    __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s,
                     const _Ch* __ob, const _Ch* __op, const _Ch* __oe,
                     ios_base& __iob, _Ch __fl);
};

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ITERATOR_OSTREAMBUF_ITERATOR_H