include/iosfwd

// -*- 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_IOSFWD
#define _LIBCPP_IOSFWD

/*
    iosfwd synopsis

namespace std
{

template<class charT> struct char_traits;
template<>            struct char_traits<char>;
template<>            struct char_traits<char8_t>;  // C++20
template<>            struct char_traits<char16_t>;
template<>            struct char_traits<char32_t>;
template<>            struct char_traits<wchar_t>;

template<class T>     class allocator;

class ios_base;
template <class charT, class traits = char_traits<charT> > class basic_ios;

template <class charT, class traits = char_traits<charT> > class basic_streambuf;
template <class charT, class traits = char_traits<charT> > class basic_istream;
template <class charT, class traits = char_traits<charT> > class basic_ostream;
template <class charT, class traits = char_traits<charT> > class basic_iostream;

template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
    class basic_stringbuf;
template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
    class basic_istringstream;
template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
    class basic_ostringstream;
template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
    class basic_stringstream;

template <class charT, class traits = char_traits<charT> > class basic_filebuf;
template <class charT, class traits = char_traits<charT> > class basic_ifstream;
template <class charT, class traits = char_traits<charT> > class basic_ofstream;
template <class charT, class traits = char_traits<charT> > class basic_fstream;

template <class charT, class traits = char_traits<charT> > class istreambuf_iterator;
template <class charT, class traits = char_traits<charT> > class ostreambuf_iterator;

typedef basic_ios<char>              ios;
typedef basic_ios<wchar_t>           wios;

typedef basic_streambuf<char>        streambuf;
typedef basic_istream<char>          istream;
typedef basic_ostream<char>          ostream;
typedef basic_iostream<char>         iostream;

typedef basic_stringbuf<char>        stringbuf;
typedef basic_istringstream<char>    istringstream;
typedef basic_ostringstream<char>    ostringstream;
typedef basic_stringstream<char>     stringstream;

typedef basic_filebuf<char>          filebuf;
typedef basic_ifstream<char>         ifstream;
typedef basic_ofstream<char>         ofstream;
typedef basic_fstream<char>          fstream;

typedef basic_streambuf<wchar_t>     wstreambuf;
typedef basic_istream<wchar_t>       wistream;
typedef basic_ostream<wchar_t>       wostream;
typedef basic_iostream<wchar_t>      wiostream;

typedef basic_stringbuf<wchar_t>     wstringbuf;
typedef basic_istringstream<wchar_t> wistringstream;
typedef basic_ostringstream<wchar_t> wostringstream;
typedef basic_stringstream<wchar_t>  wstringstream;

typedef basic_filebuf<wchar_t>       wfilebuf;
typedef basic_ifstream<wchar_t>      wifstream;
typedef basic_ofstream<wchar_t>      wofstream;
typedef basic_fstream<wchar_t>       wfstream;

template <class state> class fpos;
using streampos  = fpos<char_traits<char>::state_type>;
using wstreampos = fpos<char_traits<wchar_t>::state_type>;
using u8streampos = fpos<char_traits<char8_t>::state_type>; // C++20
using u16streampos = fpos<char_traits<char16_t>::state_type>;
using u32streampos = fpos<char_traits<char32_t>::state_type>;

}  // std

*/

#include <__config>
#include <__mbstate_t.h>
#include <version>

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

_LIBCPP_BEGIN_NAMESPACE_STD

class _LIBCPP_TYPE_VIS ios_base;

template<class _CharT>  struct _LIBCPP_TEMPLATE_VIS char_traits;
template<> struct char_traits<char>;
#ifndef _LIBCPP_HAS_NO_CHAR8_T
template<> struct char_traits<char8_t>;
#endif
template<> struct char_traits<char16_t>;
template<> struct char_traits<char32_t>;
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
template<> struct char_traits<wchar_t>;
#endif

template<class _Tp>     class _LIBCPP_TEMPLATE_VIS allocator;

template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_ios;

template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_streambuf;
template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_istream;
template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_ostream;
template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_iostream;

template <class _CharT, class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_stringbuf;
template <class _CharT, class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_istringstream;
template <class _CharT, class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_ostringstream;
template <class _CharT, class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_stringstream;

template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_filebuf;
template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_ifstream;
template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_ofstream;
template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_fstream;

template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS istreambuf_iterator;
template <class _CharT, class _Traits = char_traits<_CharT> >
    class _LIBCPP_TEMPLATE_VIS ostreambuf_iterator;

typedef basic_ios<char>              ios;
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
typedef basic_ios<wchar_t>           wios;
#endif

typedef basic_streambuf<char>        streambuf;
typedef basic_istream<char>          istream;
typedef basic_ostream<char>          ostream;
typedef basic_iostream<char>         iostream;

typedef basic_stringbuf<char>        stringbuf;
typedef basic_istringstream<char>    istringstream;
typedef basic_ostringstream<char>    ostringstream;
typedef basic_stringstream<char>     stringstream;

typedef basic_filebuf<char>          filebuf;
typedef basic_ifstream<char>         ifstream;
typedef basic_ofstream<char>         ofstream;
typedef basic_fstream<char>          fstream;

#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
typedef basic_streambuf<wchar_t>     wstreambuf;
typedef basic_istream<wchar_t>       wistream;
typedef basic_ostream<wchar_t>       wostream;
typedef basic_iostream<wchar_t>      wiostream;

typedef basic_stringbuf<wchar_t>     wstringbuf;
typedef basic_istringstream<wchar_t> wistringstream;
typedef basic_ostringstream<wchar_t> wostringstream;
typedef basic_stringstream<wchar_t>  wstringstream;

typedef basic_filebuf<wchar_t>       wfilebuf;
typedef basic_ifstream<wchar_t>      wifstream;
typedef basic_ofstream<wchar_t>      wofstream;
typedef basic_fstream<wchar_t>       wfstream;
#endif

template <class _CharT, class _Traits>
    class _LIBCPP_PREFERRED_NAME(ios) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wios)) basic_ios;

template <class _CharT, class _Traits>
    class _LIBCPP_PREFERRED_NAME(streambuf) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wstreambuf)) basic_streambuf;
template <class _CharT, class _Traits>
    class _LIBCPP_PREFERRED_NAME(istream) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wistream)) basic_istream;
template <class _CharT, class _Traits>
    class _LIBCPP_PREFERRED_NAME(ostream) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wostream)) basic_ostream;
template <class _CharT, class _Traits>
    class _LIBCPP_PREFERRED_NAME(iostream) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wiostream)) basic_iostream;

template <class _CharT, class _Traits, class _Allocator>
    class _LIBCPP_PREFERRED_NAME(stringbuf) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wstringbuf)) basic_stringbuf;
template <class _CharT, class _Traits, class _Allocator>
    class _LIBCPP_PREFERRED_NAME(istringstream) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wistringstream)) basic_istringstream;
template <class _CharT, class _Traits, class _Allocator>
    class _LIBCPP_PREFERRED_NAME(ostringstream) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wostringstream)) basic_ostringstream;
template <class _CharT, class _Traits, class _Allocator>
    class _LIBCPP_PREFERRED_NAME(stringstream) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wstringstream)) basic_stringstream;

template <class _CharT, class _Traits>
    class _LIBCPP_PREFERRED_NAME(filebuf) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wfilebuf)) basic_filebuf;
template <class _CharT, class _Traits>
    class _LIBCPP_PREFERRED_NAME(ifstream) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wifstream)) basic_ifstream;
template <class _CharT, class _Traits>
    class _LIBCPP_PREFERRED_NAME(ofstream) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wofstream)) basic_ofstream;
template <class _CharT, class _Traits>
    class _LIBCPP_PREFERRED_NAME(fstream) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wfstream)) basic_fstream;

template <class _State>             class _LIBCPP_TEMPLATE_VIS fpos;
typedef fpos<mbstate_t>    streampos;
typedef fpos<mbstate_t>    wstreampos;
#ifndef _LIBCPP_HAS_NO_CHAR8_T
typedef fpos<mbstate_t>    u8streampos;
#endif
#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
typedef fpos<mbstate_t>    u16streampos;
typedef fpos<mbstate_t>    u32streampos;
#endif

#if defined(_NEWLIB_VERSION)
// On newlib, off_t is 'long int'
typedef long int streamoff;         // for char_traits in <string>
#else
typedef long long streamoff;        // for char_traits in <string>
#endif

template <class _CharT,             // for <stdexcept>
          class _Traits = char_traits<_CharT>,
          class _Allocator = allocator<_CharT> >
    class _LIBCPP_TEMPLATE_VIS basic_string;
typedef basic_string<char, char_traits<char>, allocator<char> > string;
#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
typedef basic_string<wchar_t, char_traits<wchar_t>, allocator<wchar_t> > wstring;
#endif

template <class _CharT, class _Traits, class _Allocator>
    class _LIBCPP_PREFERRED_NAME(string) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wstring)) basic_string;

// Include other forward declarations here
template <class _Tp, class _Alloc = allocator<_Tp> >
class _LIBCPP_TEMPLATE_VIS vector;

template <class _CharT, class _Traits>
class __save_flags
{
    typedef basic_ios<_CharT, _Traits> __stream_type;
    typedef typename __stream_type::fmtflags fmtflags;

    __stream_type& __stream_;
    fmtflags       __fmtflags_;
    _CharT         __fill_;

    __save_flags(const __save_flags&);
    __save_flags& operator=(const __save_flags&);
public:
    _LIBCPP_INLINE_VISIBILITY
    explicit __save_flags(__stream_type& __stream)
        : __stream_(__stream),
          __fmtflags_(__stream.flags()),
          __fill_(__stream.fill())
        {}
    _LIBCPP_INLINE_VISIBILITY
    ~__save_flags()
    {
        __stream_.flags(__fmtflags_);
        __stream_.fill(__fill_);
    }
};

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_IOSFWD