// iosfwd standard header

// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#pragma once
#ifndef _IOSFWD_
#define _IOSFWD_
#include <yvals.h>
#if _STL_COMPILER_PREPROCESSOR

#include <cstdio>
#include <cstring>
#include <cwchar>
#include <xstddef>

#pragma pack(push, _CRT_PACKING)
#pragma warning(push, _STL_WARNING_LEVEL)
#pragma warning(disable : _STL_DISABLED_WARNINGS)
_STL_DISABLE_CLANG_WARNINGS
#pragma push_macro("new")
#undef new

_STD_BEGIN
// I/O EXCEPTION MACROS

#if _HAS_EXCEPTIONS
#define _TRY_IO_BEGIN _TRY_BEGIN // begin try block

#define _CATCH_IO_END                                                          \
    _CATCH_ALL /* catch block for _Myios */                                    \
        _Myios::setstate(ios_base::badbit, true); /* set badbit and rethrow */ \
    _CATCH_END

#define _CATCH_IO_(xtype, x)                                             \
    _CATCH_ALL /* catch block for basic_ios x */                         \
        (x)                                                              \
            .setstate(xtype::badbit, true); /* set badbit and rethrow */ \
    _CATCH_END

#else // _HAS_EXCEPTIONS
#define _TRY_IO_BEGIN        { // begin try block
#define _CATCH_IO_END        } // catch block for _Myios
#define _CATCH_IO_(xtype, x) } // catch block for basic_ios x
#endif // _HAS_EXCEPTIONS

// STREAM POSITIONING TYPES (from <streambuf>)
using streamoff  = long long;
using streamsize = long long;

// CLASS TEMPLATE fpos (from <streambuf>)
template <class _Statetype>
class fpos { // store arbitrary file position
public:
    /* implicit */ fpos(streamoff _Off = 0) : _Myoff(_Off), _Fpos(0), _Mystate() {}

    fpos(_Statetype _State, fpos_t _Fileposition) : _Myoff(_Fileposition), _Fpos(0), _Mystate(_State) {}

    _NODISCARD _Statetype state() const {
        return _Mystate;
    }

    void state(_Statetype _State) {
        _Mystate = _State;
    }

    operator streamoff() const {
        // TRANSITION, ABI: We currently always set _Fpos to 0 but older .objs containing old
        // basic_filebuf would set _Fpos.
        return _Myoff + _Fpos;
    }

#ifndef _REMOVE_FPOS_SEEKPOS
    _DEPRECATE_FPOS_SEEKPOS fpos_t seekpos() const noexcept {
        return {};
    }
#endif // _REMOVE_FPOS_SEEKPOS

    _NODISCARD streamoff operator-(const fpos& _Right) const {
        return static_cast<streamoff>(*this) - static_cast<streamoff>(_Right);
    }

    fpos& operator+=(streamoff _Off) { // add offset
        _Myoff += _Off;
        return *this;
    }

    fpos& operator-=(streamoff _Off) { // subtract offset
        _Myoff -= _Off;
        return *this;
    }

    _NODISCARD fpos operator+(streamoff _Off) const {
        fpos _Tmp = *this;
        _Tmp += _Off;
        return _Tmp;
    }

    _NODISCARD fpos operator-(streamoff _Off) const {
        fpos _Tmp = *this;
        _Tmp -= _Off;
        return _Tmp;
    }

    _NODISCARD bool operator==(const fpos& _Right) const {
        return static_cast<streamoff>(*this) == static_cast<streamoff>(_Right);
    }

    template <class _Int, enable_if_t<is_integral_v<_Int>, int> = 0>
    _NODISCARD friend bool operator==(const fpos& _Left, const _Int _Right) {
        return static_cast<streamoff>(_Left) == _Right;
    }

    template <class _Int, enable_if_t<is_integral_v<_Int>, int> = 0>
    _NODISCARD friend bool operator==(const _Int _Left, const fpos& _Right) {
        return _Left == static_cast<streamoff>(_Right);
    }

    _NODISCARD bool operator!=(const fpos& _Right) const {
        return static_cast<streamoff>(*this) != static_cast<streamoff>(_Right);
    }

    template <class _Int, enable_if_t<is_integral_v<_Int>, int> = 0>
    _NODISCARD friend bool operator!=(const fpos& _Left, const _Int _Right) {
        return static_cast<streamoff>(_Left) != _Right;
    }

    template <class _Int, enable_if_t<is_integral_v<_Int>, int> = 0>
    _NODISCARD friend bool operator!=(const _Int _Left, const fpos& _Right) {
        return _Left != static_cast<streamoff>(_Right);
    }

private:
    streamoff _Myoff; // stream offset
    fpos_t _Fpos; // TRANSITION, ABI. C file position, not currently used
    _Statetype _Mystate; // current conversion state
};

using streampos  = fpos<_Mbstatet>;
using wstreampos = streampos;

// FORWARD REFERENCES
class locale;
template <class _Facet>
const _Facet& __CRTDECL use_facet(const locale&);

template <class _Elem>
struct char_traits;
template <>
struct char_traits<char>;
#ifdef __cpp_char8_t
template <>
struct char_traits<char8_t>;
#endif // __cpp_char8_t
template <>
struct char_traits<char16_t>;
template <>
struct char_traits<char32_t>;
template <>
struct char_traits<wchar_t>;
#ifdef _NATIVE_WCHAR_T_DEFINED
template <>
struct char_traits<unsigned short>;
#endif // _NATIVE_WCHAR_T_DEFINED

template <class _Ty>
class allocator;
class ios_base;
template <class _Elem, class _Traits = char_traits<_Elem>>
class basic_ios;
template <class _Elem, class _Traits = char_traits<_Elem>>
class istreambuf_iterator;
template <class _Elem, class _Traits = char_traits<_Elem>>
class ostreambuf_iterator;
template <class _Elem, class _Traits = char_traits<_Elem>>
class basic_streambuf;

#pragma vtordisp(push, 2) // compiler bug workaround
template <class _Elem, class _Traits = char_traits<_Elem>>
class basic_istream;
template <class _Elem, class _Traits = char_traits<_Elem>>
class basic_ostream;
#pragma vtordisp(pop) // compiler bug workaround

template <class _Elem, class _Traits = char_traits<_Elem>>
class basic_iostream;
template <class _Elem, class _Traits = char_traits<_Elem>, class _Alloc = allocator<_Elem>>
class basic_stringbuf;
template <class _Elem, class _Traits = char_traits<_Elem>, class _Alloc = allocator<_Elem>>
class basic_istringstream;
template <class _Elem, class _Traits = char_traits<_Elem>, class _Alloc = allocator<_Elem>>
class basic_ostringstream;
template <class _Elem, class _Traits = char_traits<_Elem>, class _Alloc = allocator<_Elem>>
class basic_stringstream;
template <class _Elem, class _Traits = char_traits<_Elem>>
class basic_filebuf;
template <class _Elem, class _Traits = char_traits<_Elem>>
class basic_ifstream;
template <class _Elem, class _Traits = char_traits<_Elem>>
class basic_ofstream;
template <class _Elem, class _Traits = char_traits<_Elem>>
class basic_fstream;

#if defined(_DLL_CPPLIB)
template <class _Elem, class _InIt>
class num_get;
template <class _Elem, class _OutIt>
class num_put;
template <class _Elem>
class collate;
#endif // defined(_DLL_CPPLIB)

// char TYPEDEFS
using ios           = basic_ios<char, char_traits<char>>;
using streambuf     = basic_streambuf<char, char_traits<char>>;
using istream       = basic_istream<char, char_traits<char>>;
using ostream       = basic_ostream<char, char_traits<char>>;
using iostream      = basic_iostream<char, char_traits<char>>;
using stringbuf     = basic_stringbuf<char, char_traits<char>, allocator<char>>;
using istringstream = basic_istringstream<char, char_traits<char>, allocator<char>>;
using ostringstream = basic_ostringstream<char, char_traits<char>, allocator<char>>;
using stringstream  = basic_stringstream<char, char_traits<char>, allocator<char>>;
using filebuf       = basic_filebuf<char, char_traits<char>>;
using ifstream      = basic_ifstream<char, char_traits<char>>;
using ofstream      = basic_ofstream<char, char_traits<char>>;
using fstream       = basic_fstream<char, char_traits<char>>;

// wchar_t TYPEDEFS
using wios           = basic_ios<wchar_t, char_traits<wchar_t>>;
using wstreambuf     = basic_streambuf<wchar_t, char_traits<wchar_t>>;
using wistream       = basic_istream<wchar_t, char_traits<wchar_t>>;
using wostream       = basic_ostream<wchar_t, char_traits<wchar_t>>;
using wiostream      = basic_iostream<wchar_t, char_traits<wchar_t>>;
using wstringbuf     = basic_stringbuf<wchar_t, char_traits<wchar_t>, allocator<wchar_t>>;
using wistringstream = basic_istringstream<wchar_t, char_traits<wchar_t>, allocator<wchar_t>>;
using wostringstream = basic_ostringstream<wchar_t, char_traits<wchar_t>, allocator<wchar_t>>;
using wstringstream  = basic_stringstream<wchar_t, char_traits<wchar_t>, allocator<wchar_t>>;
using wfilebuf       = basic_filebuf<wchar_t, char_traits<wchar_t>>;
using wifstream      = basic_ifstream<wchar_t, char_traits<wchar_t>>;
using wofstream      = basic_ofstream<wchar_t, char_traits<wchar_t>>;
using wfstream       = basic_fstream<wchar_t, char_traits<wchar_t>>;

#if defined(_CRTBLD)
// unsigned short TYPEDEFS
using ushistream = basic_istream<unsigned short, char_traits<unsigned short>>;
using ushostream = basic_ostream<unsigned short, char_traits<unsigned short>>;
using ushfilebuf = basic_filebuf<unsigned short, char_traits<unsigned short>>;
#endif // defined(_CRTBLD)
_STD_END

#pragma pop_macro("new")
_STL_RESTORE_CLANG_WARNINGS
#pragma warning(pop)
#pragma pack(pop)
#endif // _STL_COMPILER_PREPROCESSOR
#endif // _IOSFWD_