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 // -*- 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___CXX03_FSTREAM
 #define _LIBCPP___CXX03_FSTREAM
 
 /*
     fstream synopsis
 
 template <class charT, class traits = char_traits<charT> >
 class basic_filebuf
     : public basic_streambuf<charT, traits>
 {
 public:
     typedef charT                          char_type;
     typedef traits                         traits_type;
     typedef typename traits_type::int_type int_type;
     typedef typename traits_type::pos_type pos_type;
     typedef typename traits_type::off_type off_type;
 
     // 27.9.1.2 Constructors/destructor:
     basic_filebuf();
     basic_filebuf(basic_filebuf&& rhs);
     virtual ~basic_filebuf();
 
     // 27.9.1.3 Assign/swap:
     basic_filebuf& operator=(basic_filebuf&& rhs);
     void swap(basic_filebuf& rhs);
 
     // 27.9.1.4 Members:
     bool is_open() const;
     basic_filebuf* open(const char* s, ios_base::openmode mode);
     basic_filebuf* open(const string& s, ios_base::openmode mode);
     basic_filebuf* open(const filesystem::path& p, ios_base::openmode mode); // C++17
     basic_filebuf* close();
 
 protected:
     // 27.9.1.5 Overridden virtual functions:
     virtual streamsize showmanyc();
     virtual int_type underflow();
     virtual int_type uflow();
     virtual int_type pbackfail(int_type c = traits_type::eof());
     virtual int_type overflow (int_type c = traits_type::eof());
     virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* s, streamsize n);
     virtual pos_type seekoff(off_type off, ios_base::seekdir way,
                              ios_base::openmode which = ios_base::in | ios_base::out);
     virtual pos_type seekpos(pos_type sp,
                              ios_base::openmode which = ios_base::in | ios_base::out);
     virtual int sync();
     virtual void imbue(const locale& loc);
 };
 
 template <class charT, class traits>
   void
   swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y);
 
 typedef basic_filebuf<char>    filebuf;
 typedef basic_filebuf<wchar_t> wfilebuf;
 
 template <class charT, class traits = char_traits<charT> >
 class basic_ifstream
     : public basic_istream<charT,traits>
 {
 public:
     typedef charT                          char_type;
     typedef traits                         traits_type;
     typedef typename traits_type::int_type int_type;
     typedef typename traits_type::pos_type pos_type;
     typedef typename traits_type::off_type off_type;
     using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
 
     basic_ifstream();
     explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in);
     explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in);
     template<class T>
     explicit basic_ifstream(const T& s, ios_base::openmode mode = ios_base::in); // Since C++17
     basic_ifstream(basic_ifstream&& rhs);
 
     basic_ifstream& operator=(basic_ifstream&& rhs);
     void swap(basic_ifstream& rhs);
 
     basic_filebuf<char_type, traits_type>* rdbuf() const;
     native_handle_type native_handle() const noexcept; // Since C++26
     bool is_open() const;
     void open(const char* s, ios_base::openmode mode = ios_base::in);
     void open(const string& s, ios_base::openmode mode = ios_base::in);
     void open(const filesystem::path& s, ios_base::openmode mode = ios_base::in); // C++17
 
     void close();
 };
 
 template <class charT, class traits>
   void
   swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y);
 
 typedef basic_ifstream<char>    ifstream;
 typedef basic_ifstream<wchar_t> wifstream;
 
 template <class charT, class traits = char_traits<charT> >
 class basic_ofstream
     : public basic_ostream<charT,traits>
 {
 public:
     typedef charT                          char_type;
     typedef traits                         traits_type;
     typedef typename traits_type::int_type int_type;
     typedef typename traits_type::pos_type pos_type;
     typedef typename traits_type::off_type off_type;
     using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
 
     basic_ofstream();
     explicit basic_ofstream(const char* s, ios_base::openmode mode = ios_base::out);
     explicit basic_ofstream(const string& s, ios_base::openmode mode = ios_base::out);
     template<class T>
     explicit basic_ofstream(const T& s, ios_base::openmode mode = ios_base::out); // Since C++17
     basic_ofstream(basic_ofstream&& rhs);
 
     basic_ofstream& operator=(basic_ofstream&& rhs);
     void swap(basic_ofstream& rhs);
 
     basic_filebuf<char_type, traits_type>* rdbuf() const;
     native_handle_type native_handle() const noexcept; // Since C++26
 
     bool is_open() const;
     void open(const char* s, ios_base::openmode mode = ios_base::out);
     void open(const string& s, ios_base::openmode mode = ios_base::out);
     void open(const filesystem::path& p,
               ios_base::openmode mode = ios_base::out); // C++17
 
     void close();
 };
 
 template <class charT, class traits>
   void
   swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y);
 
 typedef basic_ofstream<char>    ofstream;
 typedef basic_ofstream<wchar_t> wofstream;
 
 template <class charT, class traits=char_traits<charT> >
 class basic_fstream
     : public basic_iostream<charT,traits>
 {
 public:
     typedef charT                          char_type;
     typedef traits                         traits_type;
     typedef typename traits_type::int_type int_type;
     typedef typename traits_type::pos_type pos_type;
     typedef typename traits_type::off_type off_type;
     using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
 
     basic_fstream();
     explicit basic_fstream(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
     explicit basic_fstream(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
     template<class T>
     explicit basic_fstream(const T& s, ios_base::openmode mode = ios_base::in | ios_base::out); // Since C++17
     basic_fstream(basic_fstream&& rhs);
 
     basic_fstream& operator=(basic_fstream&& rhs);
     void swap(basic_fstream& rhs);
 
     basic_filebuf<char_type, traits_type>* rdbuf() const;
     native_handle_type native_handle() const noexcept; // Since C++26
     bool is_open() const;
     void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
     void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
     void open(const filesystem::path& s,
               ios_base::openmode mode = ios_base::in|ios_base::out); // C++17
 
     void close();
 };
 
 template <class charT, class traits>
   void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y);
 
 typedef basic_fstream<char>    fstream;
 typedef basic_fstream<wchar_t> wfstream;
 
 }  // std
 
 */
 
 #include <__cxx03/__algorithm/max.h>
 #include <__cxx03/__assert>
 #include <__cxx03/__config>
 #include <__cxx03/__fwd/fstream.h>
 #include <__cxx03/__locale>
 #include <__cxx03/__type_traits/enable_if.h>
 #include <__cxx03/__type_traits/is_same.h>
 #include <__cxx03/__utility/move.h>
 #include <__cxx03/__utility/swap.h>
 #include <__cxx03/__utility/unreachable.h>
 #include <__cxx03/cstdio>
 #include <__cxx03/filesystem>
 #include <__cxx03/istream>
 #include <__cxx03/ostream>
 #include <__cxx03/typeinfo>
 #include <__cxx03/version>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_PUSH_MACROS
 #include <__cxx03/__undef_macros>
 
 #if defined(_LIBCPP_MSVCRT) || defined(_NEWLIB_VERSION)
 #  define _LIBCPP_HAS_NO_OFF_T_FUNCTIONS
 #endif
 
 #if !defined(_LIBCPP_HAS_NO_FILESYSTEM)
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 #  if _LIBCPP_STD_VER >= 26 && defined(_LIBCPP_WIN32API)
 _LIBCPP_EXPORTED_FROM_ABI void* __filebuf_windows_native_handle(FILE* __file) noexcept;
 #  endif
 
 template <class _CharT, class _Traits>
 class _LIBCPP_TEMPLATE_VIS basic_filebuf : public basic_streambuf<_CharT, _Traits> {
 public:
   typedef _CharT char_type;
   typedef _Traits traits_type;
   typedef typename traits_type::int_type int_type;
   typedef typename traits_type::pos_type pos_type;
   typedef typename traits_type::off_type off_type;
   typedef typename traits_type::state_type state_type;
 #  if _LIBCPP_STD_VER >= 26
 #    if defined(_LIBCPP_WIN32API)
   using native_handle_type = void*; // HANDLE
 #    elif __has_include(<unistd.h>)
   using native_handle_type = int; // POSIX file descriptor
 #    else
 #      error "Provide a native file handle!"
 #    endif
 #  endif
 
   // 27.9.1.2 Constructors/destructor:
   basic_filebuf();
   basic_filebuf(basic_filebuf&& __rhs);
   ~basic_filebuf() override;
 
   // 27.9.1.3 Assign/swap:
   _LIBCPP_HIDE_FROM_ABI basic_filebuf& operator=(basic_filebuf&& __rhs);
   void swap(basic_filebuf& __rhs);
 
   // 27.9.1.4 Members:
   _LIBCPP_HIDE_FROM_ABI bool is_open() const;
   basic_filebuf* open(const char* __s, ios_base::openmode __mode);
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
   basic_filebuf* open(const wchar_t* __s, ios_base::openmode __mode);
 #  endif
   _LIBCPP_HIDE_FROM_ABI basic_filebuf* open(const string& __s, ios_base::openmode __mode);
 
 #  if _LIBCPP_STD_VER >= 17
   _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI basic_filebuf*
   open(const filesystem::path& __p, ios_base::openmode __mode) {
     return open(__p.c_str(), __mode);
   }
 #  endif
   _LIBCPP_HIDE_FROM_ABI basic_filebuf* __open(int __fd, ios_base::openmode __mode);
   basic_filebuf* close();
 #  if _LIBCPP_STD_VER >= 26
   _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept {
     _LIBCPP_ASSERT_UNCATEGORIZED(this->is_open(), "File must be opened");
 #    if defined(_LIBCPP_WIN32API)
     return std::__filebuf_windows_native_handle(__file_);
 #    elif __has_include(<unistd.h>)
     return fileno(__file_);
 #    else
 #      error "Provide a way to determine the file native handle!"
 #    endif
   }
 #  endif //  _LIBCPP_STD_VER >= 26
 
   _LIBCPP_HIDE_FROM_ABI inline static const char* __make_mdstring(ios_base::openmode __mode) _NOEXCEPT;
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
   _LIBCPP_HIDE_FROM_ABI inline static const wchar_t* __make_mdwstring(ios_base::openmode __mode) _NOEXCEPT;
 #  endif
 
 protected:
   // 27.9.1.5 Overridden virtual functions:
   int_type underflow() override;
   int_type pbackfail(int_type __c = traits_type::eof()) override;
   int_type overflow(int_type __c = traits_type::eof()) override;
   basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n) override;
   pos_type
   seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __wch = ios_base::in | ios_base::out) override;
   pos_type seekpos(pos_type __sp, ios_base::openmode __wch = ios_base::in | ios_base::out) override;
   int sync() override;
   void imbue(const locale& __loc) override;
 
 private:
   char* __extbuf_;
   const char* __extbufnext_;
   const char* __extbufend_;
   char __extbuf_min_[8];
   size_t __ebs_;
   char_type* __intbuf_;
   size_t __ibs_;
   FILE* __file_;
   const codecvt<char_type, char, state_type>* __cv_;
   state_type __st_;
   state_type __st_last_;
   ios_base::openmode __om_;
   // There have been no file operations yet, which allows setting unbuffered
   // I/O mode.
   static const ios_base::openmode __no_io_operations = ios_base::trunc;
   // Unbuffered I/O mode has been requested.
   static const ios_base::openmode __use_unbuffered_io = ios_base::ate;
   // Used to track the currently used mode and track whether the output should
   // be unbuffered.
   // [filebuf.virtuals]/12
   //   If setbuf(0, 0) is called on a stream before any I/O has occurred on
   //   that stream, the stream becomes unbuffered. Otherwise the results are
   //   implementation-defined.
   // This allows calling setbuf(0, 0)
   // - before opening a file,
   // - after opening a file, before
   //   - a read
   //   - a write
   //   - a seek.
   // Note that opening a file with ios_base::ate does a seek operation.
   // Normally underflow, overflow, and sync change this flag to ios_base::in,
   // ios_base_out, or 0.
   //
   // The ios_base::trunc and ios_base::ate flags are not used in __cm_. They
   // are used to track the state of the unbuffered request. For readability
   // they have the aliases __no_io_operations and __use_unbuffered_io
   // respectively.
   //
   // The __no_io_operations and __use_unbuffered_io flags are used in the
   // following way:
   // - __no_io_operations is set upon construction to indicate the unbuffered
   //   state can be set.
   // - When requesting unbuffered output:
   //   - If the file is open it sets the mode.
   //   - Else places a request by adding the __use_unbuffered_io flag.
   // - When a file is opened it checks whether both __no_io_operations and
   //   __use_unbuffered_io are set. If so switches to unbuffered mode.
   // - All file I/O operations change the mode effectively clearing the
   //   __no_io_operations and __use_unbuffered_io flags.
   ios_base::openmode __cm_;
   bool __owns_eb_;
   bool __owns_ib_;
   bool __always_noconv_;
 
   bool __read_mode();
   void __write_mode();
 
   _LIBCPP_EXPORTED_FROM_ABI friend FILE* __get_ostream_file(ostream&);
 
   // There are multiple (__)open function, they use different C-API open
   // function. After that call these functions behave the same. This function
   // does that part and determines the final return value.
   _LIBCPP_HIDE_FROM_ABI basic_filebuf* __do_open(FILE* __file, ios_base::openmode __mode) {
     __file_ = __file;
     if (!__file_)
       return nullptr;
 
     __om_ = __mode;
     if (__cm_ == (__no_io_operations | __use_unbuffered_io)) {
       std::setbuf(__file_, nullptr);
       __cm_ = 0;
     }
 
     if (__mode & ios_base::ate) {
       __cm_ = 0;
       if (fseek(__file_, 0, SEEK_END)) {
         fclose(__file_);
         __file_ = nullptr;
         return nullptr;
       }
     }
 
     return this;
   }
 
   // If the file is already open, switch to unbuffered mode. Otherwise, record
   // the request to use unbuffered mode so that we use that mode when we
   // eventually open the file.
   _LIBCPP_HIDE_FROM_ABI void __request_unbuffered_mode(char_type* __s, streamsize __n) {
     if (__cm_ == __no_io_operations && __s == nullptr && __n == 0) {
       if (__file_) {
         std::setbuf(__file_, nullptr);
         __cm_ = 0;
       } else {
         __cm_ = __no_io_operations | __use_unbuffered_io;
       }
     }
   }
 };
 
 template <class _CharT, class _Traits>
 basic_filebuf<_CharT, _Traits>::basic_filebuf()
     : __extbuf_(nullptr),
       __extbufnext_(nullptr),
       __extbufend_(nullptr),
       __ebs_(0),
       __intbuf_(nullptr),
       __ibs_(0),
       __file_(nullptr),
       __cv_(nullptr),
       __st_(),
       __st_last_(),
       __om_(0),
       __cm_(__no_io_operations),
       __owns_eb_(false),
       __owns_ib_(false),
       __always_noconv_(false) {
   if (std::has_facet<codecvt<char_type, char, state_type> >(this->getloc())) {
     __cv_            = &std::use_facet<codecvt<char_type, char, state_type> >(this->getloc());
     __always_noconv_ = __cv_->always_noconv();
   }
   setbuf(nullptr, 4096);
 }
 
 template <class _CharT, class _Traits>
 basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs) : basic_streambuf<_CharT, _Traits>(__rhs) {
   if (__rhs.__extbuf_ == __rhs.__extbuf_min_) {
     __extbuf_     = __extbuf_min_;
     __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_);
     __extbufend_  = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_);
   } else {
     __extbuf_     = __rhs.__extbuf_;
     __extbufnext_ = __rhs.__extbufnext_;
     __extbufend_  = __rhs.__extbufend_;
   }
   __ebs_           = __rhs.__ebs_;
   __intbuf_        = __rhs.__intbuf_;
   __ibs_           = __rhs.__ibs_;
   __file_          = __rhs.__file_;
   __cv_            = __rhs.__cv_;
   __st_            = __rhs.__st_;
   __st_last_       = __rhs.__st_last_;
   __om_            = __rhs.__om_;
   __cm_            = __rhs.__cm_;
   __owns_eb_       = __rhs.__owns_eb_;
   __owns_ib_       = __rhs.__owns_ib_;
   __always_noconv_ = __rhs.__always_noconv_;
   if (__rhs.pbase()) {
     if (__rhs.pbase() == __rhs.__intbuf_)
       this->setp(__intbuf_, __intbuf_ + (__rhs.epptr() - __rhs.pbase()));
     else
       this->setp((char_type*)__extbuf_, (char_type*)__extbuf_ + (__rhs.epptr() - __rhs.pbase()));
     this->__pbump(__rhs.pptr() - __rhs.pbase());
   } else if (__rhs.eback()) {
     if (__rhs.eback() == __rhs.__intbuf_)
       this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()), __intbuf_ + (__rhs.egptr() - __rhs.eback()));
     else
       this->setg((char_type*)__extbuf_,
                  (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()),
                  (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback()));
   }
   __rhs.__extbuf_     = nullptr;
   __rhs.__extbufnext_ = nullptr;
   __rhs.__extbufend_  = nullptr;
   __rhs.__ebs_        = 0;
   __rhs.__intbuf_     = 0;
   __rhs.__ibs_        = 0;
   __rhs.__file_       = nullptr;
   __rhs.__st_         = state_type();
   __rhs.__st_last_    = state_type();
   __rhs.__om_         = 0;
   __rhs.__cm_         = 0;
   __rhs.__owns_eb_    = false;
   __rhs.__owns_ib_    = false;
   __rhs.setg(0, 0, 0);
   __rhs.setp(0, 0);
 }
 
 template <class _CharT, class _Traits>
 inline basic_filebuf<_CharT, _Traits>& basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs) {
   close();
   swap(__rhs);
   return *this;
 }
 
 template <class _CharT, class _Traits>
 basic_filebuf<_CharT, _Traits>::~basic_filebuf() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   try {
 #  endif // _LIBCPP_HAS_NO_EXCEPTIONS
     close();
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   } catch (...) {
   }
 #  endif // _LIBCPP_HAS_NO_EXCEPTIONS
   if (__owns_eb_)
     delete[] __extbuf_;
   if (__owns_ib_)
     delete[] __intbuf_;
 }
 
 template <class _CharT, class _Traits>
 void basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs) {
   basic_streambuf<char_type, traits_type>::swap(__rhs);
   if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_) {
     // Neither *this nor __rhs uses the small buffer, so we can simply swap the pointers.
     std::swap(__extbuf_, __rhs.__extbuf_);
     std::swap(__extbufnext_, __rhs.__extbufnext_);
     std::swap(__extbufend_, __rhs.__extbufend_);
   } else {
     ptrdiff_t __ln = __extbufnext_ ? __extbufnext_ - __extbuf_ : 0;
     ptrdiff_t __le = __extbufend_ ? __extbufend_ - __extbuf_ : 0;
     ptrdiff_t __rn = __rhs.__extbufnext_ ? __rhs.__extbufnext_ - __rhs.__extbuf_ : 0;
     ptrdiff_t __re = __rhs.__extbufend_ ? __rhs.__extbufend_ - __rhs.__extbuf_ : 0;
     if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_) {
       // *this uses the small buffer, but __rhs doesn't.
       __extbuf_       = __rhs.__extbuf_;
       __rhs.__extbuf_ = __rhs.__extbuf_min_;
       std::memmove(__rhs.__extbuf_min_, __extbuf_min_, sizeof(__extbuf_min_));
     } else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_) {
       // *this doesn't use the small buffer, but __rhs does.
       __rhs.__extbuf_ = __extbuf_;
       __extbuf_       = __extbuf_min_;
       std::memmove(__extbuf_min_, __rhs.__extbuf_min_, sizeof(__extbuf_min_));
     } else {
       // Both *this and __rhs use the small buffer.
       char __tmp[sizeof(__extbuf_min_)];
       std::memmove(__tmp, __extbuf_min_, sizeof(__extbuf_min_));
       std::memmove(__extbuf_min_, __rhs.__extbuf_min_, sizeof(__extbuf_min_));
       std::memmove(__rhs.__extbuf_min_, __tmp, sizeof(__extbuf_min_));
     }
     __extbufnext_       = __extbuf_ + __rn;
     __extbufend_        = __extbuf_ + __re;
     __rhs.__extbufnext_ = __rhs.__extbuf_ + __ln;
     __rhs.__extbufend_  = __rhs.__extbuf_ + __le;
   }
   std::swap(__ebs_, __rhs.__ebs_);
   std::swap(__intbuf_, __rhs.__intbuf_);
   std::swap(__ibs_, __rhs.__ibs_);
   std::swap(__file_, __rhs.__file_);
   std::swap(__cv_, __rhs.__cv_);
   std::swap(__st_, __rhs.__st_);
   std::swap(__st_last_, __rhs.__st_last_);
   std::swap(__om_, __rhs.__om_);
   std::swap(__cm_, __rhs.__cm_);
   std::swap(__owns_eb_, __rhs.__owns_eb_);
   std::swap(__owns_ib_, __rhs.__owns_ib_);
   std::swap(__always_noconv_, __rhs.__always_noconv_);
   if (this->eback() == (char_type*)__rhs.__extbuf_min_) {
     ptrdiff_t __n = this->gptr() - this->eback();
     ptrdiff_t __e = this->egptr() - this->eback();
     this->setg((char_type*)__extbuf_min_, (char_type*)__extbuf_min_ + __n, (char_type*)__extbuf_min_ + __e);
   } else if (this->pbase() == (char_type*)__rhs.__extbuf_min_) {
     ptrdiff_t __n = this->pptr() - this->pbase();
     ptrdiff_t __e = this->epptr() - this->pbase();
     this->setp((char_type*)__extbuf_min_, (char_type*)__extbuf_min_ + __e);
     this->__pbump(__n);
   }
   if (__rhs.eback() == (char_type*)__extbuf_min_) {
     ptrdiff_t __n = __rhs.gptr() - __rhs.eback();
     ptrdiff_t __e = __rhs.egptr() - __rhs.eback();
     __rhs.setg(
         (char_type*)__rhs.__extbuf_min_, (char_type*)__rhs.__extbuf_min_ + __n, (char_type*)__rhs.__extbuf_min_ + __e);
   } else if (__rhs.pbase() == (char_type*)__extbuf_min_) {
     ptrdiff_t __n = __rhs.pptr() - __rhs.pbase();
     ptrdiff_t __e = __rhs.epptr() - __rhs.pbase();
     __rhs.setp((char_type*)__rhs.__extbuf_min_, (char_type*)__rhs.__extbuf_min_ + __e);
     __rhs.__pbump(__n);
   }
 }
 
 template <class _CharT, class _Traits>
 inline _LIBCPP_HIDE_FROM_ABI void swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y) {
   __x.swap(__y);
 }
 
 template <class _CharT, class _Traits>
 inline bool basic_filebuf<_CharT, _Traits>::is_open() const {
   return __file_ != nullptr;
 }
 
 template <class _CharT, class _Traits>
 const char* basic_filebuf<_CharT, _Traits>::__make_mdstring(ios_base::openmode __mode) _NOEXCEPT {
   switch (__mode & ~ios_base::ate) {
   case ios_base::out:
   case ios_base::out | ios_base::trunc:
     return "w" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::out | ios_base::app:
   case ios_base::app:
     return "a" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in:
     return "r" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in | ios_base::out:
     return "r+" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in | ios_base::out | ios_base::trunc:
     return "w+" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in | ios_base::out | ios_base::app:
   case ios_base::in | ios_base::app:
     return "a+" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::out | ios_base::binary:
   case ios_base::out | ios_base::trunc | ios_base::binary:
     return "wb" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::out | ios_base::app | ios_base::binary:
   case ios_base::app | ios_base::binary:
     return "ab" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in | ios_base::binary:
     return "rb" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in | ios_base::out | ios_base::binary:
     return "r+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
     return "w+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
   case ios_base::in | ios_base::app | ios_base::binary:
     return "a+b" _LIBCPP_FOPEN_CLOEXEC_MODE;
 #  if _LIBCPP_STD_VER >= 23
   case ios_base::out | ios_base::noreplace:
   case ios_base::out | ios_base::trunc | ios_base::noreplace:
     return "wx" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in | ios_base::out | ios_base::trunc | ios_base::noreplace:
     return "w+x" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::out | ios_base::binary | ios_base::noreplace:
   case ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
     return "wbx" _LIBCPP_FOPEN_CLOEXEC_MODE;
   case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
     return "w+bx" _LIBCPP_FOPEN_CLOEXEC_MODE;
 #  endif // _LIBCPP_STD_VER >= 23
   default:
     return nullptr;
   }
   __libcpp_unreachable();
 }
 
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
 template <class _CharT, class _Traits>
 const wchar_t* basic_filebuf<_CharT, _Traits>::__make_mdwstring(ios_base::openmode __mode) _NOEXCEPT {
   switch (__mode & ~ios_base::ate) {
   case ios_base::out:
   case ios_base::out | ios_base::trunc:
     return L"w";
   case ios_base::out | ios_base::app:
   case ios_base::app:
     return L"a";
   case ios_base::in:
     return L"r";
   case ios_base::in | ios_base::out:
     return L"r+";
   case ios_base::in | ios_base::out | ios_base::trunc:
     return L"w+";
   case ios_base::in | ios_base::out | ios_base::app:
   case ios_base::in | ios_base::app:
     return L"a+";
   case ios_base::out | ios_base::binary:
   case ios_base::out | ios_base::trunc | ios_base::binary:
     return L"wb";
   case ios_base::out | ios_base::app | ios_base::binary:
   case ios_base::app | ios_base::binary:
     return L"ab";
   case ios_base::in | ios_base::binary:
     return L"rb";
   case ios_base::in | ios_base::out | ios_base::binary:
     return L"r+b";
   case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
     return L"w+b";
   case ios_base::in | ios_base::out | ios_base::app | ios_base::binary:
   case ios_base::in | ios_base::app | ios_base::binary:
     return L"a+b";
 #    if _LIBCPP_STD_VER >= 23
   case ios_base::out | ios_base::noreplace:
   case ios_base::out | ios_base::trunc | ios_base::noreplace:
     return L"wx";
   case ios_base::in | ios_base::out | ios_base::trunc | ios_base::noreplace:
     return L"w+x";
   case ios_base::out | ios_base::binary | ios_base::noreplace:
   case ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
     return L"wbx";
   case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace:
     return L"w+bx";
 #    endif // _LIBCPP_STD_VER >= 23
   default:
     return nullptr;
   }
   __libcpp_unreachable();
 }
 #  endif
 
 template <class _CharT, class _Traits>
 basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) {
   if (__file_)
     return nullptr;
   const char* __mdstr = __make_mdstring(__mode);
   if (!__mdstr)
     return nullptr;
 
   return __do_open(fopen(__s, __mdstr), __mode);
 }
 
 template <class _CharT, class _Traits>
 inline basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
   if (__file_)
     return nullptr;
   const char* __mdstr = __make_mdstring(__mode);
   if (!__mdstr)
     return nullptr;
 
   return __do_open(fdopen(__fd, __mdstr), __mode);
 }
 
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
 // This is basically the same as the char* overload except that it uses _wfopen
 // and long mode strings.
 template <class _CharT, class _Traits>
 basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) {
   if (__file_)
     return nullptr;
   const wchar_t* __mdstr = __make_mdwstring(__mode);
   if (!__mdstr)
     return nullptr;
 
   return __do_open(_wfopen(__s, __mdstr), __mode);
 }
 #  endif
 
 template <class _CharT, class _Traits>
 inline basic_filebuf<_CharT, _Traits>*
 basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) {
   return open(__s.c_str(), __mode);
 }
 
 template <class _CharT, class _Traits>
 basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::close() {
   basic_filebuf<_CharT, _Traits>* __rt = nullptr;
   if (__file_) {
     __rt = this;
     unique_ptr<FILE, int (*)(FILE*)> __h(__file_, fclose);
     if (sync())
       __rt = nullptr;
     if (fclose(__h.release()))
       __rt = nullptr;
     __file_ = nullptr;
     setbuf(0, 0);
   }
   return __rt;
 }
 
 template <class _CharT, class _Traits>
 typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::underflow() {
   if (__file_ == nullptr)
     return traits_type::eof();
   bool __initial = __read_mode();
   char_type __1buf;
   if (this->gptr() == nullptr)
     this->setg(&__1buf, &__1buf + 1, &__1buf + 1);
   const size_t __unget_sz = __initial ? 0 : std::min<size_t>((this->egptr() - this->eback()) / 2, 4);
   int_type __c            = traits_type::eof();
   if (this->gptr() == this->egptr()) {
     std::memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type));
     if (__always_noconv_) {
       size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz);
       __nmemb        = ::fread(this->eback() + __unget_sz, 1, __nmemb, __file_);
       if (__nmemb != 0) {
         this->setg(this->eback(), this->eback() + __unget_sz, this->eback() + __unget_sz + __nmemb);
         __c = traits_type::to_int_type(*this->gptr());
       }
     } else {
       if (__extbufend_ != __extbufnext_) {
         _LIBCPP_ASSERT_NON_NULL(__extbufnext_ != nullptr, "underflow moving from nullptr");
         _LIBCPP_ASSERT_NON_NULL(__extbuf_ != nullptr, "underflow moving into nullptr");
         std::memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
       }
       __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
       __extbufend_  = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
       size_t __nmemb =
           std::min(static_cast<size_t>(__ibs_ - __unget_sz), static_cast<size_t>(__extbufend_ - __extbufnext_));
       codecvt_base::result __r;
       __st_last_  = __st_;
       size_t __nr = fread((void*)const_cast<char*>(__extbufnext_), 1, __nmemb, __file_);
       if (__nr != 0) {
         if (!__cv_)
           __throw_bad_cast();
 
         __extbufend_ = __extbufnext_ + __nr;
         char_type* __inext;
         __r = __cv_->in(
             __st_, __extbuf_, __extbufend_, __extbufnext_, this->eback() + __unget_sz, this->eback() + __ibs_, __inext);
         if (__r == codecvt_base::noconv) {
           this->setg((char_type*)__extbuf_, (char_type*)__extbuf_, (char_type*)const_cast<char*>(__extbufend_));
           __c = traits_type::to_int_type(*this->gptr());
         } else if (__inext != this->eback() + __unget_sz) {
           this->setg(this->eback(), this->eback() + __unget_sz, __inext);
           __c = traits_type::to_int_type(*this->gptr());
         }
       }
     }
   } else
     __c = traits_type::to_int_type(*this->gptr());
   if (this->eback() == &__1buf)
     this->setg(nullptr, nullptr, nullptr);
   return __c;
 }
 
 template <class _CharT, class _Traits>
 typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c) {
   if (__file_ && this->eback() < this->gptr()) {
     if (traits_type::eq_int_type(__c, traits_type::eof())) {
       this->gbump(-1);
       return traits_type::not_eof(__c);
     }
     if ((__om_ & ios_base::out) || traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])) {
       this->gbump(-1);
       *this->gptr() = traits_type::to_char_type(__c);
       return __c;
     }
   }
   return traits_type::eof();
 }
 
 template <class _CharT, class _Traits>
 typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::overflow(int_type __c) {
   if (__file_ == nullptr)
     return traits_type::eof();
   __write_mode();
   char_type __1buf;
   char_type* __pb_save  = this->pbase();
   char_type* __epb_save = this->epptr();
   if (!traits_type::eq_int_type(__c, traits_type::eof())) {
     if (this->pptr() == nullptr)
       this->setp(&__1buf, &__1buf + 1);
     *this->pptr() = traits_type::to_char_type(__c);
     this->pbump(1);
   }
   if (this->pptr() != this->pbase()) {
     if (__always_noconv_) {
       size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
       if (std::fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb)
         return traits_type::eof();
     } else {
       char* __extbe = __extbuf_;
       codecvt_base::result __r;
       do {
         if (!__cv_)
           __throw_bad_cast();
 
         const char_type* __e;
         __r = __cv_->out(__st_, this->pbase(), this->pptr(), __e, __extbuf_, __extbuf_ + __ebs_, __extbe);
         if (__e == this->pbase())
           return traits_type::eof();
         if (__r == codecvt_base::noconv) {
           size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase());
           if (std::fwrite(this->pbase(), 1, __nmemb, __file_) != __nmemb)
             return traits_type::eof();
         } else if (__r == codecvt_base::ok || __r == codecvt_base::partial) {
           size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
           if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
             return traits_type::eof();
           if (__r == codecvt_base::partial) {
             this->setp(const_cast<char_type*>(__e), this->pptr());
             this->__pbump(this->epptr() - this->pbase());
           }
         } else
           return traits_type::eof();
       } while (__r == codecvt_base::partial);
     }
     this->setp(__pb_save, __epb_save);
   }
   return traits_type::not_eof(__c);
 }
 
 template <class _CharT, class _Traits>
 basic_streambuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n) {
   this->setg(nullptr, nullptr, nullptr);
   this->setp(nullptr, nullptr);
   __request_unbuffered_mode(__s, __n);
   if (__owns_eb_)
     delete[] __extbuf_;
   if (__owns_ib_)
     delete[] __intbuf_;
   __ebs_ = __n;
   if (__ebs_ > sizeof(__extbuf_min_)) {
     if (__always_noconv_ && __s) {
       __extbuf_  = (char*)__s;
       __owns_eb_ = false;
     } else {
       __extbuf_  = new char[__ebs_];
       __owns_eb_ = true;
     }
   } else {
     __extbuf_  = __extbuf_min_;
     __ebs_     = sizeof(__extbuf_min_);
     __owns_eb_ = false;
   }
   if (!__always_noconv_) {
     __ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_));
     if (__s && __ibs_ > sizeof(__extbuf_min_)) {
       __intbuf_  = __s;
       __owns_ib_ = false;
     } else {
       __intbuf_  = new char_type[__ibs_];
       __owns_ib_ = true;
     }
   } else {
     __ibs_     = 0;
     __intbuf_  = nullptr;
     __owns_ib_ = false;
   }
   return this;
 }
 
 template <class _CharT, class _Traits>
 typename basic_filebuf<_CharT, _Traits>::pos_type
 basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode) {
   if (!__cv_)
     __throw_bad_cast();
 
   int __width = __cv_->encoding();
   if (__file_ == nullptr || (__width <= 0 && __off != 0) || sync())
     return pos_type(off_type(-1));
   // __width > 0 || __off == 0
   int __whence;
   switch (__way) {
   case ios_base::beg:
     __whence = SEEK_SET;
     break;
   case ios_base::cur:
     __whence = SEEK_CUR;
     break;
   case ios_base::end:
     __whence = SEEK_END;
     break;
   default:
     return pos_type(off_type(-1));
   }
 #  if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
   if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
     return pos_type(off_type(-1));
   pos_type __r = ftell(__file_);
 #  else
   if (::fseeko(__file_, __width > 0 ? __width * __off : 0, __whence))
     return pos_type(off_type(-1));
   pos_type __r = ftello(__file_);
 #  endif
   __r.state(__st_);
   return __r;
 }
 
 template <class _CharT, class _Traits>
 typename basic_filebuf<_CharT, _Traits>::pos_type
 basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode) {
   if (__file_ == nullptr || sync())
     return pos_type(off_type(-1));
 #  if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
   if (fseek(__file_, __sp, SEEK_SET))
     return pos_type(off_type(-1));
 #  else
   if (::fseeko(__file_, __sp, SEEK_SET))
     return pos_type(off_type(-1));
 #  endif
   __st_ = __sp.state();
   return __sp;
 }
 
 template <class _CharT, class _Traits>
 int basic_filebuf<_CharT, _Traits>::sync() {
   if (__file_ == nullptr)
     return 0;
   if (!__cv_)
     __throw_bad_cast();
 
   if (__cm_ & ios_base::out) {
     if (this->pptr() != this->pbase())
       if (overflow() == traits_type::eof())
         return -1;
     codecvt_base::result __r;
     do {
       char* __extbe;
       __r            = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe);
       size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_);
       if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
         return -1;
     } while (__r == codecvt_base::partial);
     if (__r == codecvt_base::error)
       return -1;
     if (fflush(__file_))
       return -1;
   } else if (__cm_ & ios_base::in) {
     off_type __c;
     state_type __state = __st_last_;
     bool __update_st   = false;
     if (__always_noconv_)
       __c = this->egptr() - this->gptr();
     else {
       int __width = __cv_->encoding();
       __c         = __extbufend_ - __extbufnext_;
       if (__width > 0)
         __c += __width * (this->egptr() - this->gptr());
       else {
         if (this->gptr() != this->egptr()) {
           const int __off = __cv_->length(__state, __extbuf_, __extbufnext_, this->gptr() - this->eback());
           __c += __extbufnext_ - __extbuf_ - __off;
           __update_st = true;
         }
       }
     }
 #  if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
     if (fseek(__file_, -__c, SEEK_CUR))
       return -1;
 #  else
     if (::fseeko(__file_, -__c, SEEK_CUR))
       return -1;
 #  endif
     if (__update_st)
       __st_ = __state;
     __extbufnext_ = __extbufend_ = __extbuf_;
     this->setg(nullptr, nullptr, nullptr);
     __cm_ = 0;
   }
   return 0;
 }
 
 template <class _CharT, class _Traits>
 void basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc) {
   sync();
   __cv_            = &std::use_facet<codecvt<char_type, char, state_type> >(__loc);
   bool __old_anc   = __always_noconv_;
   __always_noconv_ = __cv_->always_noconv();
   if (__old_anc != __always_noconv_) {
     this->setg(nullptr, nullptr, nullptr);
     this->setp(nullptr, nullptr);
     // invariant, char_type is char, else we couldn't get here
     if (__always_noconv_) // need to dump __intbuf_
     {
       if (__owns_eb_)
         delete[] __extbuf_;
       __owns_eb_ = __owns_ib_;
       __ebs_     = __ibs_;
       __extbuf_  = (char*)__intbuf_;
       __ibs_     = 0;
       __intbuf_  = nullptr;
       __owns_ib_ = false;
     } else // need to obtain an __intbuf_.
     {      // If __extbuf_ is user-supplied, use it, else new __intbuf_
       if (!__owns_eb_ && __extbuf_ != __extbuf_min_) {
         __ibs_     = __ebs_;
         __intbuf_  = (char_type*)__extbuf_;
         __owns_ib_ = false;
         __extbuf_  = new char[__ebs_];
         __owns_eb_ = true;
       } else {
         __ibs_     = __ebs_;
         __intbuf_  = new char_type[__ibs_];
         __owns_ib_ = true;
       }
     }
   }
 }
 
 template <class _CharT, class _Traits>
 bool basic_filebuf<_CharT, _Traits>::__read_mode() {
   if (!(__cm_ & ios_base::in)) {
     this->setp(nullptr, nullptr);
     if (__always_noconv_)
       this->setg((char_type*)__extbuf_, (char_type*)__extbuf_ + __ebs_, (char_type*)__extbuf_ + __ebs_);
     else
       this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_);
     __cm_ = ios_base::in;
     return true;
   }
   return false;
 }
 
 template <class _CharT, class _Traits>
 void basic_filebuf<_CharT, _Traits>::__write_mode() {
   if (!(__cm_ & ios_base::out)) {
     this->setg(nullptr, nullptr, nullptr);
     if (__ebs_ > sizeof(__extbuf_min_)) {
       if (__always_noconv_)
         this->setp((char_type*)__extbuf_, (char_type*)__extbuf_ + (__ebs_ - 1));
       else
         this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1));
     } else
       this->setp(nullptr, nullptr);
     __cm_ = ios_base::out;
   }
 }
 
 // basic_ifstream
 
 template <class _CharT, class _Traits>
 class _LIBCPP_TEMPLATE_VIS basic_ifstream : public basic_istream<_CharT, _Traits> {
 public:
   typedef _CharT char_type;
   typedef _Traits traits_type;
   typedef typename traits_type::int_type int_type;
   typedef typename traits_type::pos_type pos_type;
   typedef typename traits_type::off_type off_type;
 #  if _LIBCPP_STD_VER >= 26
   using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type;
 #  endif
 
   _LIBCPP_HIDE_FROM_ABI basic_ifstream();
   _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
   _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
 #  endif
   _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in);
 #  if _LIBCPP_STD_VER >= 17
   template <class _Tp, class = enable_if_t<is_same_v<_Tp, filesystem::path>>>
   _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY
       _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const _Tp& __p, ios_base::openmode __mode = ios_base::in)
       : basic_ifstream(__p.c_str(), __mode) {}
 #  endif // _LIBCPP_STD_VER >= 17
   _LIBCPP_HIDE_FROM_ABI basic_ifstream(basic_ifstream&& __rhs);
   _LIBCPP_HIDE_FROM_ABI basic_ifstream& operator=(basic_ifstream&& __rhs);
   _LIBCPP_HIDE_FROM_ABI void swap(basic_ifstream& __rhs);
 
   _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
 #  if _LIBCPP_STD_VER >= 26
   _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); }
 #  endif
   _LIBCPP_HIDE_FROM_ABI bool is_open() const;
   void open(const char* __s, ios_base::openmode __mode = ios_base::in);
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
   void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in);
 #  endif
   void open(const string& __s, ios_base::openmode __mode = ios_base::in);
 #  if _LIBCPP_STD_VER >= 17
   _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI void
   open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in) {
     return open(__p.c_str(), __mode);
   }
 #  endif // _LIBCPP_STD_VER >= 17
 
   _LIBCPP_HIDE_FROM_ABI void __open(int __fd, ios_base::openmode __mode);
   _LIBCPP_HIDE_FROM_ABI void close();
 
 private:
   basic_filebuf<char_type, traits_type> __sb_;
 };
 
 template <class _CharT, class _Traits>
 inline basic_ifstream<_CharT, _Traits>::basic_ifstream() : basic_istream<char_type, traits_type>(&__sb_) {}
 
 template <class _CharT, class _Traits>
 inline basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode)
     : basic_istream<char_type, traits_type>(&__sb_) {
   if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
     this->setstate(ios_base::failbit);
 }
 
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
 template <class _CharT, class _Traits>
 inline basic_ifstream<_CharT, _Traits>::basic_ifstream(const wchar_t* __s, ios_base::openmode __mode)
     : basic_istream<char_type, traits_type>(&__sb_) {
   if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
     this->setstate(ios_base::failbit);
 }
 #  endif
 
 template <class _CharT, class _Traits>
 inline basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode)
     : basic_istream<char_type, traits_type>(&__sb_) {
   if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
     this->setstate(ios_base::failbit);
 }
 
 template <class _CharT, class _Traits>
 inline basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs)
     : basic_istream<char_type, traits_type>(std::move(__rhs)), __sb_(std::move(__rhs.__sb_)) {
   this->set_rdbuf(&__sb_);
 }
 
 template <class _CharT, class _Traits>
 inline basic_ifstream<_CharT, _Traits>& basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs) {
   basic_istream<char_type, traits_type>::operator=(std::move(__rhs));
   __sb_ = std::move(__rhs.__sb_);
   return *this;
 }
 
 template <class _CharT, class _Traits>
 inline void basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs) {
   basic_istream<char_type, traits_type>::swap(__rhs);
   __sb_.swap(__rhs.__sb_);
 }
 
 template <class _CharT, class _Traits>
 inline _LIBCPP_HIDE_FROM_ABI void swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y) {
   __x.swap(__y);
 }
 
 template <class _CharT, class _Traits>
 inline basic_filebuf<_CharT, _Traits>* basic_ifstream<_CharT, _Traits>::rdbuf() const {
   return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
 }
 
 template <class _CharT, class _Traits>
 inline bool basic_ifstream<_CharT, _Traits>::is_open() const {
   return __sb_.is_open();
 }
 
 template <class _CharT, class _Traits>
 void basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) {
   if (__sb_.open(__s, __mode | ios_base::in))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
 template <class _CharT, class _Traits>
 void basic_ifstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) {
   if (__sb_.open(__s, __mode | ios_base::in))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 #  endif
 
 template <class _CharT, class _Traits>
 void basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) {
   if (__sb_.open(__s, __mode | ios_base::in))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 
 template <class _CharT, class _Traits>
 inline void basic_ifstream<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
   if (__sb_.__open(__fd, __mode | ios_base::in))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 
 template <class _CharT, class _Traits>
 inline void basic_ifstream<_CharT, _Traits>::close() {
   if (__sb_.close() == 0)
     this->setstate(ios_base::failbit);
 }
 
 // basic_ofstream
 
 template <class _CharT, class _Traits>
 class _LIBCPP_TEMPLATE_VIS basic_ofstream : public basic_ostream<_CharT, _Traits> {
 public:
   typedef _CharT char_type;
   typedef _Traits traits_type;
   typedef typename traits_type::int_type int_type;
   typedef typename traits_type::pos_type pos_type;
   typedef typename traits_type::off_type off_type;
 #  if _LIBCPP_STD_VER >= 26
   using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type;
 #  endif
 
   _LIBCPP_HIDE_FROM_ABI basic_ofstream();
   _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
   _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
 #  endif
   _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out);
 
 #  if _LIBCPP_STD_VER >= 17
   template <class _Tp, class = enable_if_t<is_same_v<_Tp, filesystem::path>>>
   _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY
       _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const _Tp& __p, ios_base::openmode __mode = ios_base::out)
       : basic_ofstream(__p.c_str(), __mode) {}
 #  endif // _LIBCPP_STD_VER >= 17
 
   _LIBCPP_HIDE_FROM_ABI basic_ofstream(basic_ofstream&& __rhs);
   _LIBCPP_HIDE_FROM_ABI basic_ofstream& operator=(basic_ofstream&& __rhs);
   _LIBCPP_HIDE_FROM_ABI void swap(basic_ofstream& __rhs);
 
   _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
 #  if _LIBCPP_STD_VER >= 26
   _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); }
 #  endif
   _LIBCPP_HIDE_FROM_ABI bool is_open() const;
   void open(const char* __s, ios_base::openmode __mode = ios_base::out);
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
   void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::out);
 #  endif
   void open(const string& __s, ios_base::openmode __mode = ios_base::out);
 
 #  if _LIBCPP_STD_VER >= 17
   _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI void
   open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::out) {
     return open(__p.c_str(), __mode);
   }
 #  endif // _LIBCPP_STD_VER >= 17
 
   _LIBCPP_HIDE_FROM_ABI void __open(int __fd, ios_base::openmode __mode);
   _LIBCPP_HIDE_FROM_ABI void close();
 
 private:
   basic_filebuf<char_type, traits_type> __sb_;
 };
 
 template <class _CharT, class _Traits>
 inline basic_ofstream<_CharT, _Traits>::basic_ofstream() : basic_ostream<char_type, traits_type>(&__sb_) {}
 
 template <class _CharT, class _Traits>
 inline basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode)
     : basic_ostream<char_type, traits_type>(&__sb_) {
   if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
     this->setstate(ios_base::failbit);
 }
 
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
 template <class _CharT, class _Traits>
 inline basic_ofstream<_CharT, _Traits>::basic_ofstream(const wchar_t* __s, ios_base::openmode __mode)
     : basic_ostream<char_type, traits_type>(&__sb_) {
   if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
     this->setstate(ios_base::failbit);
 }
 #  endif
 
 template <class _CharT, class _Traits>
 inline basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode)
     : basic_ostream<char_type, traits_type>(&__sb_) {
   if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
     this->setstate(ios_base::failbit);
 }
 
 template <class _CharT, class _Traits>
 inline basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs)
     : basic_ostream<char_type, traits_type>(std::move(__rhs)), __sb_(std::move(__rhs.__sb_)) {
   this->set_rdbuf(&__sb_);
 }
 
 template <class _CharT, class _Traits>
 inline basic_ofstream<_CharT, _Traits>& basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs) {
   basic_ostream<char_type, traits_type>::operator=(std::move(__rhs));
   __sb_ = std::move(__rhs.__sb_);
   return *this;
 }
 
 template <class _CharT, class _Traits>
 inline void basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs) {
   basic_ostream<char_type, traits_type>::swap(__rhs);
   __sb_.swap(__rhs.__sb_);
 }
 
 template <class _CharT, class _Traits>
 inline _LIBCPP_HIDE_FROM_ABI void swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y) {
   __x.swap(__y);
 }
 
 template <class _CharT, class _Traits>
 inline basic_filebuf<_CharT, _Traits>* basic_ofstream<_CharT, _Traits>::rdbuf() const {
   return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
 }
 
 template <class _CharT, class _Traits>
 inline bool basic_ofstream<_CharT, _Traits>::is_open() const {
   return __sb_.is_open();
 }
 
 template <class _CharT, class _Traits>
 void basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) {
   if (__sb_.open(__s, __mode | ios_base::out))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
 template <class _CharT, class _Traits>
 void basic_ofstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) {
   if (__sb_.open(__s, __mode | ios_base::out))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 #  endif
 
 template <class _CharT, class _Traits>
 void basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) {
   if (__sb_.open(__s, __mode | ios_base::out))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 
 template <class _CharT, class _Traits>
 inline void basic_ofstream<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
   if (__sb_.__open(__fd, __mode | ios_base::out))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 
 template <class _CharT, class _Traits>
 inline void basic_ofstream<_CharT, _Traits>::close() {
   if (__sb_.close() == nullptr)
     this->setstate(ios_base::failbit);
 }
 
 // basic_fstream
 
 template <class _CharT, class _Traits>
 class _LIBCPP_TEMPLATE_VIS basic_fstream : public basic_iostream<_CharT, _Traits> {
 public:
   typedef _CharT char_type;
   typedef _Traits traits_type;
   typedef typename traits_type::int_type int_type;
   typedef typename traits_type::pos_type pos_type;
   typedef typename traits_type::off_type off_type;
 #  if _LIBCPP_STD_VER >= 26
   using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type;
 #  endif
 
   _LIBCPP_HIDE_FROM_ABI basic_fstream();
   _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const char* __s,
                                                ios_base::openmode __mode = ios_base::in | ios_base::out);
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
   _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const wchar_t* __s,
                                                ios_base::openmode __mode = ios_base::in | ios_base::out);
 #  endif
   _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const string& __s,
                                                ios_base::openmode __mode = ios_base::in | ios_base::out);
 
 #  if _LIBCPP_STD_VER >= 17
   template <class _Tp, class = enable_if_t<is_same_v<_Tp, filesystem::path>>>
   _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(
       const _Tp& __p, ios_base::openmode __mode = ios_base::in | ios_base::out)
       : basic_fstream(__p.c_str(), __mode) {}
 #  endif // _LIBCPP_STD_VER >= 17
 
   _LIBCPP_HIDE_FROM_ABI basic_fstream(basic_fstream&& __rhs);
 
   _LIBCPP_HIDE_FROM_ABI basic_fstream& operator=(basic_fstream&& __rhs);
 
   _LIBCPP_HIDE_FROM_ABI void swap(basic_fstream& __rhs);
 
   _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
 #  if _LIBCPP_STD_VER >= 26
   _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); }
 #  endif
   _LIBCPP_HIDE_FROM_ABI bool is_open() const;
   _LIBCPP_HIDE_FROM_ABI void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
   void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
 #  endif
   _LIBCPP_HIDE_FROM_ABI void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
 
 #  if _LIBCPP_STD_VER >= 17
   _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI void
   open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in | ios_base::out) {
     return open(__p.c_str(), __mode);
   }
 #  endif // _LIBCPP_STD_VER >= 17
 
   _LIBCPP_HIDE_FROM_ABI void close();
 
 private:
   basic_filebuf<char_type, traits_type> __sb_;
 };
 
 template <class _CharT, class _Traits>
 inline basic_fstream<_CharT, _Traits>::basic_fstream() : basic_iostream<char_type, traits_type>(&__sb_) {}
 
 template <class _CharT, class _Traits>
 inline basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode)
     : basic_iostream<char_type, traits_type>(&__sb_) {
   if (__sb_.open(__s, __mode) == nullptr)
     this->setstate(ios_base::failbit);
 }
 
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
 template <class _CharT, class _Traits>
 inline basic_fstream<_CharT, _Traits>::basic_fstream(const wchar_t* __s, ios_base::openmode __mode)
     : basic_iostream<char_type, traits_type>(&__sb_) {
   if (__sb_.open(__s, __mode) == nullptr)
     this->setstate(ios_base::failbit);
 }
 #  endif
 
 template <class _CharT, class _Traits>
 inline basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode)
     : basic_iostream<char_type, traits_type>(&__sb_) {
   if (__sb_.open(__s, __mode) == nullptr)
     this->setstate(ios_base::failbit);
 }
 
 template <class _CharT, class _Traits>
 inline basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs)
     : basic_iostream<char_type, traits_type>(std::move(__rhs)), __sb_(std::move(__rhs.__sb_)) {
   this->set_rdbuf(&__sb_);
 }
 
 template <class _CharT, class _Traits>
 inline basic_fstream<_CharT, _Traits>& basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs) {
   basic_iostream<char_type, traits_type>::operator=(std::move(__rhs));
   __sb_ = std::move(__rhs.__sb_);
   return *this;
 }
 
 template <class _CharT, class _Traits>
 inline void basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs) {
   basic_iostream<char_type, traits_type>::swap(__rhs);
   __sb_.swap(__rhs.__sb_);
 }
 
 template <class _CharT, class _Traits>
 inline _LIBCPP_HIDE_FROM_ABI void swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y) {
   __x.swap(__y);
 }
 
 template <class _CharT, class _Traits>
 inline basic_filebuf<_CharT, _Traits>* basic_fstream<_CharT, _Traits>::rdbuf() const {
   return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_);
 }
 
 template <class _CharT, class _Traits>
 inline bool basic_fstream<_CharT, _Traits>::is_open() const {
   return __sb_.is_open();
 }
 
 template <class _CharT, class _Traits>
 void basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) {
   if (__sb_.open(__s, __mode))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 
 #  ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
 template <class _CharT, class _Traits>
 void basic_fstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) {
   if (__sb_.open(__s, __mode))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 #  endif
 
 template <class _CharT, class _Traits>
 void basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) {
   if (__sb_.open(__s, __mode))
     this->clear();
   else
     this->setstate(ios_base::failbit);
 }
 
 template <class _CharT, class _Traits>
 inline void basic_fstream<_CharT, _Traits>::close() {
   if (__sb_.close() == nullptr)
     this->setstate(ios_base::failbit);
 }
 
 #  if _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1
 extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ifstream<char>;
 extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ofstream<char>;
 extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_filebuf<char>;
 #  endif
 
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP_HAS_NO_FILESYSTEM
 
 _LIBCPP_POP_MACROS
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
 #  include <__cxx03/atomic>
 #  include <__cxx03/concepts>
 #  include <__cxx03/cstdlib>
 #  include <__cxx03/iosfwd>
 #  include <__cxx03/limits>
 #  include <__cxx03/mutex>
 #  include <__cxx03/new>
 #  include <__cxx03/stdexcept>
 #  include <__cxx03/type_traits>
 #endif
 
 #endif // _LIBCPP___CXX03_FSTREAM

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