Remove old code

Signed-off-by: Richard Qin <richard.qin.x@gmail.com>

1 files changed, 0 insertions, 1642 deletions

diff --git a/third_party/libcxx/include/c++/v1/fstream b/third_party/libcxx/include/c++/v1/fstream
deleted file mode 100644
index 4000be8..0000000
--- a/third_party/libcxx/include/c++/v1/fstream
+++ /dev/null
@@ -1,1642 +0,0 @@
-// -*- 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_FSTREAM
-#define _LIBCPP_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
-
-*/
-
-#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
-#  include <__cxx03/fstream>
-#else
-#  include <__config>
-
-#  if _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
-
-#    include <__algorithm/max.h>
-#    include <__assert>
-#    include <__filesystem/path.h>
-#    include <__fwd/fstream.h>
-#    include <__locale>
-#    include <__memory/addressof.h>
-#    include <__memory/unique_ptr.h>
-#    include <__ostream/basic_ostream.h>
-#    include <__type_traits/enable_if.h>
-#    include <__type_traits/is_same.h>
-#    include <__utility/move.h>
-#    include <__utility/swap.h>
-#    include <__utility/unreachable.h>
-#    include <cstdio>
-#    include <istream>
-#    include <streambuf>
-#    include <typeinfo>
-#    include <version>
-
-#    if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-#      pragma GCC system_header
-#    endif
-
-_LIBCPP_PUSH_MACROS
-#    include <__undef_macros>
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-#    if _LIBCPP_STD_VER >= 23 && defined(_LIBCPP_WIN32API)
-_LIBCPP_EXPORTED_FROM_ABI void* __filebuf_windows_native_handle(FILE* __file) noexcept;
-#    endif
-
-template <class _CharT, class _Traits>
-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;
-  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:
-  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI bool is_open() const;
-  basic_filebuf* open(const char* __s, ios_base::openmode __mode);
-#    if _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_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
-  [[nodiscard]] _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;
-#    if _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;
-
-  _LIBCPP_HIDE_FROM_ABI_VIRTUAL streamsize xsputn(const char_type* __str, streamsize __len) override {
-    if (__always_noconv_ && __len >= (this->epptr() - this->pbase())) {
-      if (traits_type::eq_int_type(overflow(), traits_type::eof()))
-        return 0;
-
-      return std::fwrite(__str, sizeof(char_type), __len, __file_);
-    }
-    return basic_streambuf<_CharT, _Traits>::xsputn(__str, __len);
-  }
-
-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_HIDE_FROM_ABI static int __fseek(FILE* __file, pos_type __offset, int __whence);
-  _LIBCPP_HIDE_FROM_ABI static pos_type __ftell(FILE* __file);
-
-  _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() {
-    if (__file_) {
-      std::setbuf(__file_, nullptr);
-      __cm_ = 0;
-    } else {
-      __cm_ = __no_io_operations | __use_unbuffered_io;
-    }
-  }
-
-  _LIBCPP_HIDE_FROM_ABI typename traits_type::int_type __overflow_failed() {
-    if (this->pptr() == this->epptr() + 1) {
-      this->pbump(-1); // lose the character we overflowed above -- we don't really have a
-                       // choice since we couldn't commit the contents of the put area
-    }
-    return traits_type::eof();
-  }
-};
-
-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::addressof(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() {
-#    if _LIBCPP_HAS_EXCEPTIONS
-  try {
-#    endif // _LIBCPP_HAS_EXCEPTIONS
-    close();
-#    if _LIBCPP_HAS_EXCEPTIONS
-  } catch (...) {
-  }
-#    endif // _LIBCPP_HAS_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();
-}
-
-#    if _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(std::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);
-}
-
-#    if _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;
-    // Reset the get and the put areas without getting rid of the underlying buffers,
-    // which might have been configured by the user. Make sure to keep the buffers
-    // since the user may re-open the stream.
-    this->setg(nullptr, nullptr, nullptr);
-    this->setp(nullptr, nullptr);
-    __cm_ = __no_io_operations;
-  }
-  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(std::addressof(__1buf), std::addressof(__1buf) + 1, std::addressof(__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        = std::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 = std::fread((void*)const_cast<char*>(__extbufnext_), 1, __nmemb, __file_);
-      if (__nr != 0) {
-        if (!__cv_)
-          std::__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() == std::addressof(__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(std::addressof(__1buf), std::addressof(__1buf) + 1);
-    *this->pptr() = traits_type::to_char_type(__c);
-    this->pbump(1);
-  }
-
-  // There is nothing to write, early return
-  if (this->pptr() == this->pbase()) {
-    return traits_type::not_eof(__c);
-  }
-
-  if (__always_noconv_) {
-    size_t __n = static_cast<size_t>(this->pptr() - this->pbase());
-    if (std::fwrite(this->pbase(), sizeof(char_type), __n, __file_) != __n) {
-      return __overflow_failed();
-    }
-  } else {
-    if (!__cv_)
-      std::__throw_bad_cast();
-
-    // See [filebuf.virtuals]
-    char_type* __b = this->pbase();
-    char_type* __p = this->pptr();
-    const char_type* __end;
-    char* __extbuf_end = __extbuf_;
-    do {
-      codecvt_base::result __r = __cv_->out(__st_, __b, __p, __end, __extbuf_, __extbuf_ + __ebs_, __extbuf_end);
-      if (__end == __b) {
-        return __overflow_failed();
-      }
-
-      // No conversion needed: output characters directly to the file, done.
-      if (__r == codecvt_base::noconv) {
-        size_t __n = static_cast<size_t>(__p - __b);
-        if (std::fwrite(__b, 1, __n, __file_) != __n) {
-          return __overflow_failed();
-        }
-        break;
-
-        // Conversion successful: output the converted characters to the file, done.
-      } else if (__r == codecvt_base::ok) {
-        size_t __n = static_cast<size_t>(__extbuf_end - __extbuf_);
-        if (std::fwrite(__extbuf_, 1, __n, __file_) != __n) {
-          return __overflow_failed();
-        }
-        break;
-
-        // Conversion partially successful: output converted characters to the file and repeat with the
-        // remaining characters.
-      } else if (__r == codecvt_base::partial) {
-        size_t __n = static_cast<size_t>(__extbuf_end - __extbuf_);
-        if (std::fwrite(__extbuf_, 1, __n, __file_) != __n) {
-          return __overflow_failed();
-        }
-        __b = const_cast<char_type*>(__end);
-        continue;
-
-      } else {
-        return __overflow_failed();
-      }
-    } while (true);
-  }
-  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);
-  // Calling setbuf(nullptr, 0) before any i/o operation switches the stream to unbuffered mode
-  if (__cm_ == __no_io_operations && __s == nullptr && __n == 0)
-    __request_unbuffered_mode();
-  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_)
-    std::__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 (__fseek(__file_, __width > 0 ? __width * __off : 0, __whence))
-    return pos_type(off_type(-1));
-  pos_type __r = __ftell(__file_);
-  __r.state(__st_);
-  return __r;
-}
-
-template <class _CharT, class _Traits>
-int basic_filebuf<_CharT, _Traits>::__fseek(FILE* __file, pos_type __offset, int __whence) {
-#    if defined(_LIBCPP_MSVCRT_LIKE)
-  return _fseeki64(__file, __offset, __whence);
-#    elif _LIBCPP_LIBC_NEWLIB
-  return fseek(__file, __offset, __whence);
-#    else
-  return ::fseeko(__file, __offset, __whence);
-#    endif
-}
-
-template <class _CharT, class _Traits>
-typename basic_filebuf<_CharT, _Traits>::pos_type basic_filebuf<_CharT, _Traits>::__ftell(FILE* __file) {
-#    if defined(_LIBCPP_MSVCRT_LIKE)
-  return _ftelli64(__file);
-#    elif _LIBCPP_LIBC_NEWLIB
-  return ftell(__file);
-#    else
-  return ftello(__file);
-#    endif
-}
-
-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 (__fseek(__file_, __sp, SEEK_SET))
-    return pos_type(off_type(-1));
-  __st_ = __sp.state();
-  return __sp;
-}
-
-template <class _CharT, class _Traits>
-int basic_filebuf<_CharT, _Traits>::sync() {
-  if (__file_ == nullptr)
-    return 0;
-  if (!__cv_)
-    std::__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 (std::fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb)
-        return -1;
-    } while (__r == codecvt_base::partial);
-    if (__r == codecvt_base::error)
-      return -1;
-    if (std::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 (__fseek(__file_, -__c, SEEK_CUR))
-      return -1;
-    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::addressof(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 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);
-#    if _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_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);
-
-  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
-#    if _LIBCPP_STD_VER >= 26
-  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept {
-    return rdbuf()->native_handle();
-  }
-#    endif
-  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI bool is_open() const;
-  void open(const char* __s, ios_base::openmode __mode = ios_base::in);
-#    if _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_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>(std::addressof(__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>(std::addressof(__sb_)) {
-  if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
-    this->setstate(ios_base::failbit);
-}
-
-#    if _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>(std::addressof(__sb_)) {
-  if (__sb_.open(__s, __mode | ios_base::in) == nullptr)
-    this->setstate(ios_base::failbit);
-}
-#    endif
-
-// extension
-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>(std::addressof(__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(std::addressof(__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>*>(std::addressof(__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);
-}
-
-#    if _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 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);
-#    if _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_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);
-
-  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
-#    if _LIBCPP_STD_VER >= 26
-  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept {
-    return rdbuf()->native_handle();
-  }
-#    endif
-  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI bool is_open() const;
-  void open(const char* __s, ios_base::openmode __mode = ios_base::out);
-#    if _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_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>(std::addressof(__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>(std::addressof(__sb_)) {
-  if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
-    this->setstate(ios_base::failbit);
-}
-
-#    if _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>(std::addressof(__sb_)) {
-  if (__sb_.open(__s, __mode | ios_base::out) == nullptr)
-    this->setstate(ios_base::failbit);
-}
-#    endif
-
-// extension
-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>(std::addressof(__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(std::addressof(__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>*>(std::addressof(__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);
-}
-
-#    if _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 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);
-#    if _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_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);
-
-  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
-#    if _LIBCPP_STD_VER >= 26
-  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept {
-    return rdbuf()->native_handle();
-  }
-#    endif
-  [[__nodiscard__]] _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);
-#    if _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_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>(std::addressof(__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>(std::addressof(__sb_)) {
-  if (__sb_.open(__s, __mode) == nullptr)
-    this->setstate(ios_base::failbit);
-}
-
-#    if _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>(std::addressof(__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>(std::addressof(__sb_)) {
-  if (__sb_.open(__s, __mode) == nullptr)
-    this->setstate(ios_base::failbit);
-}
-
-// extension
-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(std::addressof(__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>*>(std::addressof(__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);
-}
-
-#    if _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
-
-_LIBCPP_POP_MACROS
-
-#  endif // _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
-
-#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
-#    include <atomic>
-#    include <concepts>
-#    include <cstdlib>
-#    include <iosfwd>
-#    include <limits>
-#    include <mutex>
-#    include <new>
-#    include <stdexcept>
-#    include <type_traits>
-#  endif
-
-#  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 23
-#    include <filesystem>
-#  endif
-#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
-
-#endif // _LIBCPP_FSTREAM