--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libstdc++-v3/include/std/fstream	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,1083 @@
+// File based streams -*- C++ -*-
+
+// Copyright (C) 1997-2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file include/fstream
+ *  This is a Standard C++ Library header.
+ */
+
+//
+// ISO C++ 14882: 27.8  File-based streams
+//
+
+#ifndef _GLIBCXX_FSTREAM
+#define _GLIBCXX_FSTREAM 1
+
+#pragma GCC system_header
+
+#include <istream>
+#include <ostream>
+#include <bits/codecvt.h>
+#include <cstdio>             // For BUFSIZ
+#include <bits/basic_file.h>  // For __basic_file, __c_lock
+#if __cplusplus >= 201103L
+#include <string>             // For std::string overloads.
+#endif
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // [27.8.1.1] template class basic_filebuf
+  /**
+   *  @brief  The actual work of input and output (for files).
+   *  @ingroup io
+   *
+   *  @tparam _CharT  Type of character stream.
+   *  @tparam _Traits  Traits for character type, defaults to
+   *                   char_traits<_CharT>.
+   *
+   *  This class associates both its input and output sequence with an
+   *  external disk file, and maintains a joint file position for both
+   *  sequences.  Many of its semantics are described in terms of similar
+   *  behavior in the Standard C Library's @c FILE streams.
+   *
+   *  Requirements on traits_type, specific to this class:
+   *  - traits_type::pos_type must be fpos<traits_type::state_type>
+   *  - traits_type::off_type must be streamoff
+   *  - traits_type::state_type must be Assignable and DefaultConstructible,
+   *  - traits_type::state_type() must be the initial state for codecvt.
+   */
+  template<typename _CharT, typename _Traits>
+    class basic_filebuf : public basic_streambuf<_CharT, _Traits>
+    {
+#if __cplusplus >= 201103L
+      template<typename _Tp>
+	using __chk_state = __and_<is_copy_assignable<_Tp>,
+				   is_copy_constructible<_Tp>,
+				   is_default_constructible<_Tp>>;
+
+      static_assert(__chk_state<typename _Traits::state_type>::value,
+		    "state_type must be CopyAssignable, CopyConstructible"
+		    " and DefaultConstructible");
+
+      static_assert(is_same<typename _Traits::pos_type,
+			    fpos<typename _Traits::state_type>>::value,
+		    "pos_type must be fpos<state_type>");
+#endif
+    public:
+      // Types:
+      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 basic_streambuf<char_type, traits_type>  	__streambuf_type;
+      typedef basic_filebuf<char_type, traits_type>     __filebuf_type;
+      typedef __basic_file<char>		        __file_type;
+      typedef typename traits_type::state_type          __state_type;
+      typedef codecvt<char_type, char, __state_type>    __codecvt_type;
+
+      friend class ios_base; // For sync_with_stdio.
+
+    protected:
+      // Data Members:
+      // MT lock inherited from libio or other low-level io library.
+      __c_lock          	_M_lock;
+
+      // External buffer.
+      __file_type 		_M_file;
+
+      /// Place to stash in || out || in | out settings for current filebuf.
+      ios_base::openmode 	_M_mode;
+
+      // Beginning state type for codecvt.
+      __state_type 		_M_state_beg;
+
+      // During output, the state that corresponds to pptr(),
+      // during input, the state that corresponds to egptr() and
+      // _M_ext_next.
+      __state_type		_M_state_cur;
+
+      // Not used for output. During input, the state that corresponds
+      // to eback() and _M_ext_buf.
+      __state_type		_M_state_last;
+
+      /// Pointer to the beginning of internal buffer.
+      char_type*		_M_buf;
+
+      /**
+       *  Actual size of internal buffer. This number is equal to the size
+       *  of the put area + 1 position, reserved for the overflow char of
+       *  a full area.
+       */
+      size_t			_M_buf_size;
+
+      // Set iff _M_buf is allocated memory from _M_allocate_internal_buffer.
+      bool			_M_buf_allocated;
+
+      /**
+       *  _M_reading == false && _M_writing == false for @b uncommitted mode;
+       *  _M_reading == true for @b read mode;
+       *  _M_writing == true for @b write mode;
+       *
+       *  NB: _M_reading == true && _M_writing == true is unused.
+       */
+      bool                      _M_reading;
+      bool                      _M_writing;
+
+      //@{
+      /**
+       *  Necessary bits for putback buffer management.
+       *
+       *  @note pbacks of over one character are not currently supported.
+       */
+      char_type			_M_pback;
+      char_type*		_M_pback_cur_save;
+      char_type*		_M_pback_end_save;
+      bool			_M_pback_init;
+      //@}
+
+      // Cached codecvt facet.
+      const __codecvt_type* 	_M_codecvt;
+
+      /**
+       *  Buffer for external characters. Used for input when
+       *  codecvt::always_noconv() == false. When valid, this corresponds
+       *  to eback().
+       */
+      char*			_M_ext_buf;
+
+      /**
+       *  Size of buffer held by _M_ext_buf.
+       */
+      streamsize		_M_ext_buf_size;
+
+      /**
+       *  Pointers into the buffer held by _M_ext_buf that delimit a
+       *  subsequence of bytes that have been read but not yet converted.
+       *  When valid, _M_ext_next corresponds to egptr().
+       */
+      const char*		_M_ext_next;
+      char*			_M_ext_end;
+
+      /**
+       *  Initializes pback buffers, and moves normal buffers to safety.
+       *  Assumptions:
+       *  _M_in_cur has already been moved back
+       */
+      void
+      _M_create_pback()
+      {
+	if (!_M_pback_init)
+	  {
+	    _M_pback_cur_save = this->gptr();
+	    _M_pback_end_save = this->egptr();
+	    this->setg(&_M_pback, &_M_pback, &_M_pback + 1);
+	    _M_pback_init = true;
+	  }
+      }
+
+      /**
+       *  Deactivates pback buffer contents, and restores normal buffer.
+       *  Assumptions:
+       *  The pback buffer has only moved forward.
+       */
+      void
+      _M_destroy_pback() throw()
+      {
+	if (_M_pback_init)
+	  {
+	    // Length _M_in_cur moved in the pback buffer.
+	    _M_pback_cur_save += this->gptr() != this->eback();
+	    this->setg(_M_buf, _M_pback_cur_save, _M_pback_end_save);
+	    _M_pback_init = false;
+	  }
+      }
+
+    public:
+      // Constructors/destructor:
+      /**
+       *  @brief  Does not open any files.
+       *
+       *  The default constructor initializes the parent class using its
+       *  own default ctor.
+       */
+      basic_filebuf();
+
+#if __cplusplus >= 201103L
+      basic_filebuf(const basic_filebuf&) = delete;
+      basic_filebuf(basic_filebuf&&);
+#endif
+
+      /**
+       *  @brief  The destructor closes the file first.
+       */
+      virtual
+      ~basic_filebuf()
+      { this->close(); }
+
+#if __cplusplus >= 201103L
+      basic_filebuf& operator=(const basic_filebuf&) = delete;
+      basic_filebuf& operator=(basic_filebuf&&);
+      void swap(basic_filebuf&);
+#endif
+
+      // Members:
+      /**
+       *  @brief  Returns true if the external file is open.
+       */
+      bool
+      is_open() const throw()
+      { return _M_file.is_open(); }
+
+      /**
+       *  @brief  Opens an external file.
+       *  @param  __s  The name of the file.
+       *  @param  __mode  The open mode flags.
+       *  @return  @c this on success, NULL on failure
+       *
+       *  If a file is already open, this function immediately fails.
+       *  Otherwise it tries to open the file named @a __s using the flags
+       *  given in @a __mode.
+       *
+       *  Table 92, adapted here, gives the relation between openmode
+       *  combinations and the equivalent @c fopen() flags.
+       *  (NB: lines app, in|out|app, in|app, binary|app, binary|in|out|app,
+       *  and binary|in|app per DR 596)
+       *  <pre>
+       *  +---------------------------------------------------------+
+       *  | ios_base Flag combination            stdio equivalent   |
+       *  |binary  in  out  trunc  app                              |
+       *  +---------------------------------------------------------+
+       *  |             +                        w                  |
+       *  |             +           +            a                  |
+       *  |                         +            a                  |
+       *  |             +     +                  w                  |
+       *  |         +                            r                  |
+       *  |         +   +                        r+                 |
+       *  |         +   +     +                  w+                 |
+       *  |         +   +           +            a+                 |
+       *  |         +               +            a+                 |
+       *  +---------------------------------------------------------+
+       *  |   +         +                        wb                 |
+       *  |   +         +           +            ab                 |
+       *  |   +                     +            ab                 |
+       *  |   +         +     +                  wb                 |
+       *  |   +     +                            rb                 |
+       *  |   +     +   +                        r+b                |
+       *  |   +     +   +     +                  w+b                |
+       *  |   +     +   +           +            a+b                |
+       *  |   +     +               +            a+b                |
+       *  +---------------------------------------------------------+
+       *  </pre>
+       */
+      __filebuf_type*
+      open(const char* __s, ios_base::openmode __mode);
+
+#if __cplusplus >= 201103L
+      /**
+       *  @brief  Opens an external file.
+       *  @param  __s  The name of the file.
+       *  @param  __mode  The open mode flags.
+       *  @return  @c this on success, NULL on failure
+       */
+      __filebuf_type*
+      open(const std::string& __s, ios_base::openmode __mode)
+      { return open(__s.c_str(), __mode); }
+#endif
+
+      /**
+       *  @brief  Closes the currently associated file.
+       *  @return  @c this on success, NULL on failure
+       *
+       *  If no file is currently open, this function immediately fails.
+       *
+       *  If a <em>put buffer area</em> exists, @c overflow(eof) is
+       *  called to flush all the characters.  The file is then
+       *  closed.
+       *
+       *  If any operations fail, this function also fails.
+       */
+      __filebuf_type*
+      close();
+
+    protected:
+      void
+      _M_allocate_internal_buffer();
+
+      void
+      _M_destroy_internal_buffer() throw();
+
+      // [27.8.1.4] overridden virtual functions
+      virtual streamsize
+      showmanyc();
+
+      // Stroustrup, 1998, p. 628
+      // underflow() and uflow() functions are called to get the next
+      // character from the real input source when the buffer is empty.
+      // Buffered input uses underflow()
+
+      virtual int_type
+      underflow();
+
+      virtual int_type
+      pbackfail(int_type __c = _Traits::eof());
+
+      // Stroustrup, 1998, p 648
+      // The overflow() function is called to transfer characters to the
+      // real output destination when the buffer is full. A call to
+      // overflow(c) outputs the contents of the buffer plus the
+      // character c.
+      // 27.5.2.4.5
+      // Consume some sequence of the characters in the pending sequence.
+      virtual int_type
+      overflow(int_type __c = _Traits::eof());
+
+      // Convert internal byte sequence to external, char-based
+      // sequence via codecvt.
+      bool
+      _M_convert_to_external(char_type*, streamsize);
+
+      /**
+       *  @brief  Manipulates the buffer.
+       *  @param  __s  Pointer to a buffer area.
+       *  @param  __n  Size of @a __s.
+       *  @return  @c this
+       *
+       *  If no file has been opened, and both @a __s and @a __n are zero, then
+       *  the stream becomes unbuffered.  Otherwise, @c __s is used as a
+       *  buffer; see
+       *  https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering
+       *  for more.
+       */
+      virtual __streambuf_type*
+      setbuf(char_type* __s, streamsize __n);
+
+      virtual pos_type
+      seekoff(off_type __off, ios_base::seekdir __way,
+	      ios_base::openmode __mode = ios_base::in | ios_base::out);
+
+      virtual pos_type
+      seekpos(pos_type __pos,
+	      ios_base::openmode __mode = ios_base::in | ios_base::out);
+
+      // Common code for seekoff, seekpos, and overflow
+      pos_type
+      _M_seek(off_type __off, ios_base::seekdir __way, __state_type __state);
+
+      int
+      _M_get_ext_pos(__state_type &__state);
+
+      virtual int
+      sync();
+
+      virtual void
+      imbue(const locale& __loc);
+
+      virtual streamsize
+      xsgetn(char_type* __s, streamsize __n);
+
+      virtual streamsize
+      xsputn(const char_type* __s, streamsize __n);
+
+      // Flushes output buffer, then writes unshift sequence.
+      bool
+      _M_terminate_output();
+
+      /**
+       *  This function sets the pointers of the internal buffer, both get
+       *  and put areas. Typically:
+       *
+       *   __off == egptr() - eback() upon underflow/uflow (@b read mode);
+       *   __off == 0 upon overflow (@b write mode);
+       *   __off == -1 upon open, setbuf, seekoff/pos (@b uncommitted mode).
+       *
+       *  NB: epptr() - pbase() == _M_buf_size - 1, since _M_buf_size
+       *  reflects the actual allocated memory and the last cell is reserved
+       *  for the overflow char of a full put area.
+       */
+      void
+      _M_set_buffer(streamsize __off)
+      {
+	const bool __testin = _M_mode & ios_base::in;
+	const bool __testout = (_M_mode & ios_base::out
+				|| _M_mode & ios_base::app);
+
+	if (__testin && __off > 0)
+	  this->setg(_M_buf, _M_buf, _M_buf + __off);
+	else
+	  this->setg(_M_buf, _M_buf, _M_buf);
+
+	if (__testout && __off == 0 && _M_buf_size > 1 )
+	  this->setp(_M_buf, _M_buf + _M_buf_size - 1);
+	else
+	  this->setp(0, 0);
+      }
+    };
+
+  // [27.8.1.5] Template class basic_ifstream
+  /**
+   *  @brief  Controlling input for files.
+   *  @ingroup io
+   *
+   *  @tparam _CharT  Type of character stream.
+   *  @tparam _Traits  Traits for character type, defaults to
+   *                   char_traits<_CharT>.
+   *
+   *  This class supports reading from named files, using the inherited
+   *  functions from std::basic_istream.  To control the associated
+   *  sequence, an instance of std::basic_filebuf is used, which this page
+   *  refers to as @c sb.
+   */
+  template<typename _CharT, typename _Traits>
+    class basic_ifstream : public basic_istream<_CharT, _Traits>
+    {
+    public:
+      // Types:
+      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;
+
+      // Non-standard types:
+      typedef basic_filebuf<char_type, traits_type> 	__filebuf_type;
+      typedef basic_istream<char_type, traits_type>	__istream_type;
+
+    private:
+      __filebuf_type	_M_filebuf;
+
+    public:
+      // Constructors/Destructors:
+      /**
+       *  @brief  Default constructor.
+       *
+       *  Initializes @c sb using its default constructor, and passes
+       *  @c &sb to the base class initializer.  Does not open any files
+       *  (you haven't given it a filename to open).
+       */
+      basic_ifstream() : __istream_type(), _M_filebuf()
+      { this->init(&_M_filebuf); }
+
+      /**
+       *  @brief  Create an input file stream.
+       *  @param  __s  Null terminated string specifying the filename.
+       *  @param  __mode  Open file in specified mode (see std::ios_base).
+       *
+       *  @c ios_base::in is automatically included in @a __mode.
+       *
+       *  Tip:  When using std::string to hold the filename, you must use
+       *  .c_str() before passing it to this constructor.
+       */
+      explicit
+      basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in)
+      : __istream_type(), _M_filebuf()
+      {
+	this->init(&_M_filebuf);
+	this->open(__s, __mode);
+      }
+
+#if __cplusplus >= 201103L
+      /**
+       *  @brief  Create an input file stream.
+       *  @param  __s  std::string specifying the filename.
+       *  @param  __mode  Open file in specified mode (see std::ios_base).
+       *
+       *  @c ios_base::in is automatically included in @a __mode.
+       */
+      explicit
+      basic_ifstream(const std::string& __s,
+		     ios_base::openmode __mode = ios_base::in)
+      : __istream_type(), _M_filebuf()
+      {
+	this->init(&_M_filebuf);
+	this->open(__s, __mode);
+      }
+
+      basic_ifstream(const basic_ifstream&) = delete;
+
+      basic_ifstream(basic_ifstream&& __rhs)
+      : __istream_type(std::move(__rhs)),
+      _M_filebuf(std::move(__rhs._M_filebuf))
+      { __istream_type::set_rdbuf(&_M_filebuf); }
+#endif
+
+      /**
+       *  @brief  The destructor does nothing.
+       *
+       *  The file is closed by the filebuf object, not the formatting
+       *  stream.
+       */
+      ~basic_ifstream()
+      { }
+
+#if __cplusplus >= 201103L
+      // 27.8.3.2 Assign and swap:
+
+      basic_ifstream&
+      operator=(const basic_ifstream&) = delete;
+
+      basic_ifstream&
+      operator=(basic_ifstream&& __rhs)
+      {
+	__istream_type::operator=(std::move(__rhs));
+	_M_filebuf = std::move(__rhs._M_filebuf);
+	return *this;
+      }
+
+      void
+      swap(basic_ifstream& __rhs)
+      {
+	__istream_type::swap(__rhs);
+	_M_filebuf.swap(__rhs._M_filebuf);
+      }
+#endif
+
+      // Members:
+      /**
+       *  @brief  Accessing the underlying buffer.
+       *  @return  The current basic_filebuf buffer.
+       *
+       *  This hides both signatures of std::basic_ios::rdbuf().
+       */
+      __filebuf_type*
+      rdbuf() const
+      { return const_cast<__filebuf_type*>(&_M_filebuf); }
+
+      /**
+       *  @brief  Wrapper to test for an open file.
+       *  @return  @c rdbuf()->is_open()
+       */
+      bool
+      is_open()
+      { return _M_filebuf.is_open(); }
+
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 365. Lack of const-qualification in clause 27
+      bool
+      is_open() const
+      { return _M_filebuf.is_open(); }
+
+      /**
+       *  @brief  Opens an external file.
+       *  @param  __s  The name of the file.
+       *  @param  __mode  The open mode flags.
+       *
+       *  Calls @c std::basic_filebuf::open(s,__mode|in).  If that function
+       *  fails, @c failbit is set in the stream's error state.
+       *
+       *  Tip:  When using std::string to hold the filename, you must use
+       *  .c_str() before passing it to this constructor.
+       */
+      void
+      open(const char* __s, ios_base::openmode __mode = ios_base::in)
+      {
+	if (!_M_filebuf.open(__s, __mode | ios_base::in))
+	  this->setstate(ios_base::failbit);
+	else
+	  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+	  // 409. Closing an fstream should clear error state
+	  this->clear();
+      }
+
+#if __cplusplus >= 201103L
+      /**
+       *  @brief  Opens an external file.
+       *  @param  __s  The name of the file.
+       *  @param  __mode  The open mode flags.
+       *
+       *  Calls @c std::basic_filebuf::open(__s,__mode|in).  If that function
+       *  fails, @c failbit is set in the stream's error state.
+       */
+      void
+      open(const std::string& __s, ios_base::openmode __mode = ios_base::in)
+      {
+	if (!_M_filebuf.open(__s, __mode | ios_base::in))
+	  this->setstate(ios_base::failbit);
+	else
+	  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+	  // 409. Closing an fstream should clear error state
+	  this->clear();
+      }
+#endif
+
+      /**
+       *  @brief  Close the file.
+       *
+       *  Calls @c std::basic_filebuf::close().  If that function
+       *  fails, @c failbit is set in the stream's error state.
+       */
+      void
+      close()
+      {
+	if (!_M_filebuf.close())
+	  this->setstate(ios_base::failbit);
+      }
+    };
+
+
+  // [27.8.1.8] Template class basic_ofstream
+  /**
+   *  @brief  Controlling output for files.
+   *  @ingroup io
+   *
+   *  @tparam _CharT  Type of character stream.
+   *  @tparam _Traits  Traits for character type, defaults to
+   *                   char_traits<_CharT>.
+   *
+   *  This class supports reading from named files, using the inherited
+   *  functions from std::basic_ostream.  To control the associated
+   *  sequence, an instance of std::basic_filebuf is used, which this page
+   *  refers to as @c sb.
+   */
+  template<typename _CharT, typename _Traits>
+    class basic_ofstream : public basic_ostream<_CharT,_Traits>
+    {
+    public:
+      // Types:
+      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;
+
+      // Non-standard types:
+      typedef basic_filebuf<char_type, traits_type> 	__filebuf_type;
+      typedef basic_ostream<char_type, traits_type>	__ostream_type;
+
+    private:
+      __filebuf_type	_M_filebuf;
+
+    public:
+      // Constructors:
+      /**
+       *  @brief  Default constructor.
+       *
+       *  Initializes @c sb using its default constructor, and passes
+       *  @c &sb to the base class initializer.  Does not open any files
+       *  (you haven't given it a filename to open).
+       */
+      basic_ofstream(): __ostream_type(), _M_filebuf()
+      { this->init(&_M_filebuf); }
+
+      /**
+       *  @brief  Create an output file stream.
+       *  @param  __s  Null terminated string specifying the filename.
+       *  @param  __mode  Open file in specified mode (see std::ios_base).
+       *
+       *  @c ios_base::out | @c ios_base::trunc is automatically included in
+       *  @a __mode.
+       *
+       *  Tip:  When using std::string to hold the filename, you must use
+       *  .c_str() before passing it to this constructor.
+       */
+      explicit
+      basic_ofstream(const char* __s,
+		     ios_base::openmode __mode = ios_base::out|ios_base::trunc)
+      : __ostream_type(), _M_filebuf()
+      {
+	this->init(&_M_filebuf);
+	this->open(__s, __mode);
+      }
+
+#if __cplusplus >= 201103L
+      /**
+       *  @brief  Create an output file stream.
+       *  @param  __s  std::string specifying the filename.
+       *  @param  __mode  Open file in specified mode (see std::ios_base).
+       *
+       *  @c ios_base::out | @c ios_base::trunc is automatically included in
+       *  @a __mode.
+       */
+      explicit
+      basic_ofstream(const std::string& __s,
+		     ios_base::openmode __mode = ios_base::out|ios_base::trunc)
+      : __ostream_type(), _M_filebuf()
+      {
+	this->init(&_M_filebuf);
+	this->open(__s, __mode);
+      }
+
+      basic_ofstream(const basic_ofstream&) = delete;
+
+      basic_ofstream(basic_ofstream&& __rhs)
+      : __ostream_type(std::move(__rhs)),
+      _M_filebuf(std::move(__rhs._M_filebuf))
+      { __ostream_type::set_rdbuf(&_M_filebuf); }
+#endif
+
+      /**
+       *  @brief  The destructor does nothing.
+       *
+       *  The file is closed by the filebuf object, not the formatting
+       *  stream.
+       */
+      ~basic_ofstream()
+      { }
+
+#if __cplusplus >= 201103L
+      // 27.8.3.2 Assign and swap:
+
+      basic_ofstream&
+      operator=(const basic_ofstream&) = delete;
+
+      basic_ofstream&
+      operator=(basic_ofstream&& __rhs)
+      {
+	__ostream_type::operator=(std::move(__rhs));
+	_M_filebuf = std::move(__rhs._M_filebuf);
+	return *this;
+      }
+
+      void
+      swap(basic_ofstream& __rhs)
+      {
+	__ostream_type::swap(__rhs);
+	_M_filebuf.swap(__rhs._M_filebuf);
+      }
+#endif
+
+      // Members:
+      /**
+       *  @brief  Accessing the underlying buffer.
+       *  @return  The current basic_filebuf buffer.
+       *
+       *  This hides both signatures of std::basic_ios::rdbuf().
+       */
+      __filebuf_type*
+      rdbuf() const
+      { return const_cast<__filebuf_type*>(&_M_filebuf); }
+
+      /**
+       *  @brief  Wrapper to test for an open file.
+       *  @return  @c rdbuf()->is_open()
+       */
+      bool
+      is_open()
+      { return _M_filebuf.is_open(); }
+
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 365. Lack of const-qualification in clause 27
+      bool
+      is_open() const
+      { return _M_filebuf.is_open(); }
+
+      /**
+       *  @brief  Opens an external file.
+       *  @param  __s  The name of the file.
+       *  @param  __mode  The open mode flags.
+       *
+       *  Calls @c std::basic_filebuf::open(__s,__mode|out|trunc).  If that
+       *  function fails, @c failbit is set in the stream's error state.
+       *
+       *  Tip:  When using std::string to hold the filename, you must use
+       *  .c_str() before passing it to this constructor.
+       */
+      void
+      open(const char* __s,
+	   ios_base::openmode __mode = ios_base::out | ios_base::trunc)
+      {
+	if (!_M_filebuf.open(__s, __mode | ios_base::out))
+	  this->setstate(ios_base::failbit);
+	else
+	  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+	  // 409. Closing an fstream should clear error state
+	  this->clear();
+      }
+
+#if __cplusplus >= 201103L
+      /**
+       *  @brief  Opens an external file.
+       *  @param  __s  The name of the file.
+       *  @param  __mode  The open mode flags.
+       *
+       *  Calls @c std::basic_filebuf::open(s,mode|out|trunc).  If that
+       *  function fails, @c failbit is set in the stream's error state.
+       */
+      void
+      open(const std::string& __s,
+	   ios_base::openmode __mode = ios_base::out | ios_base::trunc)
+      {
+	if (!_M_filebuf.open(__s, __mode | ios_base::out))
+	  this->setstate(ios_base::failbit);
+	else
+	  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+	  // 409. Closing an fstream should clear error state
+	  this->clear();
+      }
+#endif
+
+      /**
+       *  @brief  Close the file.
+       *
+       *  Calls @c std::basic_filebuf::close().  If that function
+       *  fails, @c failbit is set in the stream's error state.
+       */
+      void
+      close()
+      {
+	if (!_M_filebuf.close())
+	  this->setstate(ios_base::failbit);
+      }
+    };
+
+
+  // [27.8.1.11] Template class basic_fstream
+  /**
+   *  @brief  Controlling input and output for files.
+   *  @ingroup io
+   *
+   *  @tparam _CharT  Type of character stream.
+   *  @tparam _Traits  Traits for character type, defaults to
+   *                   char_traits<_CharT>.
+   *
+   *  This class supports reading from and writing to named files, using
+   *  the inherited functions from std::basic_iostream.  To control the
+   *  associated sequence, an instance of std::basic_filebuf is used, which
+   *  this page refers to as @c sb.
+   */
+  template<typename _CharT, typename _Traits>
+    class basic_fstream : public basic_iostream<_CharT, _Traits>
+    {
+    public:
+      // Types:
+      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;
+
+      // Non-standard types:
+      typedef basic_filebuf<char_type, traits_type> 	__filebuf_type;
+      typedef basic_ios<char_type, traits_type>		__ios_type;
+      typedef basic_iostream<char_type, traits_type>	__iostream_type;
+
+    private:
+      __filebuf_type	_M_filebuf;
+
+    public:
+      // Constructors/destructor:
+      /**
+       *  @brief  Default constructor.
+       *
+       *  Initializes @c sb using its default constructor, and passes
+       *  @c &sb to the base class initializer.  Does not open any files
+       *  (you haven't given it a filename to open).
+       */
+      basic_fstream()
+      : __iostream_type(), _M_filebuf()
+      { this->init(&_M_filebuf); }
+
+      /**
+       *  @brief  Create an input/output file stream.
+       *  @param  __s  Null terminated string specifying the filename.
+       *  @param  __mode  Open file in specified mode (see std::ios_base).
+       *
+       *  Tip:  When using std::string to hold the filename, you must use
+       *  .c_str() before passing it to this constructor.
+       */
+      explicit
+      basic_fstream(const char* __s,
+		    ios_base::openmode __mode = ios_base::in | ios_base::out)
+      : __iostream_type(0), _M_filebuf()
+      {
+	this->init(&_M_filebuf);
+	this->open(__s, __mode);
+      }
+
+#if __cplusplus >= 201103L
+      /**
+       *  @brief  Create an input/output file stream.
+       *  @param  __s  Null terminated string specifying the filename.
+       *  @param  __mode  Open file in specified mode (see std::ios_base).
+       */
+      explicit
+      basic_fstream(const std::string& __s,
+		    ios_base::openmode __mode = ios_base::in | ios_base::out)
+      : __iostream_type(0), _M_filebuf()
+      {
+	this->init(&_M_filebuf);
+	this->open(__s, __mode);
+      }
+
+      basic_fstream(const basic_fstream&) = delete;
+
+      basic_fstream(basic_fstream&& __rhs)
+      : __iostream_type(std::move(__rhs)),
+      _M_filebuf(std::move(__rhs._M_filebuf))
+      { __iostream_type::set_rdbuf(&_M_filebuf); }
+#endif
+
+      /**
+       *  @brief  The destructor does nothing.
+       *
+       *  The file is closed by the filebuf object, not the formatting
+       *  stream.
+       */
+      ~basic_fstream()
+      { }
+
+#if __cplusplus >= 201103L
+      // 27.8.3.2 Assign and swap:
+
+      basic_fstream&
+      operator=(const basic_fstream&) = delete;
+
+      basic_fstream&
+      operator=(basic_fstream&& __rhs)
+      {
+	__iostream_type::operator=(std::move(__rhs));
+	_M_filebuf = std::move(__rhs._M_filebuf);
+	return *this;
+      }
+
+      void
+      swap(basic_fstream& __rhs)
+      {
+	__iostream_type::swap(__rhs);
+	_M_filebuf.swap(__rhs._M_filebuf);
+      }
+#endif
+
+      // Members:
+      /**
+       *  @brief  Accessing the underlying buffer.
+       *  @return  The current basic_filebuf buffer.
+       *
+       *  This hides both signatures of std::basic_ios::rdbuf().
+       */
+      __filebuf_type*
+      rdbuf() const
+      { return const_cast<__filebuf_type*>(&_M_filebuf); }
+
+      /**
+       *  @brief  Wrapper to test for an open file.
+       *  @return  @c rdbuf()->is_open()
+       */
+      bool
+      is_open()
+      { return _M_filebuf.is_open(); }
+
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 365. Lack of const-qualification in clause 27
+      bool
+      is_open() const
+      { return _M_filebuf.is_open(); }
+
+      /**
+       *  @brief  Opens an external file.
+       *  @param  __s  The name of the file.
+       *  @param  __mode  The open mode flags.
+       *
+       *  Calls @c std::basic_filebuf::open(__s,__mode).  If that
+       *  function fails, @c failbit is set in the stream's error state.
+       *
+       *  Tip:  When using std::string to hold the filename, you must use
+       *  .c_str() before passing it to this constructor.
+       */
+      void
+      open(const char* __s,
+	   ios_base::openmode __mode = ios_base::in | ios_base::out)
+      {
+	if (!_M_filebuf.open(__s, __mode))
+	  this->setstate(ios_base::failbit);
+	else
+	  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+	  // 409. Closing an fstream should clear error state
+	  this->clear();
+      }
+
+#if __cplusplus >= 201103L
+      /**
+       *  @brief  Opens an external file.
+       *  @param  __s  The name of the file.
+       *  @param  __mode  The open mode flags.
+       *
+       *  Calls @c std::basic_filebuf::open(__s,__mode).  If that
+       *  function fails, @c failbit is set in the stream's error state.
+       */
+      void
+      open(const std::string& __s,
+	   ios_base::openmode __mode = ios_base::in | ios_base::out)
+      {
+	if (!_M_filebuf.open(__s, __mode))
+	  this->setstate(ios_base::failbit);
+	else
+	  // _GLIBCXX_RESOLVE_LIB_DEFECTS
+	  // 409. Closing an fstream should clear error state
+	  this->clear();
+      }
+#endif
+
+      /**
+       *  @brief  Close the file.
+       *
+       *  Calls @c std::basic_filebuf::close().  If that function
+       *  fails, @c failbit is set in the stream's error state.
+       */
+      void
+      close()
+      {
+	if (!_M_filebuf.close())
+	  this->setstate(ios_base::failbit);
+      }
+    };
+
+#if __cplusplus >= 201103L
+  /// Swap specialization for filebufs.
+  template <class _CharT, class _Traits>
+    inline void
+    swap(basic_filebuf<_CharT, _Traits>& __x,
+	 basic_filebuf<_CharT, _Traits>& __y)
+    { __x.swap(__y); }
+
+  /// Swap specialization for ifstreams.
+  template <class _CharT, class _Traits>
+    inline void
+    swap(basic_ifstream<_CharT, _Traits>& __x,
+	 basic_ifstream<_CharT, _Traits>& __y)
+    { __x.swap(__y); }
+
+  /// Swap specialization for ofstreams.
+  template <class _CharT, class _Traits>
+    inline void
+    swap(basic_ofstream<_CharT, _Traits>& __x,
+	 basic_ofstream<_CharT, _Traits>& __y)
+    { __x.swap(__y); }
+
+  /// Swap specialization for fstreams.
+  template <class _CharT, class _Traits>
+    inline void
+    swap(basic_fstream<_CharT, _Traits>& __x,
+	 basic_fstream<_CharT, _Traits>& __y)
+    { __x.swap(__y); }
+#endif
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#include <bits/fstream.tcc>
+
+#endif /* _GLIBCXX_FSTREAM */