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/usr/include/octave-3.8.1/octave/oct-fstrm.h is in liboctave-dev 3.8.1-1ubuntu1.

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/*

Copyright (C) 1996-2013 John W. Eaton

This file is part of Octave.

Octave 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 of the License, or (at your
option) any later version.

Octave 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.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#if !defined (octave_oct_fstrm_h)
#define octave_oct_fstrm_h 1

#include <fstream>
#include <string>

#include "oct-stream.h"

class
octave_fstream : public octave_base_stream
{
public:

  octave_fstream (const std::string& nm_arg,
                  std::ios::openmode arg_md = std::ios::in|std::ios::out,
                  oct_mach_info::float_format flt_fmt
                    = oct_mach_info::native_float_format ());

  static octave_stream
  create (const std::string& nm_arg,
          std::ios::openmode arg_md = std::ios::in|std::ios::out,
          oct_mach_info::float_format flt_fmt
            = oct_mach_info::native_float_format ());

  // Position a stream at OFFSET relative to ORIGIN.

  int seek (off_t offset, int origin);

  // Return current stream position.

  off_t tell (void);

  // Return non-zero if EOF has been reached on this stream.

  bool eof (void) const;

  void do_close (void);

  // The name of the file.

  std::string name (void) const { return nm; }

  std::istream *input_stream (void);

  std::ostream *output_stream (void);

protected:

  ~octave_fstream (void) { }

private:

  std::string nm;

  std::fstream fs;

  // No copying!

  octave_fstream (const octave_fstream&);

  octave_fstream& operator = (const octave_fstream&);
};

#endif