zero).</dd>
    </dl>
    <p>The difference between <strong>file</strong> and <strong>bigfile</strong>
      datastreams are obvious from class name: bigfile one supports large files
      (more than 2Gb) on all supported systems. File one uses streambuf
      interface which is limited to 2Gb on many systems.</p>
    <p>All other class methods are <a href="#datastream_methods">described
        above</a>.<br>
      This class implements all possible methods, including fname() and
      subfile_open().</p>
