_stream&quot;</td>
    </tr>
    <tr>
      <td class=PAfterParameters colspan=5>)</td></tr>
      </table></td></tr>
    </table></blockquote>
Constructor</div></div><div class=CToolTip id="tt4"><div class=CMethod>
    <blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype>
      <tr><td><table border=0 cellspacing=0 cellpadding=0><tr>
      <td class=PBeforeParameters colspan=3>protected virtual function void do_open(</td>      </tr><tr><td>&nbsp;&nbsp;&nbsp;</td>      <td class=PType now