&quot;,</td>
</tr><tr><td></td>      <td class=PType nowrap>int&nbsp;</td>
      <td class=PParameter nowrap>threshold</td>
      <td class=PDefaultValuePrefix>&nbsp;=&nbsp;</td>
      <td class=PDefaultValue width=100%>0</td>
      <td class=PAfterParameters nowrap>)</td></tr>
      </table></td></tr>
    </table></blockquote>
Creates a new barrier object.</div></div><div class=CToolTip id="tt5"><div class=CMethod>
    <blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>virtual 