
          <td class="paramtype">const set&lt; T &gt; &amp;&#160;</td>
          <td class="paramname"><em>setB</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>extract the diff element (setA - setB). </p>
<dl class="tparams"><dt>Template Parameters</dt><dd>
  <table class="tparams">
    <tr><td class="paramname">T</td><td></td></tr>
  </table>
  </dd>
</dl>
<dl class="params"><dt>Para