wn to one, and the queue is no longer needed, it is cleared,
                  freeing up memory. The queue can also be forcibly cleared by calling
                  <code class="computeroutput"><span class="identifier">multi_pass</span><span class="special">::</span><span class="identifier">clear_queue</span><span class="special">()</span></code>.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">fixed_size_q