span class="emphasis"><em>r</em></span>:
                  </p>
                </td>
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                  <p>
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">cross_track</span><span class="special">(</span><span class="identifier">Strategy</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">s</span><span class="special">)</span></pre>
<p>
                  </p>
 