~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">cross_track</span><span class="special">(</span><span class="identifier">return_type</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">r</span><span class="special">)</span></pre>
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                    <span class="bold"><strong>return_type const &amp;</strong></span>: <