ass="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceShipCAD.html">ShipCAD</a> {</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">// forward declarations</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="keyword">class </span>Subdi