ine"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment"></span>    <span class="keyword">using</span> LinePair = std::pair&lt;CPoint, CPoint&gt;;</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    <span class="keyword">using</span> LineList = std::vector&lt;LinePair&gt;;</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    <span class="keyword">using</span> PointList = std::vector&lt;CPoint&gt;;</div><div cl