code snippet effectively traverses the Voronoi edges
around the
Voronoi vertex:<br>
      <br>
      <span style="font-family: Courier New,Courier,monospace;">const
voronoi_edge&lt;double&gt;* edge = vertex-&gt;incident_edge();</span><br>
      <span style="font-family: Courier New,Courier,monospace;">do {</span><br
 style="font-family: Courier New,Courier,monospace;">
      <span style="font-family: Courier New,Courier,monospace;">&nbsp;
edge = edge-&gt;next();</span><br
 style="font-family: Courier New,Co