;&nbsp;
const coordinate_type&amp; y)</span><span
 style="font-family: Courier New,Courier,monospace;"></span> </td>
            <td>Voronoi vertex constructor. </td>
          </tr>
          <tr>
            <td style="font-family: Courier New,Courier,monospace;">const
point_type&amp; <span style="font-weight: bold;">x</span>() const </td>
            <td>Returns the x-coordinate of the point that represents
the vertex. </td>
          </tr>
          <tr>
            <td style="font-family: Courier New,C