el_of"></a></span><a class="link" href="polygon_data.html#geometry.reference.adapted.boost_polygon.polygon_data.model_of">Model
            of</a>
          </h6>
<p>
            <a class="link" href="../../concepts/concept_ring.html" title="Ring Concept">Ring Concept</a>
          </p>
<h6>
<a name="geometry.reference.adapted.boost_polygon.polygon_data.h2"></a>
            <span class="phrase"><a name="geometry.reference.adapted.boost_polygon.polygon_data.header"></a></span><a class="link" href="polygon_da