metry.reference.concepts.concept_segment.concept_definition"></a></span><a class="link" href="concept_segment.html#geometry.reference.concepts.concept_segment.concept_definition">Concept
          Definition</a>
        </h6>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              there must be a specialization of <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">tag</span