ance_t,int,property&lt;vertex_in_degree_t,int&gt; &gt;</TT> and <tt>PropertyTag=vertex_in_degree_t</tt>.</li>
</UL>


<H3>Concept Checking Class</H3>

<PRE>
  template &lt;class Graph, class X, class PropertyTag&gt;
  struct PropertyGraphConcept
  {
    typedef typename property_map&lt;G, PropertyTag&gt;::type Map;
    typedef typename property_map&lt;G, PropertyTag&gt;::const_type const_Map;
    void constraints() {
      BOOST_CONCEPT_ASSERT(( GraphConcept&lt;G&gt; ));
      BOOST_CONCEPT_ASSERT(( ReadWri