get vertex of edge <i>e</i> in subgraph <i>g</i>.
    (Required by <a href="IncidenceGraph.html">IncidenceGraph</a>.)

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degree_size_type
out_degree(vertex_descriptor u_local, const subgraph&amp; g)
</pre>
    Returns the number of edges leaving vertex <i>u</i> in subgraph <i>g</i>.
    (Required by <a href="IncidenceGraph.html">IncidenceGraph</a>.)

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degree_size_type in_degree(vertex_descriptor u_local, const subgraph&amp; g)
</pre>
    Returns the number of edges entering vertex <i>u</i