.html">BidirectionalGraph</a>.)

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<pre>
degree_size_type
in_degree(vertex_descriptor u, const adjacency_matrix&amp; g)
</pre>
Returns the number of edges entering vertex <tt>u</tt>.<br>
(Required by <a href="BidirectionalGraph.html">BidirectionalGraph</a>.)
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<pre>
vertices_size_type num_vertices(const adjacency_matrix&amp; g)
</pre>
Returns the number of vertices in the graph <tt>g</tt>.<br>
(Required by <a href="VertexListGraph.html">VertexListGraph</a>.)

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<pre>
edges_size_type num_edges