(const adjacency_matrix&amp; g)
</pre>
Returns the number of edges in the graph <tt>g</tt>.<br>
(Required by <a href="EdgeListGraph.html">EdgeListGraph</a>.)

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<pre>
vertex_descriptor vertex(vertices_size_type n, const adjacency_matrix&amp; g)
</pre>
Returns the nth vertex in the graph's vertex list.

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<pre>
std::pair&lt;edge_descriptor, bool&gt;
edge(vertex_descriptor u, vertex_descriptor v,
     const adjacency_matrix&amp; g)
</pre>
Returns the edge connecting vertex <tt>u</tt> to vertex <tt>v</tt