he iterators returned by <tt>vertices()</tt>.
  The vertex iterator models <a href="http://www.boost.org/sgi/stl/RandomAccessIterator.html">RandomAccessIterator</a>. <br>
 (Required by <a href="VertexListGraph.html">VertexListGraph</a>.)

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<tt>graph_traits&lt;adjacency_matrix&gt;::edge_iterator</tt>
<br><br>
  The type for the iterators returned by <tt>edges()</tt>. This
  iterator models <a href="../../utility/MultiPassInputIterator.html">MultiPassInputIterator</a>.<br>
 (Required by <a href="EdgeListG