r>

<pre>
graph_traits&lt;subgraph&gt;::edge_descriptor
</pre>
    The type for the edge descriptors. 
    (Required by <a href="Graph.html">Graph</a>.)

<hr>

<pre>
graph_traits&lt;subgraph&gt;::vertex_iterator
</pre>
    The type for the iterators returned by <tt>vertices</tt>. 
    (Required by <a href="VertexListGraph.html">VertexListGraph</a>.)

<hr>

<pre>
graph_traits&lt;subgraph&gt;::edge_iterator
</pre>
    The type for the iterators returned by <tt>edges</tt>. 
    (Required by <a href="EdgeListGr