aph.html">EdgeListGraph</a>.)

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

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<pre>
graph_traits&lt;subgraph&gt;::in_edge_iterator
</pre>
    The <tt>in_edge_iterator</tt> is the
    iterator type returned by the <tt>in_edges</tt> function. 
    (Required by <a href="BidirectionalGraph.html">BidirectionalGraph</a>.)

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<pre>
graph_traits&lt;subgraph&