h_traits&lt;G&gt;::traversal_category</tt><br><br>
 This tag type must be convertible to <tt>incidence_graph_tag</tt>.
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<pre>boost::graph_traits&lt;G&gt;::out_edge_iterator</pre>
An out-edge iterator for a vertex <i>v</i> provides access to the
out-edges of the vertex.  As such, the value type of an out-edge
iterator is the edge descriptor type of its graph. An out-edge
iterator must meet the requirements of <a
href="../../utility/MultiPassInputIterator.html">MultiPassInputIterator</a