>.
</TD>
</TR>

<TR>
<TD><pre>boost::graph_traits&lt;G&gt;::degree_size_type</pre>
The unsigned intergral type used for representing the number
out-edges or incident edges of a vertex.
</TD>
</TR>

</table>

<h3>Valid Expressions</h3>

<Table border>

<tr>
<td><a name="sec:source"><TT>source(e,&nbsp;g)</TT></a></TD>
<TD>Returns the vertex descriptor for <i>u</i> of the edge <i>(u,v)</i> represented by <TT>e</TT>.<br>
Return type: <TT>vertex_descriptor</TT>
</TD>
</TR>


<tr>
<td><a name="sec:target"><TT>tar