 executing process.</p>
<hr class="docutils" />
<pre class="literal-block">
degree_size_type
in_degree(vertex_descriptor u, const adjacency_list&amp; g);
</pre>
<p>Returns the number of edges entering vertex <tt class="docutils literal"><span class="pre">u</span></tt>. This operation is
only available if <tt class="docutils literal"><span class="pre">bidirectionalS</span></tt> was specified for the
<tt class="docutils literal"><span class="pre">Directed</span></tt> template parameter. Vertex <tt class="docu