n the graph <tt class="docutils literal"><span class="pre">g</span></tt> that are stored in the
executing process.</p>
<hr class="docutils" />
<pre class="literal-block">
vertex_descriptor
vertex(vertices_size_type n, const adjacency_list&amp; g);
</pre>
<p>Returns the <tt class="docutils literal"><span class="pre">n``th</span> <span class="pre">vertex</span> <span class="pre">in</span> <span class="pre">the</span> <span class="pre">graph's</span> <span class="pre">vertex</span> <span class="pre">list,</spa