 href="process_group.html">MPI process group</a>.</li>
<li>A selector indicating how the vertex lists in each process will be
stored. Only the <tt class="docutils literal"><span class="pre">vecS</span></tt> and <tt class="docutils literal"><span class="pre">listS</span></tt> selectors are well-supported
at this time.</li>
</ul>
<p>The following <tt class="docutils literal"><span class="pre">typedef</span></tt> defines a distributed adjacency list
containing directed edges. The vertices in the graph will be
