tributed Graph</a> concept. It also models the
<a class="reference external" href="http://www.boost.org/libs/graph/doc/IncidenceGraph.html">Incidence Graph</a> and <a class="reference external" href="http://www.boost.org/libs/graph/doc/AdjacencyGraph.html">Adjacency Graph</a> concept, but restricts the
input domain of the operations to correspond to local vertices
only. For instance, a process may only access the outgoing edges of a
vertex if that vertex is stored in that process. Undirected and
bidirection