operty_map</TT>. The following code shows how one can obtain the
property map for the distance and weight properties of some graph
type.

<P>
<PRE>
  property_map&lt;Graph, vertex_distance_t&gt;::type d
    = get(vertex_distance, g);

  property_map&lt;Graph, edge_weight_t&gt;::type w
    = get(edge_weight, g);
</PRE>

<P>
In general, the BGL algorithms require all property maps needed
by the algorithm to be explicitly passed to the algorithm. For
example, the BGL Dijkstra's shortest paths algorithm require