ecessorMap</tt> type
  must be a <a
  href="../../property_map/ReadWritePropertyMap.html">Read/Write
  Property Map</a> which key and vertex types the same as the vertex
  descriptor type of the graph.<br>
  <b>Default:</b> <tt>dummy_property_map</tt>
</blockquote>

UTIL/OUT: <tt>distance_map(DistanceMap d_map)</tt> 
<blockquote>
  The shortest path weight from the source vertex <tt>s</tt> to each
  vertex in the graph <tt>g</tt> is recorded in this property map. The
  shortest path weight is the sum of the