Hi,
I think you should use the public method get_property of the
adjacency_list to acces properly the graph property.
See
http://www.boost.org/libs/graph/doc/adjacency_list.htmltemplate <class GraphProperties, class GraphPropertyTag>
typename graph_property<adjacency_list, GraphPropertyTag>::type&
get_property(adjacency_list& g, GraphPropertyTag);
Return the property specified by GraphPropertyTag that is attached to
the graph object g. The graph_property traits class is defined in
boost/graph/adjacency_list.hpp.
Cheers,
~Benoît
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