[BGL] Strange result with internal graph properties

I have the following code in one of my header files: struct vertex_type_t { typedef boost::vertex_property_tag kind; }; enum vtype { ROOT, INNER, LEAF }; typedef boost::property vertex_type; typedef boost::property vertex_index; typedef boost::property vertex_property; typedef boost::adjacency_list tree; Notice the error: The vertex properties are not chained together. Rather, the actual vertex property that is added to the graph points to vertex_type, and the vertex_index /also/ points to the vertex_type! Now the strange thing: I have been running this and using all of the vertex properties, including vertex_index, without any problems, but when I noticed this, and tried setting the last template parameter of vertex_property to vertex_index instead I get segmentation faults. I have no idea why this is. Björn