[Boost-users] BGL: filtered graph question

Hello everybody! I use the filtered_graph framework to restrict a BFS visit to a small region on my graph. BUT, I provide the starting vertex to the BFS routine by a vertice_descriptor of the underlying/unfiltered graph. Of course, this vertice descriptor matches the predicate. My code compiles fine, but I started to ask myself if this actually behaves correct? As I could not find a hint within the docs, does someone know? Greetings, Sebastian