Hi Doug, [...]

...

I intend to write a visitor class which sets a boolean to each edge, and therefore I need the edge as key.

Common ways to do this include using internal properties and maintaining your own edge_index (internal) property so that you can build property maps out of vectors. [...]

I don't know, if I understand correctly? Would I request the edges' index in the callback member function of the visitor and use this as index to a vector? Maybe you can give me an example? I'm pretty new to boost. Thanks Stefan Rauch