The objection to void* is a style objection. I think if you made the field an int (preferably std::size_t ) then you could name it color instead of data and it would be clear it was intended for graph algorithms. As a std::size_t it would be usable as an index into a vector of arbitrary type to allow complex data to be associated with the graph elements in O[1] time for more complex use cases. That way you preserve the ability to implement graph algorithms directly on the data structure and can update your example without needing to declare your own classes.
This actually sounds pretty good to me. So now we have two possible solutions: 1) removing data field member completely; 2) substitute it with size_t color member. I am satisfied with both solutions (the second one is more flexible as it allows to execute graph algorithms directly). Regards, Andrii _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost