[boost] enumeration interface for boost::signals

Does boost::signals have a public enumeration interface (like iterator concept) that can be used for accessing individual slots? There is some mention of it in the "Slot Call Iterator" section but not much detailed. For instance, what I'd like is to call a slot and depending on the result call some other slot. A related question is if I have an instance of boost::signals::connection, is it possible to get an access to the slot that this connection is referencing? Thanks, Eugene