There is a command for doing this (implement-protos <class_name>). It is not super-refined, but it works adequately nevertheless. Run it from the SlickEdit command line and give the it the name of the class you are implementing.
There is also a command that does the inverse, generates prototypes for the functions found in the current file. Again not super-refined, you might need to cut and paste and massage the results a bit, but it is easier than typing it all by hand.
