To do what you want, you can use [MySuperClass
instancesRespondToSelector:aSelector]. Note, you have to name the
specific class you want to check. You can't use [self superclass]
because that's dynamic -- the result from that may actually be
deeper in the class hierarchy than the code you're writing.
I was reminded by some googling that a better thing to do, rather
than naming your superclass explicitly ("MySuperClass" in my example)
is to name your own class explicitly and use the +superclass method
to find the superclass:
