Question

I am sorry if this is a duplicate or too elementary, but how do I make a singleton class that can be subclassed?

Answer 1

Steve Yegge has an amusing article about singletons that mentions subclassing in this quote:

Then there’s the subclassing thing.
It’s almost impossible to subclass a
Singleton, and if you manage it, then
you shouldn’t have been using a
Singleton in the first place. You
don’t even want to go there. I’ve
walked roads that I dare not recount.
Just pretend you can’t do it, and
you’ll save yourself amazing amounts
of pain.