"Actors are reference types, but why classes?"

[anandabits (Matthew Johnson)]

@Karl

The problem with using inheritance to bring other data in to your isolation domain is that it doesn’t scale: what if there are 2 actors (usable on their own) that I wish to synchronise with? We don’t support multiple inheritance.

Right, in the current proposal it seems to me like global actors are the way to do this. I think it’s a good concept but wish it was designed in a way that fits into Swift’s type system better.