Creating a class cluster
Creating a class cluster
- Subject: Creating a class cluster
- From: David Newberry <email@hidden>
- Date: Fri, 26 Jul 2002 16:57:40 -0700
Hello all,
I would like to create a class cluster. I have looked at the documentation,
but I'm still confused. Since I'm creating the whole cluster (not basing
it off anything else), I create the "abstract superclass" as well as its
subclasses. It's creating the abstract superclass that's my problem right
now (I think). I've created a class to base the subclasses in the cluster
off, but I don't think it's "abstract." If it was abstract I assume that I
wouldn't have to have any code for it -- I'd assume that all it really
needs is a header file. But whatever I'm doing wrong, that's not the case
-- it complains if I don't provide the implementation.
The other thing I'm not sure about it creating instances of the class.
Consider my public class "DNClass" and its subclasses "DNSubClassOne" and
"DNSubClassTwo". If I wasn't using a class cluster, I'd use code something
like this to create new instances:
DNClass *var = [[DNClass alloc] initWithString:@"text"];
With a class cluster, though, initWithString: would be defined by one of
DNClass' subclasses. Since the subclasses will have different member
variables, it seems unlikely that I should be able to do this. Is it
correct that I'd have to embed a alloc...: method in each subclass, or is
the above code still legal with a class cluster?
Thanks,
-David Newberry
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