Help on subclassing
Help on subclassing
- Subject: Help on subclassing
- From: Joachim <email@hidden>
- Date: Wed, 30 Nov 2005 15:09:19 -0800
Esteemed experts,
I'm working with 2 classes, B and C, that are quite similar to each
other. One of them is a preview of the other. They both inherit from
their superclass, A, that will never be instantiated (like an
abstract class). All functionality that is the same for both B and C
is of course placed in A, and the methods that differ are put in the
respective B and C subclasses.
From within the generic code (in the A class), I'd like to call code
that's declared and will be run in the respective B and C subclasses.
That is, from within A I'd like to call [self someMethod], where
someMethod only exists in B and C - not in A. How do I do this?
In my attempts, the compiler warns that A may not respond to
someMethod which is fine, because I know it will at runtime. And it
works as expected at runtime. But if someMethod returns a value, the
compiler throws an error:
NSRect myRect = [self someMethod];
-> error: invalid initializer
(or
NSRect myRect;
myRect = [self someMethod];
-> error: incompatible types in assignment)
My workaround is to declare the method in A where I just return a
"dummy" value, because it's never used anyway. But it's not very nice
to look at and shouldn't be necessary. Any solution to this?
Thanks you for your help,
Joachim
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