On May 31, 2008, at 2:43 AM, j o a r wrote:
On May 31, 2008, at 12:23 AM, Michael Ash wrote:
Assume the following class hierarchy:
A <- B <- C <- D <- E
In the implementation of B, you write [self superclass]. Now your
method executes with self set to an instance of E. What do you get?
I would propose that you should re-examine your design if you find
that to be a problem in practice:
<http://en.wikipedia.org/wiki/Code_smell>
Using [self superclass] is wrong. The hierarchy with five levels may
or may not be a problem, but [self superclass] is still wrong even in
a hierarchy with 3 levels (even if "A" is NSObject, as is typical).
If your class may be subclassed, then [[self superclass]
instancesRespondToSelector:aSelector] may blow up in your face.
-Ken
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