On 4 Mar 2014, at 9:20 pm, William Squires <wsqui...@satx.rr.com> wrote:
> Question: Do I have to list the @property line in CSquare.h in order for > users of CSquare to be able to access the "area" property? Or is it > sufficient that (because I'm overriding it, and it has the same method > signature - i.e. selector) the superclass CParallelogram has already declared > it? No, you don't have to list it. It's inherited from the super class. > 2nd Question: If I stick CParallelogram instances (well, references, really), > or subclasses thereof into a collection object (NSArray, NSDictionary, > etc...) and I later iterate over them, asking for their areas, will I get the > correct polymorphic behavior (i.e. the selector mechanism will correctly > point to the subclass instance and send the "area" message there), or do I > have to pull the reference out of the collection, test and typecast it, then > call for its area? No, there is no need to do anything special. If you iterate on "area" it will invoke the -area method of each object, so it will work as you want. @property is just syntactic sugar for standard getter and setter methods, so you can rely on method calls being used to return the property of interest. --Graham _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
