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Casting objects in NSCountedSet
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Casting objects in NSCountedSet


  • Subject: Casting objects in NSCountedSet
  • From: Koen van der Drift <email@hidden>
  • Date: Tue, 24 Sep 2013 11:38:50 -0400

In my app I am using a 3rd party framework, and I have subclassed (objB) one of the classes (objA) for additional functionality.

At one point I am getting an NSCountedSet from the framework with objects objA.  When I enumerate these, I'd like to cast them as objB, to access the additional functionality (doSomethingNew).  But whatever I try, the objects are always casted as objA.

 NSCountedSet *cs = [framework countSymbols];

        for (objB *obj in cs)
        {
            NSDictionary *ec = [objB doSomethingNew];  <<== throws error, because objA doesn't know about doSomethingNew

	//	etc
	}


or:

 NSCountedSet *cs = [framework countSymbols];

        for (id *obj in cs)
        {
            NSDictionary *ec = [((ObjB*) obj) doSomethingNew];  <<== throws error, because objA doesn't know about doSomethingNew

	//	etc
	}


Is it possible what I am trying to do?

- Koen.
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