On Feb 16, 2013, at 2:18 AM, Uli Kusterer <witness.of.teacht...@gmx.net> wrote:
> If ClassA and RootA as well are actually identical, you could probably also
> use instancetype. (good summary here: http://nshipster.com/instancetype/)
instancetype is a good solution when applicable.
Another solution is to lie a little bit to the compiler. In this case, you
don't care with method signature the compiler uses at the call site, because
both -rootObject declarations are compatible with each other as long as you
don't care about strict type checking. It's not like one method returns an
object and the other returns a completely incompatible type like float.
You can tell the compiler which one to pick by casting the receiver to a more
specific type than id:
id someRoot = [ (ClassA *)someObject rootObject ];
// force the compiler to use the declaration for -[ClassA rootObject]
--
Greg Parker gpar...@apple.com Runtime Wrangler
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