On Sep 5, 2008, at 4:52 , Michael Ash wrote:
But at run time they are the same type. If you disagree, just create an NSArray and a CFArray (with the standard CFType callbacks) and try to tell the difference between them!
This is true for NSArray, because it will create an NSCFArray under the hood which is a CFArray. However, it is not true for the case of a functional NSArray subclass, which will not be a CFArray underneath. CFArray functions will continue to work because they fall back to sending messages to the object in question when it's not a CF- object, but telling the difference is fairly easy if you want to do it.
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