On Oct 13, 2009, at 4:29 PM, Graham Cox wrote:
Apart from the class cluster answer you already got, the public
headers don't need to include any instance variables even if they
exist in reality.
Only if the class cannot be subclassed.
In the 32-bit runtime, instance variable offsets are determined at
compile time based on the total size of superclass data, so if the
compiler doesn't know all of the superclass instance variables, it'll
generate incorrect code. (The 64-bit runtime doesn't have this
limitation.)
—Jens
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