On 14/10/2009, at 6:40 AM, Richard Somers wrote:
The same is true for NSArray, NSSet, and other foundation classes. If the class has no instance variables, what does it do for storage?
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. You can do this yourself - compile the code using the 'real' headers then publish a public header that strips the ivars and only includes any public API you want to expose. It's a good habit to mark ivars as @private unless you really, really cannot avoid doing that, and if they are private there's no need to publish them.
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