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Re: NSString Class Instance Variables

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Re: NSString Class Instance Variables

Subject: Re: NSString Class Instance Variables
From: Jens Alfke <email@hidden>
Date: Tue, 13 Oct 2009 16:35:16 -0700


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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References:  
  >NSString Class Instance Variables (From: Richard Somers <email@hidden>)
  >Re: NSString Class Instance Variables (From: Graham Cox <email@hidden>)




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