Re: subclass overwriting superclass ivar
Re: subclass overwriting superclass ivar
- Subject: Re: subclass overwriting superclass ivar
- From: Graham Cox <email@hidden>
- Date: Wed, 26 May 2010 22:53:36 +1000
On 26/05/2010, at 10:41 PM, vincent habchi wrote:
> Hmmm... Let's say you have a class A with a private variable "priv" and b a pointer to a subclass of A. Is:
>
> [(A *)b priv]
>
> legal?
No. It's not legal syntax for accessing an ivar in any case - square brackets invoke a method:- [instance method]. Obj-C does not have the concept of private/public/protected methods, unlike C++.
Perhaps you could ask is:
(A*)b->priv legal?
Depends. If priv is @private it is invisible to code other than within the methods of class A itself, so if this code lived inside such a method it would work, otherwise it would not. I don't think the cast makes any difference.
But this is not getting to the problem that the OP is having, which AFAICS is unrelated to @private. @private is a Good Thing™ - often worth using.
--Graham
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