Re: class_respondsToSelector() in runtime.h?
Re: class_respondsToSelector() in runtime.h?
- Subject: Re: class_respondsToSelector() in runtime.h?
- From: Jean-Daniel Dupas <email@hidden>
- Date: Thu, 1 Jul 2010 19:37:36 +0200
Le 1 juil. 2010 à 19:30, Jonathon Kuo a écrit :
>
> On Jul 1, 2010, at 9:49 AM, Kyle Sluder wrote:
>
>> On Jul 1, 2010, at 9:42 AM, Jonathon Kuo <email@hidden> wrote:
>>
>>> On Jul 1, 2010, at 7:56 AM, Matt Neuburg wrote:
>>>
>>>> "Instance methods defined in a root class can be performed both by instances
>>>> and by class objects. Therefore, all class objects have access to the
>>>> instance methods defined in the root class."
>>>
>>> Not that it would generally be USEFUL to do so, since the purpose of an instance is to hold instance variable values; a class object accessing instance variables through an instance method would come up with uninitialized ivar values, no?
>>
>> They are instances of the root class, so they have all the root class instances variables, of which there is precisely one: isa.
>
> Interesting... so what happens at runtime if a class object invokes an instance method that accesses instance variables? Exception? Assertion? Seg fault?
It just works. isa is a valid pointer on the expected type, even for classes.
-- Jean-Daniel
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