Re: runtime and type encoding confusion on 64-bit

On Sep 5, 2009, at 19:34, Graham Lee wrote:

> On Sep 5, 2009, at 17:41 , Shantonu Sen wrote:
>
>> Did you look at the prototype?
>>
>> OBJC_EXPORT Ivar object_getInstanceVariable(id obj, const char  
>> *name, void **outValue);
>
> The documentation is wrong in that respect. This has been discussed  
> often, examples:
>
> http://stackoverflow.com/questions/1219081/objectgetinstancevariable-works-for-float-int-bool-but-not-for-double
> http://lists.apple.com/archives/Objc-language/2008/Nov/msg00027.html
> http://www.cocoabuilder.com/archive/message/cocoa/2003/12/3/80620
>
> Cheers,
> Graham.

Now that's really confusing. Does that mean that  
object_getInstanceVariable actually can be used only for ivars that  
are pointer-size? Is using ivar_getOffset the only way to get a non- 
object ivar? That is also a bit dangerous because it assumes I  
actually know the type of the ivar (which I already indicated is  
wrong, so I expect it to be changed in a future release).

Anyway, thanks for the pointers.

Christiaan