Re: RFC: Non-fragile ivars

[David Chisnall]

On 3 Jun 2008, at 15:41, hns@computer.org wrote:

> "Posing is deprecated in Mac OS X v10.5. The poseAsClass: method is
> not available in 64-bit applications on Mac OS X v10.5."
>
> http://developer.apple.com/releasenotes/Cocoa/RN-ObjectiveC/index.html#/ 
> /apple_ref/doc/uid/TP40004309-DontLinkElementID_10
>
> "All instance variables in 64-bit Objective-C are non-fragile."
>
> But: where do we really need class posing (although I like the
> concept)?

I like class posing, and use it in a few places, so I don't want to  
deprecate or remove it.  I would, however, add a run-time check that  
ensures that every instance variable in the posed class is in the same  
place as the posed class.  I already do this run time checking for  
mixins an traits, so there's no problem adding it for posing.

David