Re: Keyed archiving and class clusters

[Richard Frith-Macdonald]

On 28 Jun 2010, at 15:15, Thomas Davie wrote:

> Hi all,
> 
> From what I understand, GNUstep's keyed archive format is meant to be 
> compatible with Apple's.  However, I'm hitting an issue and I'm not certain 
> if it's the fault of the archiver, or class clusters.
> 
> Basically, when an NSMutableSet gets encoded, what really gets encoded is 
> it's concrete subclass, GSMutableSet... When I try to decode this in some 
> code using apple's implementation, it chokes, not having a GSMutableSet class 
> to attempt to init.
> 
> Is there any sane way round this, or should I get on with writing my own 
> serialisation methods if I want to send objects back and forth between 
> apple/GNUstep implementations?

It's a bug ... I fixed it in svn trunk.

If you don't want to use trunk,  I expect as a workaround you could add a 
category to NSMutableSet to override -classForCoder to return [NSMutableSet 
class]