Re: Exception when using GSDictionary in corebase

[Dr. H. Nikolaus Schaller]

Am 20.05.2011 um 18:03 schrieb Stefan Bidi:

> Earlier today I committed the first set of changes to CFString.  It now uses 
> libicu instead of NSString.  This will allow a lot of extra functionality to 
> work, include any of the functions that use CFLocale.  Anyway, that's just 
> the background.
> 
> In order to make this work, I moved __CFStringMakeConstantString() to 
> CFString.c and changed it to use CFDictionary instead of NSSet (CFSet doesn't 
> yet exist).  When I did that, I started getting an exception whenever trying 
> to add anything to the dictionary (CFString.c:1173).  It took me a while to 
> figure it out, and it is due to GSDictionary setting GSI_MAP_RETAIN_KEY() 
> being set to call -copyWithZone:.  For some reason, whenever that happens I 
> get a NSCFType does not recognize -copyWithZone: exception.
> 
> I don't understand enough about how GSDictionary works, so I was wondering if 
> anyone could help me out here?  Really, I don't even understand why 
> -copyWithZone: is being called since I just need to object retained, not 
> copied.

I think it is because the key of a NSDictionary is always copied to prevent 
e.g. problems when
using a NSMutableString as a key and change its value on the fly...

Why aren't you using a NSArray/CFArray to simulate a NSSet? They are much more 
similar than
dictionaries and sets.

Nikolaus