[Openmcl-devel] @metaclass type definition

Paul Krueger plkrueger at comcast.net
Mon Apr 27 09:31:52 PDT 2009

I recently upgraded to: Clozure Common Lisp Version 1.3-r11966M   

I'm trying to run through the NIB loading examples as described in the  
file: ".../ccl/examples/cocoa/nib-loading/HOWTO.html". I did NOT try  
these on any previous release. Part of one of the examples does the  
following while in the ccl package:

? (setf *my-dict* (#/dictionaryWithObject:forKey: (@class ns-mutable- 
dictionary) *my-app* #@"NSNibOwner"))
When I do this I get the following:
 > Error: Unknown type specifier: (@METACLASS "NSMutableDictionary")
 > While executing: %%TYPEP, in process Listener(6).
Investigating further I did:
? (macroexpand-1 '(@class ns-mutable-dictionary))
So clearly the class was found and it's the @METACLASS type assertion  
that is causing the problem (just as the first error message said). I  
just bypassed the type declaration and got the example to work just  
The @class macro seems to be used in several places, so I hunted all  
over to see if I could discover how (@metaclass  ...) should have been  
turned into a valid type specifier, but couldn't find it. The closest  
I came was the function "get-objc-class-from-declaration" which as  
near as I can tell is only called in one place that didn't seem to be  
relevant to all the different ways that @class is used, but maybe I  
missed something there.
Can anyone clarify for me whether the example should have worked as  
written and if so what might be wrong? How does the @class macro  
defined in objc-runtime.lisp ever work?

Thanks, Paul
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