[racket] FFI callback object pointer

From: gabor papp (gabor.lists at mndl.hu)
Date: Sat Jul 17 11:48:55 EDT 2010

>> I think you should consider encapsulating the type of values that can
>> be passed around and the box to store them in the closure of the
Thank you Thomas and Matthew for your suggestion. It works great and 
it's really much simpler than the possible solution I was thinking about.


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