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Re: [Chicken-users] handle "unbound variable" exception for undefined pr


From: Peter Bex
Subject: Re: [Chicken-users] handle "unbound variable" exception for undefined procedures?
Date: Wed, 24 Dec 2008 12:07:12 +0100
User-agent: Mutt/1.4.2.3i

On Wed, Dec 24, 2008 at 11:53:15AM +0100, Tobia Conforto wrote:
> Mind you, this is the simplest implementation possible, without  
> inheritance, polymorphism or anything useful.  But if you find (or  
> write) a full-fledged object system that works like this (probably  
> based on table lookup instead of static pattern matching) then you  
> will have no trouble adding a handler for unknown methods that fetches  
> the definitions on the fly.

One such object system is Prometheus, for which there's a Chicken egg.
It has a message-not-understood message, which is sent to the object
when the object nor any of its prototypes know of the message.

Cheers,
Peter
-- 
http://sjamaan.ath.cx
--
"The process of preparing programs for a digital computer
 is especially attractive, not only because it can be economically
 and scientifically rewarding, but also because it can be an aesthetic
 experience much like composing poetry or music."
                                                        -- Donald Knuth

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