[closer-devel] Re: Layered function troubles

[Pascal Costanza]

On 20 Feb 2006, at 18:10, Nick Bourner wrote:

> Hmm. In case anyone else has a similar problem, the blindingly  
> stupid mistake was sloppy programming on my part. I had assumed  
> that define-layered-method worked the same as defmethod, so I could  
> get away without using define-layered-function first because define- 
> layered-method would do it for me, especially since I got a warning  
> saying that the generic function had implicitly been created. Bad  
> assumption. It all works fine as long as you remember to use define- 
> layered-function to create the generic first.

I have tried to make it work that you don't need so say (define- 
layered-function ...), but unfortunately, the CLOS MOP does not allow  
me to express this - at least, it's not obvious to me how to do that.  
(There are some subtleties wrt the :argument-precedence-order  
argument to ensure-generic-function that are not that nice to deal  
with...)

Sorry...


Pascal

-- 
Pascal Costanza, mailto:pc at p-cos.net, http://p-cos.net
Vrije Universiteit Brussel, Programming Technology Lab
Pleinlaan 2, B-1050 Brussel, Belgium