[Openmcl-devel] Class redefinition demo

Terje Norderhaug terje at in-progress.com
Sat Jun 6 10:55:51 PDT 2009

Thank you Gary and Ron for respectively creating the patch and  
providing the stripped down version. I'll start using it right away.

PS: I suggest we make a habit of using #+rmcl in patches to  
distinguish code for RMCL from code meant for PPC MCL. Or at least  
that it warns if used for the wrong LISP.

-- Terje Norderhaug

On Jun 6, 2009, at 10:01 AM, Ron Garret wrote:
> For those of you playing with RMCL, there's a bug that causes class  
> redefinition not to work properly.  Gary has produced a patch,  
> which is at
> ftp://clozure.com/pub/rmcl-updates
> Because I'm allergic to FTP, a stripped-down version of the patch  
> is included in this email which you can just load into RMCL.  No  
> need to rebuild the app if you don't want to.
> This patch has allowed me to resurrect my favorite Lisp demo of all  
> time, which is also attached.  It's called draggable, and it's a  
> dramatic illustration of the power of class redefinition.  Load the  
> demo.  It will open a window with a bunch of text objects.  Click  
> on them and try to drag them around and observe that nothing  
> happens.  Now evaluate the first of the commented-out lines at the  
> bottom of the file and try dragging them around again.  Now  
> evaluate the second line and repeat.
> Let's see someone do *that* in Python!
> Enjoy!
> rg
> <rmcl-clos-patch.lisp>
> <draggable.lisp>
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