[Openmcl-devel] Class redefinition demo

Ron Garret ron at awun.net
Sat Jun 6 17:01:10 UTC 2009


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

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