Programming with roles, a demo

Dear Klaus,
Thank you for pointing me in the right direction. It proved fairly
straight forward to open for programming with dynamic roles by hacking
the Parser/Encoder. I also added some other extensions to make the roles
visible in the debugger and to show them with the right value.

I used this extension as the foundation for a demo and talk at the ETH,
Zürich, Switzerland. The complete program can be loaded from two packages:
       http://folk.uio.no/trygver/babymc/BabyPragmaroles-TRee.2.mcz
              that shows what I have done to the Parser etc.
       http://folk.uio.no/trygver/babymc/BabyETH-TRee.11.mcz
              that contains the demo itself and illustrates my first
excursion into programming with roles.
If anybody should want to load these packages, BabyPragmaroles must be
loaded first, otherwise the BabyETH methods will not be properly compiled.

But loading is not necessary because a fully loaded image is stored in
the following zip file that contains image and changes files (note:
Squeak 3.10.6 which is Squeak3.10.gamma.7159):
       http://folk.uio.no/trygver/2007/BabyETHImage.ZIP

I post this to the squeak-dev list in case anybody would like to see a
snapshot of what I'm up to these days.
I've added a lot of comments that may explain more than they confuse.

My next steps: Larger examples and badly needed programming tools.

Enjoy
-- Trygve

--

Trygve Reenskaug      mailto: [hidden email]
Morgedalsvn. 5A       http://folk.uio.no/trygver
N-0378 Oslo           Tel: (+47) 22 49 57 27
Norway
 

Dear Trygve,

I've played with your star field .image, looks good :)

Also, browsing senders of #Role: and of #<role-name> shows what's going on  
and where things belong to. This is one of the advantages of declaring  
pragmas in methods.

I'm looking forward to your next steps, perhaps with role-aware Traits?  
(which then could be attached everywhere :)

Cheers
Klaus

On Mon, 17 Dec 2007 17:41:08 +0100, Trygve Reenskaug wrote: