From: ara.t.howard@...
Date: 2006-12-11T02:08:24+09:00
Subject: Re: bending ruby space

On Mon, 11 Dec 2006, Trans wrote:

> in any case you all are partly right of course. but the neat part of
> this  --the real "bending" and the reason it uses two modules the way
> it does....
>
>  module R; end
>  module U; include R; end
>  module R; extend U; end
>
>  module R
>    def x; "x"; end
>  end
>
>  module U
>    def x; "{" + super + "}"; end
>  end
>
>  R.x  #=> "{x}"
>
> the effect is *dynamic* AOP wrapping of R by U. it is dynamic b/c it is
> possible to define the "aspect" U prior to any corresponding method in
> R. (btw, 'if  defined?(super)' is helpful in such cases). I used this
> myself to cache specifically named methods that may, or may not, be in
> a user-defined code snippet.
> it is unfortuate however that, afaict, the same pattern can't be used
> on a class --just a module.

dynamically injectable 'super' - very useful.

cheers.

-a
-- 
if you want others to be happy, practice compassion.
if you want to be happy, practice compassion.  -- the dalai lama