From: Robert Dober <robert.dober@...>
Date: 2007-08-03T18:25:36+09:00
Subject: Re: From method redefinition to classless Ruby.

On 8/3/07, Trans <transfire@gmail.com> wrote:
>
>
> On Aug 2, 4:43 pm, "Robert Dober" <robert.do...@gmail.com> wrote:
> > Hi list
> >
> > Ara's post about method redefinition was extremely rich intellectual
> > food, took some time to digest, but I just thought I share my findings
> > with you.
>
> Ara and Pit are impressive meta-coders indeed. Think Ara might even
> have a Prototype lib
> you'd enjoy.
>
> BTW, if we were all good little scouts and always modularized our code
> one could use:
>
>   class Module
>     # Prepend an "aspect" module to a module.
>     #
>     #   module X
>     #     def x; "x"; end
>     #   end
>     #
>     #   module U
>     #     def x; '{' + super + '}'; end
>     #   end
>     #
>     #   X.prepend U
>     #
>     #   X.x  # => "{x}"
>
>     def prepend( aspect )
>       aspect.send(:include, self)
>       extend aspect
>     end
>   end
>
> Another trick for common injuns:
>
>   class Class
>
>     # Prepend an "aspect" module to a class.
>     #
>     # class Firetruck
>     #   def put_out_fire(option)
>     #     "Put out #{option}"
>     #   end
>     # end
>     #
>     # module FastFiretruck
>     #   def put_out_fire(option)
>     #     super("very #{option}!")
>     #   end
>     # end
>     #
>     # Firetruck.prepend(FastFiretruck)
>     #
>     # ft = Firetruck.new
>     # ft.put_out_fire('fast') #=> "Put out very fast!"
>
>     def prepend( aspect )
>       _new      = method(:new)
>       _allocate = method(:allocate)
>       (class << self; self; end).class_eval do
>         define_method(:new) do |*args|
>           o = _new.call(*args)
>           o.extend aspect
>           o
>         end
>         define_method(:allocate) do |*args|
>           o = _allocate.call(*args)
>           o.extend aspect
>           o
>         end
>       end
>     end
>
>   end
>
> Albeit that has some unfortunate shortcomings.
>
> T.
Well I do not really see these shortcomings, I'd love to have this
mail as a comment to my blogpost BTW, would you mind?

Concerning Ara's Prototype library I have seen it flying by, I will
have a closer look, sure deserves an Exolink. But probably Ara's had
all the fun for himself already and there is nothing left to do for me
:(.

Cheers
Robert


>
>


-- 
[...] as simple as possible, but no simpler.
-- Attributed to Albert Einstein