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Groups > comp.lang.ruby > #2922

Re: looking for an "inversion" pattern

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@Kevin:

Kevin Mahler wrote in post #992945:
>   ...
>   def define_foo(obj, clazz, method)
>     obj.singleton_class.class_eval do
>       define_method :foo do
>         Class.new do
>           define_method method do |*args|
>             clazz.send(method, obj, *args)
>           end
>         end.new
>       end
>     end
>   end

That's some mighty fine code-fu -- back in the day I had no problem with 
metaprogramming constructs in scheme, but I'm not yet at ease with the 
syntax and class structure of Ruby.

> Returning facade or proxy objects like this can be an elegant solution
> to certain problems. It's rather high on the abstraction ladder, though,
> and without knowing the context I would wonder if more direct solutions
> are possible.

Well, yes -- as per my previous post.  Since you must call define_foo() 
for each object & method you want to cover, I don't see a lot of 
advantage to the approach.  But it does show off Ruby's function 
defining tricks nicely.

-- 
Posted via http://www.ruby-forum.com/.

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Thread

looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 00:16 -0500
  Re: looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 01:27 -0500
    Re: looking for an "inversion" pattern Robert Klemme <shortcutter@googlemail.com> - 2011-04-15 04:24 -0500
      Re: looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 10:40 -0500
        Re: looking for an "inversion" pattern Robert Klemme <shortcutter@googlemail.com> - 2011-04-16 15:29 +0200
  Re: looking for an "inversion" pattern Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-15 02:14 -0500
    Re: looking for an "inversion" pattern Fearless Fool <r@alum.mit.edu> - 2011-04-15 02:43 -0500
      Re: looking for an "inversion" pattern Kevin Mahler <kevin.mahler@yahoo.com> - 2011-04-15 08:44 -0500
    Re: looking for an "inversion" pattern 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-16 13:20 -0500
      Re: looking for an "inversion" pattern 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-16 13:43 -0500
  Re: looking for an "inversion" pattern Jesús Gabriel y Galán <jgabrielygalan@gmail.com> - 2011-04-15 02:45 -0500
  Re: looking for an "inversion" pattern Brian Candler <b.candler@pobox.com> - 2011-04-16 16:14 -0500
    Re: looking for an "inversion" pattern Robert Klemme <shortcutter@googlemail.com> - 2011-04-16 23:40 +0200

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