From: Trans <transfire@...>
Date: 2007-11-27T23:24:26+09:00
Subject: Re: Metaprogramming help



On Nov 27, 5:15 am, Chris Richards <evilgeen...@gmail.com> wrote:
> Wow, thanks for all your replies.
>
> > BTW: To ensure a routine always runs on initialization despite
> > #initialize, one way:
>
> >   class X
> >     class << self
> >       def new(*a, &b)
> >         o = allocate
> >         o.do_your_thing
> >         o.initialize(*a,&b)
> >         o
> >       end
> >     end
> >   end
>
> > The other is AOP which is a much larger can of worms.
>
> so whats the simplest way to ensure this method was always run ? :
>
> def initialize(x=0, y=0)
>   self.x_position=x
>   self.y_position=y
> end

Why do you want to thwart super here? You should have very clear
reason for doing so, otherwise leave it.

But to answer your question directly:

  class X
    class << self
      def new(*a, &b)
        o = allocate
        o.pre_initialize(*a, &b)
        o.initialize(*a,&b)
        o
      end
    end

    def pre_initialize(x=0, y=0)
      self.x_position=x
      self.y_position=y
    end
  end

T.