From: Robert Dober <robert.dober@...>
Date: 2006-07-14T07:38:40+09:00
Subject: Re: challenge

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On 7/14/06, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
>
> On Fri, 14 Jul 2006, Pit Capitain wrote:
>
> > ara.t.howard@noaa.gov schrieb:
> >> On Fri, 14 Jul 2006 Ara.T.Howard@noaa.gov wrote:
> >>>
> >>>  OPEN =3D File.method 'open'
> >>>
> >>>  class File
> >>>    def self.open(*a) 42 end
> >>>    end
> >>>  end
> >>>
> >>> ## now restore File.open using OPEN - remember that open takes a
> block...
> >>
> >> correction.  start here
> >>
> >>   open_m =3D File.method 'open'
> >>
> >>   class File
> >>     def self.open(*a) 42 end
> >>     end
> >>   end
> >>
> >> using a const makes it too easy and will accomplish what i need to do.
> >
> >  class << File; self; end.class_eval do
> >    remove_method :open
> >  end
>
>
> wow.  learn something every day!
>
>    ~ > cat a.rb
>    class File
>      def File.open(*a) 42 end
>    end
>
>    p File.open(__FILE__)
>
>    class << File; self; end.class_eval do
>      remove_method :open
>    end
>
>    p File.open(__FILE__)
>
>
>
>    ~ > ruby a.rb
>    42
>    #<File:a.rb>
>
>
> i wasn't aware remove_method had this 'stacklike' quality.


It does not, open is defined in IO, and becomes visible again :)

regards.
>
>
> -a
> --
> suffering increases your inner strength.  also, the wishing for suffering
> makes the suffering disappear.
> - h.h. the 14th dali lama
>
>


--=20
Deux choses sont infinies : l'univers et la b=EAtise humaine ; en ce qui
concerne l'univers, je n'en ai pas acquis la certitude absolue.

- Albert Einstein

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