From: Robert Dober <robert.dober@...>
Date: 2006-08-18T15:46:52+09:00
Subject: Re: How to - Change operator behaviour

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On 8/17/06, Simen Edvardsen <toalett@gmail.com> wrote:
>
> On 8/17/06, Henry Savr <hsavr@yahoo.com> wrote:
> > It's new behaviour should be like this:
> >
> > class Time1 < Time
> >   def >(other)
> >     case other.class.name
> >         when "Time"
> >                 return self > other # but use the OLD > method
> definition.
> >         when ("NilClass")
> >                 return true
> >         else
> >               # do what Ruby does originally in this case : when one
> operand is
> > Time, and other not the Time.
> >         end
> > end
>
> Unrelated hat tip: many classes define the #=3D=3D=3D method, for "case
> equality", and it's used in case statements. Your code could be
> simplified to


case object1
   when object2
triggers object2's =3D=3D=3D method with object1 as its sole parameter...


  case other
>     when Time
>       self > other


 Just to see "How deep is your Stack?"


>     when NilClass
>       true
>     end


...therefore Time's =3D=3D=3D method is triggered  which is defined in Clas=
s.
Unless  one un/redefines the "=3D=3D=3D" method from a Class objetc
(e.g. class << String undefine_method :=3D=3D=3D ; end ) one can always rel=
y on
=3D=3D=3D from classes to check for instance

<snip>

Cheers
Robert

--=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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