From: daz <dooby@...10.karoo.co.uk>
Date: 2005-11-07T08:22:11+09:00
Subject: Re: what does --can't define singleton method-- mean?


Sean O'Halpin wrote:
> On 11/6/05, daz wrote:
> >
> > Sean O'Halpin wrote:
> > > On 11/6/05, Daniel Sch�le wrote:
> > > > irb(main):014:0* class << Complex
> >
> > I think Daniel was, correctly, trying to limit his change
> > to his own object.  He didn't want to affect the class.
>
> If you read what Daniel wrote:
>
  >> [[ I have one more related question ]]
> >> I would like to have the angle method
> >> to return the angle in degrees for each
> >> Complex instance, how can I achieve it
> >> the obvious didn't work for me
>
> and his subsequent message that Complex.class_eval does what he wants
> I think you will see that all he really wanted to do was to redefine
> the instance method for angle which is more usually done by re-opening
> class as I showed.

Yes, I was defending Daniel's possible intentions which were
ambiguous before his follow-up message.
I see now that in his second (related) question, he *was*
wanting to affect the class and that that was the part you
were responding to.


> I would think that most people on this list would agree that this:
> > class Complex
> >   def angle
> >     arg/Math::PI*180.0
> >   end
> > end
>
> is the usual way to do this.
>

Now we're focused on instance methods, I think you're on safe ground ;)

Simple misunderstanding -- no aggression intended.


> Regards,
>
> Sean


daz