From: Sean O'Halpin <sean.ohalpin@...>
Date: 2005-11-07T06:00:57+09:00
Subject: Re: what does --can't define singleton method-- mean?

On 11/6/05, daz <dooby@d10.karoo.co.uk> 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 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.
All the singleton stuff is a bit of a red herring as far as Daniel is concerned.

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.

Regards,

Sean