From: Rich Kilmer <rich@...>
Date: 2002-11-11T14:02:34+09:00
Subject: Re: Klass.method(:new).arity == -1 violates my POLS!

I don't know about Ruby v1.6 but in v1.7 with the new allocation
framework you can do this:

K.allocate.method(:initialize).arity #=> 1

The problem is the initialize method is private instance method, so I
don't know how you can get ahold of it to get its arity without an
instance (which allocate gives you without calling initialize).

-rich

> -----Original Message-----
> From: coma_killen@fastmail.fm [mailto:coma_killen@fastmail.fm] 
> Sent: Sunday, November 10, 2002 11:50 PM
> To: ruby-talk ML
> Subject: Klass.method(:new).arity == -1 violates my POLS!
> 
> 
> Hi,
> 
> This is not what I expected:
> 
> class K
>   def K.newp(a); end
>   def initialize(a); end
> end
> 
> p K.method(:newp).arity #=> 1
> p K.method(:new).arity #=> -1
> 
> My intuition would be that the knowledge that initialize
> takes only 1 param would be known to the new method. I think 
> this might make sense if you've fully grasped Ruby's dynamic 
> nature => I haven't.
> 
> Anyone can explain why it has to be like this?
> 
> Is there some way to get to know the arity of new/initialize?
> 
> Regards,
> 
> Karsten
> 
> 
> --
> http://fastmail.fm - mmm... fastmail...
> 
> 
>