From: Joel VanderWerf <vjoel@...>
Date: 2002-08-05T07:56:31+09:00
Subject: Re: Can I get a method object for a class method?

Ned Konz wrote:
> On Sunday 04 August 2002 03:18 pm, Jim Freeze wrote:
> 
> 
>>Is is possible to get a pointer to a class method as in the
>>code below:
> 
> 
> 
> class A
>   def self.xyz
>     p "I'm xyz"
>   end
>   @@classMeth = method(:xyz)
>   def initialize
>     @f1 = @@classMeth
>   end
>   def test
>     @f1.call
>   end
> end
> 
> A.new.test
> 

If you subclass A, this will bite you:

   class B < A
     def self.xyz
       p "I'm xyz in B"
     end
   end

   B.new.test    # ==> "I'm xyz"

Instead:

   class A
     def initialize
       @f1 = self.class.method(:xyz)  # or use 'type' for 'self.class'
     end
   end

   B.new.test    # ==> "I'm xyz in B"