From: Donald Luo <donaldluo@...>
Date: 2006-05-27T17:06:57+09:00
Subject: Re: Extend self?

Really thanks to the quick response, but it seems that the two ways of 
definitions are not really equivalent. Just did an experiment.

If I say

module A
  def self.a
    p 'a'
  end
end

class C
  include A
end

> C.a
NoMethodError: undefined method `a' for C:Class

> c = C.new
> c.a
NoMethodError: undefined method `a' for #<C:0x7e478>

While if I changed the definition of module A to

module A
  extend self
  def a
    p 'a'
  end
end

...

> C.a
NoMethodError: undefined method `a' for C:Class
> c = C.new
> c.a
"a"

Anyone can explain this?

Cheers,
Donald

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