From: Francois GORET <fg@...>
Date: 2002-12-06T21:54:59+09:00
Subject: Class-instance variables access

Hi,

I try to understand the difference between 'class variables' and 'class 
instance variables', following a post by Guy Decoux a few days ago.

class A
  @x = 12     # (class instance) variable

  def A.test
     puts @x
  end

  def instance_method
     puts @@x   # does not work, I'm sad ;-)
  end
end

 A.new.instance_method
=> NameError: uninitialized class variable @@x in A

I understand that @@x refers only to a (non existant) class variable of A. I 
don't catch why there is a distinction between a class instance variable and 
a class variable: the two are "stored" in the unique object representing the 
class A, no ? 

Is there a way to access the x variable from an instance of A ?

Francois