From: JP Billaud <jp.billaud@...>
Date: 2011-03-07T09:45:06+09:00
Subject: Class Variables in EigenClass

I am using Ruby 1.8.7 and I bumped into a weird behavior regarding
eigenclass of Class object.

Below, I am declaring a class variable inside the eigenclass of Class A.
However for some reasons when I print out the class variables of A and
B, it seems the class variable @@test is accessible for both.

===

def eigen
  class << self
    self
  end
end

class A
end

class B
end

egA = A.send :eigen
puts egA.object_id

egB = B.send :eigen
puts egB.object_id

egA.class_eval do
  @@test = 5
end

puts "A Class Variables"
puts A.class_variables

puts "B Class Variables"
puts B.class_variables

===


>-607970628
>-607970668
>A Class Variables
>@@test
>B Class Variables
>@@test

Any idea?

Thanks,

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