Question about unexpected result with class variables and inheritance

ruby-talk
1

Let’s consider the following code:

class A
@@x = 1
def A.x
return @@x
end
end

class B < A
@@x = 2
end

class C < A
@@x = 3
end

p A.x
3
p B.x
3
p C.x
3

Why do A.x, B.x, and C.x all return 3? The results I would have expected
are: 1, 2, 3. Is this supposed to be this way? Is there a way to get the
results, I expected? Is this a FAQ issue? Did I get it all wrong? BTW, I
use ruby 1.8.1 (2003-12-25) [i386-cygwin].

Regards,
Thomas.

2

Thomas, you are right, it is a question that has recurred more than once in this newsgroup / on this mailinglist.
You may find your answer effortlessly by Googel-ing this group with “class variables” or so.