[ ruby-Bugs-8156 ] class variables and inheritance

Bugs item #8156, was opened at 2007-01-25 23:05
You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=8156&group_id=426

Category: Core
Group: 1.8.4
Status: Open
Resolution: None
Priority: 3
Submitted By: Lance Ivy (cainlevy)
Assigned to: Nobody (None)
Summary: class variables and inheritance

Initial Comment:
The unexpected behavior is shown in this script:

---------------
#!/usr/bin/ruby

class A
  def self.foo
    @@foo
  end

  def self.foo=(val)
    @@foo = val
  end
end

class B < A; end
class C < A; end

A.foo = 'a'
B.foo = 'b'
C.foo = 'c'

puts A.foo
puts B.foo
puts C.foo
---------------

When I run this, I expect to see:
a
b
c

But instead I see:
c
c
c

----------------------------------------------------------------------

Comment By: Adam Bozanich (abozanich)
Date: 2007-04-16 08:02

Message:
Why would you expect that?

you can do what you want like so:

class A
    class << self
        def foo
            @foo
        end
        def foo=(val)
            @foo = val
        end
    end
end

class B < A ; end
class C < A ; end

A.foo = 'a'
B.foo = 'b'
C.foo = 'c'

puts A.foo , B.foo , C.foo


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You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=8156&group_id=426