From: matz@... (Yukihiro Matsumoto)
Date: 2001-08-18T13:17:17+09:00
Subject: [ruby-talk:19965] Re: problem understanding class relationships

Hi,

In message "[ruby-talk:19960] problem understanding class relationships"
    on 01/08/18, Tobias Reif <tobiasreif@pinkjuice.com> writes:

|Thus all classes are in the same family
|and thus @@ variables would be shared among all objects.
|
|Where am I erring?

Like constants, class variables must be assigned at the class/module
top level, and shared among its subclasses.

  class Foo
    @@foo = 43	# @@foo is assigned (declared) here.
  end

  class Bar<Foo
    def bar
      p @@foo	# @@foo is available.
    end
  end

  class Baz<Object
    def baz
      p @@foo	# @@foo is NOT available here.
    end
  end

							matz.