classvars4.rb

download original

module M

  Cv = [42]

  def self.append_features(base)
    super
    base.extend(ClassMethods)
  end

  module ClassMethods
    def cv
      Cv[0]
    end

    def cv=(x)
      Cv[0]=x
    end
  end

end


class C
  include M

  puts cv  # 42
  self.cv=23
  puts cv  # 23
end


class C2
  include M

  puts self.cv  # 23
end


class C3
  include M
end


puts C3.cv  # 23

C3.class_eval "self.cv=38"

puts C3.cv  # 38
puts C.cv   # 38

back to test