module Timeable
attr_reader :time_created
def initialize
@time_created = Time.now
end
def age #in seconds
Time.now - @time_created
end
end
class Character
include Timeable
attr_reader :name
def initialize( name )
@name = name
super() #calls Timeable's initialize
end
end
c = Character.new "Fred"
c.time_created
# => Mon Mar 27 18:34:31 EST 2006
p Character.ancestors # => [Character, Timeable, Object, Kernel]