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@kbaird
Created February 15, 2009 17:54
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#!/usr/bin/env ruby
# vehicle.rb
class Vehicle
MEDIUM = :ground
def self.medium; self::MEDIUM; end
# Using MEDIUM instead of self::MEDIUM makes Aircraft use the ground
end
class Car < Vehicle; end
module Flyable
MEDIUM = :air
end
class Aircraft < Vehicle
include Flyable
end
if (__FILE__ == $0)
puts File.read(__FILE__)
puts
puts 'Produces:'
puts
[Vehicle, Car, Aircraft].each do |klass|
puts "#{klass}.medium = #{klass.medium}"
end
end
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