enumerize_reloaded.rb

class Enum
  def self.new
    Class.new do
      def self.const_missing(name)
        const_set(name, new)
      end
    end
  end
end
  
Color = Enum.new
ThreatLevel = Enum.new

puts Color::Red     # => #<Color:0x100189b28>
puts Color::Blue    # => #<Color:0x100189a60>
 
puts Color::Red != Color::Blue  # => true
puts Color::Red == Color::Red   # => true

puts Color::Orange != ThreatLevel::Orange # => true

p Color.constants         # => ["Blue", "Red", "Orange"]
p ThreatLevel.constants   # => ["Orange"]