Yet another enum...

enum.rb

class Enum
  module EnumMember
    attr_reader :args

    def [](idx)
      args[idx]
    end
  end

  class <<self
    include Enumerable

    def each(&b)
      values.each(&b)
      self
    end

    def values
      constants.map {|c| const_get(c)}
    end

    def enum(*args)
      cl = Class.new(self)
      cl.instance_variable_set("@args", args.freeze)
      cl.extend(EnumMember).freeze
    end

    def inherited(cl)
      class <<cl
        private :new, :allocate
      end
    end
  end
end

class GenericState < Enum
  ACCEPTED = enum "foo"
  UNSURE = enum
end

p GenericState.values
GenericState.each {|s| p s}
p GenericState.map(&:name)

p GenericState::ACCEPTED[0]
GenericState.new