EnumeratedType (define numerical constants quickly)

enumtype.rb

# EnumeratedType lets you create enumerated types like this:
#
#   class OutputType < EnumeratedType
#     AUTODETECT
#     UNKNOWN
#     NOSOUND
#     WAVWRITER
#     DSOUND
#     WINMM
#     ASIO
#     OSS
#     ALSA
#     ESD
#     SOUNDMANAGER
#     COREAUDIO
#     XBOX
#     PS2
#     GC
#     XBOX360
#     PSP
#   end
#
# If you want to start with a different integer than 0, you can just do:
#
#   class OutputType < EnumeratedType
#     start 15
#     AUTODETECT
#     ...
#   end
#
# You can also use start anywhere in the list, to have subsequent constants
# enumerated starting with the given value.
#
# (c)2005 Jamis Buck

class EnumeratedType
  class << self
    def start(n, orable=false)
      @next_value = n
      @orable = orable
    end

    def const_missing(sym)
      @next_value ||= 0
      const_set(sym, @next_value)
      if @orable
        @next_value *= 2
      else
        @next_value += 1
      end
    end
  end
end