https://github.com/travelping/flower/blob/master/src/flower_packet.erl#L202-L220 https://github.com/travelping/flower/blob/master/src/flower_packet.erl#L239-L257

gistfile1.ex

  to_generate =
    [bad_request: [bad_version: 0,
                   bad_type: 1,
                   bad_stat: 2,
                   bad_experimenter: 3,
                   bad_subtype: 4,
                   eperm: 5,
                   bad_len: 6,
                   buffer_empty: 7,
                   buffer_unknown: 8],
     bad_action: [bad_type: 0,
                  bad_len: 1,
                  bad_vendor: 2,
                  bad_vendor_type: 3,
                  bad_out_port: 4,
                  bad_argument: 5,
                  eperm: 6,
                  too_many: 7,
                  bad_queue: 8]]

  lc {error_type, values} inlist to_generate do
    lc {atom, num} inlist values do
      def ofp_error_code_type(unquote(error_type), unquote(atom)), do: unquote(num)
      def ofp_error_code_type(unquote(error_type), unquote(num)), do: unquote(atom)
    end
  end