module BinData::BitField

def define_methods(bit_class, nbits, endian)
  bit_class.module_eval <<-END
    def assign(val)
      #{create_clamp_code(nbits)}
      super(val)
    end
    def do_write(io)
      io.writebits(_value, #{nbits}, :#{endian})
    end
    def do_num_bytes
      #{nbits / 8.0}
    end
    #---------------
    private
    def read_and_return_value(io)
      io.readbits(#{nbits}, :#{endian})
    end
    def sensible_default
      0
    end
  END
end