double2_add double2_eq double2_in double2_out double2_recv double2_send double2_set double3_add double3_eq double3_in double3_out double3_recv double3_send double3_set double4_add double4_eq double4_in double4_out double4_recv double4_send double4_set tdouble2_in tdouble3_in tdouble4_in

double2_out() Datum double2_out ( PG_FUNCTION_ARGS  ) Output function for double2 values (stub only)