-CREATE_MPI_DATATYPE_NULL(MPI_COMPLEX8, 42);
-CREATE_MPI_DATATYPE_NULL(MPI_COMPLEX16, 43);
-CREATE_MPI_DATATYPE_NULL(MPI_COMPLEX32, 44);
+CREATE_MPI_DATATYPE(MPI_COMPLEX8, 42, float_float);
+CREATE_MPI_DATATYPE(MPI_COMPLEX16, 43, double_double);
+CREATE_MPI_DATATYPE(MPI_COMPLEX32, 44, double_double);