OOPS:Use of parameter table

For dynamic method call, one can use the concept of PARAMETER TABLE to include references of all interface parameters of the method(instead of mentioning them separately).
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REPORT YSUBOOPS24 .

DATA : i_result type i,
i_num type i value 5 .
DATA f(2) TYPE c VALUE 'M1'.

CLASS cl_abap_objectdescr DEFINITION LOAD .

DEFINE : poptable.
ptab_line-name = &1.
ptab_line-kind = CL_ABAP_OBJECTDESCR=>&2.
GET REFERENCE OF &3 INTO ptab_line-value.
INSERT ptab_line INTO TABLE ptab.
IF sy-subrc ne 0.
EXIT.
ENDIF.
END-OF-DEFINITION.

CLASS c1 DEFINITION.
PUBLIC SECTION.
METHODS m1 IMPORTING p1 TYPE i
exporting p3 type i .
ENDCLASS.

CLASS c1 IMPLEMENTATION.
METHOD m1.
p3 = p1 + 200.
ENDMETHOD.
ENDCLASS.

DATA r TYPE REF TO c1.
DATA: ptab TYPE abap_parmbind_tab,
ptab_line LIKE LINE OF ptab.

START-OF-SELECTION.

poptable : 'P1' EXPORTING i_num ,
'P3' IMPORTING i_result .

CREATE OBJECT r TYPE c1.
CALL METHOD r->(f) PARAMETER-TABLE ptab.
write:/5 i_result .


Output 205