topic Re: CASTING in Application Development and Automation Discussions

CASTING

Former Member — Wed, 24 Jan 2007 08:29:14 GMT

REPORT ZRAVI_05.

class ravi definition.

public section.

methods: ex IMPORTING A TYPE I B TYPE I,DISP.

DATA: D TYPE I,E TYPE I.

ENDCLASS.

CLASS RAVI IMPLEMENTATION.

METHOD EX.

D = A.

E = B.

CALL METHOD DISP( ).

ENDMETHOD.

METHOD DISP.

WRITE: / D,E.

ENDMETHOD.

ENDCLASS.

CLASS RAVI1 DEFINITION INHERITING FROM RAVI.

PUBLIC SECTION.

METHODS:EX REDEFINITION,ADD.

ENDCLASS.

CLASS RAVI1 IMPLEMENTATION.

METHOD EX.

CALL METHOD SUPER->EX( A = A B = B ).

DATA: R TYPE I.

R = A + B.

WRITE: / R.

ENDMETHOD.

METHOD ADD.

WRITE: / 'HELLO'.

ENDMETHOD.

ENDCLASS.

DATA: R_RAVI TYPE REF TO RAVI,R_RAVI1 TYPE REF TO RAVI1.

START-OF-SELECTION.

CREATE OBJECT R_RAVI.

CREATE OBJECT R_RAVI1.

R_RAVI = R_RAVI1.

R_RAVI->ex( A = 4 B = 5 ). "THIS STATEMENT WORKS GOOD

R_RAVI->ADD( ). "THIS STATEMENT IS GIVING AN ERROR

Re: CASTING

Former Member — Wed, 24 Jan 2007 09:30:24 GMT

The Method add belongs to Class Ravi1 and can be accessed only by object Ravi1 and Ravi so the statement for that is

R_RAVI1->ADD( ) and not R_RAVI->ADD .

Re: CASTING

Former Member — Wed, 24 Jan 2007 11:08:37 GMT

my question is about upcasting or narrow casting when the narrow casting is done how to access the method in the subcalss using the superclass object.