topic Re: Inheritance in Application Development and Automation Discussions

Inheritance

Former Member — Wed, 16 Nov 2005 00:27:27 GMT

Can anybody tell whether inheritance in supported in 4.5b ?

Thks

Re: Inheritance

Former Member — Wed, 16 Nov 2005 00:28:53 GMT

Yes it supports.

Cheers,

Satya

Re: Inheritance

RichHeilman — Wed, 16 Nov 2005 00:34:59 GMT

From this link it would appear that inheritance was not supported untill 46.

http://help.sap.com/saphelp_46b/helpdata/en/c8/c7f9bdaa28d3119b440060b0671acc/frameset.htm

Regards,

Rich Heilman

Re: Inheritance

Former Member — Wed, 16 Nov 2005 00:35:21 GMT

John,

SAP has not implemented inheritance in the BOR. However, it has provided subtyping and delegation, which offer an alternative way to extend R/3 functionality.

Cheers

Raghava

Re: Inheritance

Former Member — Wed, 16 Nov 2005 00:37:16 GMT

see example code in 4.6b

REPORT demo_inheritance.

CLASS counter DEFINITION.

PUBLIC SECTION.

METHODS: set IMPORTING value(set_value) TYPE i,

increment,

get EXPORTING value(get_value) TYPE i.

PROTECTED SECTION.

DATA count TYPE i.

ENDCLASS.

CLASS counter IMPLEMENTATION.

METHOD set.

count = set_value.

ENDMETHOD.

METHOD increment.

ADD 1 TO count.

ENDMETHOD.

METHOD get.

get_value = count.

ENDMETHOD.

ENDCLASS.

CLASS counter_ten DEFINITION INHERITING FROM counter.

PUBLIC SECTION.

METHODS increment REDEFINITION.

DATA count_ten(1) TYPE c.

ENDCLASS.

CLASS counter_ten IMPLEMENTATION.

METHOD increment.

DATA modulo TYPE i.

CALL METHOD super->increment.

WRITE / count.

modulo = count MOD 10.

IF modulo = 0.

count_ten = count_ten + 1.

WRITE count_ten.

ENDIF.

ENDMETHOD.

ENDCLASS.

DATA: count TYPE REF TO counter,

number TYPE i VALUE 5.

START-OF-SELECTION.

CREATE OBJECT count TYPE counter_ten.

CALL METHOD count->set EXPORTING set_value = number.

DO 20 TIMES.

CALL METHOD count->increment.

ENDDO.

Re: Inheritance

RichHeilman — Wed, 16 Nov 2005 00:38:15 GMT

In 46b, yes it is supported. Not in 45b. Check this link.

http://help.sap.com/saphelp_nw04/helpdata/en/c3/225b6254f411d194a60000e8353423/content.htm

Particularly the part where it says....

<i>

ABAP Objects makes this possible by using interfaces. Interfaces are independent structures that you can implement in a class to extend the scope of that class. The class-specific scope of a class is defined by its components and visibility sections. For example, the public components of a class define its public scope, since all of its attributes and method parameters can be addressed by all users. The protected components of a class define its scope with regard to its subclasses. <b>(However, inheritance is not supported in Release 4.5B).</b>

</i>

Regards,

Rich Heilman

Re: Inheritance

RichHeilman — Wed, 16 Nov 2005 00:39:17 GMT

Please make sure to award points and mark you post as solved when answered completely. Thanks.

Regards,

Rich Heilman

Re: Inheritance

Former Member — Wed, 16 Nov 2005 00:39:42 GMT

Sorry John I am talking about 4.6B

Re: Inheritance

Former Member — Wed, 16 Nov 2005 00:40:59 GMT

Thanks