Calling method of object whose type is not known until runtime

[Former Member]

Hiya,

In SE80 class builder I have attribute R_OBJECT TYPE REF TO OBJECT.

In my CONSTRUCTOR method, I do a:

CREATE OBJECT R_OBJECT TYPE (lc_variable)

,where lc_variable contains type I want to use.

This seems to compile, but when I try to call a method using the following statement, the compiler complains saying that the method is not known. Well, of course it's not known, I haven't told it which class the object belongs to yet!

CALL METHOD R_OBJECT->MY_METHOD RECEIVING lc_result.

What am I doing wrong?

Thanks,

Tristan

[Former Member]

Hiya,

In SE80 class builder I have attribute R_OBJECT TYPE REF TO OBJECT.

In my CONSTRUCTOR method, I do a:

CREATE OBJECT R_OBJECT TYPE (lc_variable)

,where lc_variable contains type I want to use.

This seems to compile, but when I try to call a method using the following statement, the compiler complains saying that the method is not known. Well, of course it's not known, I haven't told it which class the object belongs to yet!

CALL METHOD R_OBJECT->MY_METHOD RECEIVING lc_result.

What am I doing wrong?

Thanks,

Tristan

[uwe_schieferstein]

Hello Tristan

The <b>static</b> type of r_object is OBJECT and, therefore, will never have any methods you have defined. In order to call your method you must do <b>narrow casting</b>, e.g:

DATA:
  lo_myclass     TYPE REF TO <lc_variable>.  " your class


CREATE OBJECT R_OBJECT TYPE (lc_variable).

* Narrow casting required
  lo_myclass ?= r_object.

  lc_result = lo_myclass->my_method( ).  " now it works

Regards

Uwe