Importance of the operator ?=

by Raghavan

?= is called Casting Operator. It is used to instruct ABAP to skip type checking at compile time and do the check at runtime.

For example, the following code would issue a syntax check because at compile time it is not possible to verify if oref1 actually points to an object of the class cl_myclass.

DATA: aref1 TYPE REF TO object,
            bref2 TYPE REF TO cl_someclass.
bref2 = aref1.

So instead we use the casting operator like so.

aref1 ?= bref1 or 

MOVE aref1 ?to bref2.

This shifts the verification to the runtime.


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