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destination_ref =$|?= source_ref.
Assignment between two reference variables. The reference in source_ref is assigned destination_ref. After a successful assignment, destination_ref points to the same object as source_ref (reference semantics). The assignment of reference variables is a special form of assignments of data objects, whereby two assignment operators are available for assignments between reference variables and are used in accordance with the assignment rules for reference variables:
The same applies to the right side and left side as when assigning data objects, with the following restrictions:
The first two assignments in the following source code section are upcasts:
The next two assignments are downcasts: