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ABENSET_REFERENCES - SET REFERENCES

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Assigning Reference Variables

Special rules apply when setting the reference or pointer of a reference variable:

• Assignment Rules for Reference Variables

A reference is always set as an upcast or as a downcast. When a reference variable is assigned to another reference variable, two different assignment operators are used, as well as a constructor operator.

• =, ?= - Upcast and Downcast

• CAST - Casting Operator

References in data reference variables can point to existing data objects. There is a statement and a constructor operator for this.

• GET REFERENCE

• REF - Reference Operator

Like all data objects, reference variables are initialized using the statement CLEAR. The content of an initial reference variable is the null reference, which does not point to an object and can be assigned to every reference variable.　

Notes

• The same rules apply to references set when objects are created as to assignments.

• When a reference variable containing a heap reference is initialized, this affects Garbage Collector.

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