Rational Developer for System z
Enterprise PL/I for z/OS, Version 4.2, Language Reference

DEFINED and UNION attributes

You can also use the DEFINED and UNION attributes to overlay variable storage, but DEFINED and UNION overlay the storage permanently. When based variables are overlaid with a locator reference, the association can be changed at any time in the program by assigning a new value to the locator variable.

For more information on the DEFINED and UNION attributes, see DEFINED and POSITION attributes, and Unions.


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