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The semantics of Union are those common to C++ unions and Ada discriminated records.

Typically the fields of a union are all physically allocated at the same address. As a result, the size of the union is the size of the largest of its fields.


Metaclass Union
Extends Classfier, StructuredType
Description A structure that stores the value of exactly one of a set of fields at any given time

Language Mappings

Union maps to the C++ concept of union. A discriminated union corresponds to an Ada discriminated record.

See Also