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J.11 The Class Attribute of Untagged Incomplete Types

Static Semantics

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For the first subtype S of a type T declared by an incomplete_type_declaration that is not tagged, the following attribute is defined:

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S'Class

Denotes the first subtype of the incomplete class−wide type rooted at T. The completion of T shall declare a tagged type. Such an attribute reference shall occur in the same library unit as the incomplete_type_declaration.