The Class Attribute of Untagged Incomplete Types
Author: JTC1/SC22/WG9/ARG, by Randall Brukardt, ARG Editor

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# J.11 The Class Attribute of Untagged Incomplete Types

#### Static Semantics

1/2
For the first subtype S of a type T declared by an incomplete_type_declaration that is not tagged, the following attribute is defined:
2/2
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.

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