Attribute Has_Access_Values (GNAT Reference Manual)

### 4.29 Attribute Has_Access_Values ¶

The prefix of the `Has_Access_Values` attribute is a type. The result is a Boolean value which is True if the is an access type, or is a composite type with a component (at any nesting depth) that is an access type, and is False otherwise. The intended use of this attribute is in conjunction with generic definitions. If the attribute is applied to a generic private type, it indicates whether or not the corresponding actual type has access values.