`Class` instances could only be made possible by making`Class` a Swift`class` and not a`struct`, due to limitations in Swift's type system and several abstractions Swift imposes on the user. Therefore, they do not have the same underlying structure as`Object` does (that is,`Class` does not start with the`isa` defined by the`Object` declaration). To call a class method on a class, pass`.ref` as`this`:

_msgSend(Person.class.ref,"someClassMethod")

In general, use`class.ref` whenever you wish to treat a`Class` as an object.