> On May 8, 2017, at 6:21 PM, Giacomo Leopizzi via swift-dev > <swift-dev@swift.org> wrote: > Hello everyone! > I was discussing with a friend about metaclasses in Objective-C. In Obj-C the > root meta-class was the NSObject's one.
ObjC does not have a single root class. Most ObjC classes inherit from NSObject, but that is not guaranteed, and in fact there are other common root classes including NSProxy. > When in a swift class you create a subclass of NSObject, the root metaclass > should be the same. What happen when you delcare a class without NSObject > dependence? There is an hidden root-class? Where can we read more about this > topic? When ObjC interop is enabled, Swift classes that do not inherit from NSObject use a private root class. However, that is a private implementation detail and we don't promise much about it. Do you have any specific questions? John. _______________________________________________ swift-dev mailing list swift-dev@swift.org https://lists.swift.org/mailman/listinfo/swift-dev
