Root Class - hewigovens/hewigovens.github.com GitHub Wiki
A root class inherits from no other class and defines an interface and behavior common to all objects in the hierarchy below it. e.g. NSProxy:
NS_ROOT_CLASS
@interface NSProxy <NSObject> {
Class isa;
}NSObject:
OBJC_ROOT_CLASS
OBJC_EXPORT
@interface NSObject <NSObject> {
Class isa OBJC_ISA_AVAILABILITY;
}