meta-class

gistfile1.m

#import <Foundation/Foundation.h>

@interface SuperClass : NSObject

@end

@implementation SuperClass

@end

@interface SubClass : SuperClass

@end

@implementation SubClass

@end


NSLog(@"NSObject class :%p",object_getClass([NSObject class]));

    NSObject *rootObject = [NSObject new];
    Class rootClassFromObject = object_getClass(rootObject);
    NSLog(@"root class from object (before):%p ",rootClassFromObject);
    while (rootClassFromObject != object_getClass([NSObject class])) {
        NSLog(@"root class from object :%p",object_getClass(rootClassFromObject));
        rootClassFromObject = object_getClass(rootClassFromObject);
    }
    
    
    SuperClass *superclassObject = [SuperClass new];
    Class superClassFromObject = object_getClass(superclassObject);
    NSLog(@"super class from object (before) :%p",superClassFromObject);
    while (superClassFromObject != object_getClass([NSObject class])) {
        NSLog(@"super class from object :%p",object_getClass(rootClassFromObject));
        superClassFromObject = object_getClass(superClassFromObject);
    }
    
    
    SubClass *subClassObject = [SubClass new];
    Class subClassFromObject = object_getClass(subClassObject);
    NSLog(@"sub class from object :%@",subClassFromObject);
    while (subClassFromObject != object_getClass([NSObject class])) {
        NSLog(@"sub class from object :%p",object_getClass(subClassFromObject));
        subClassFromObject = object_getClass(subClassFromObject);
    }
    
    
    Class superClassFromSubClass = class_getSuperclass(subClassFromObject);
    NSLog(@"super class from subclass :%p",superClassFromSubClass);
    while (superClassFromSubClass != object_getClass([NSObject class])) {
        NSLog(@"super class from sub class object :%p",object_getClass(subClassFromObject));
        superClassFromSubClass = object_getClass(superClassFromSubClass);
    }