Does Objective-C forbid use of structs?

Question

I\'m new to Objective C

I tried using a simple struct and got

arc forbids objective-c objects in struct

Looking up ARC, it

Answer 1

If you want to use struct in Objective C ( with ARC) use "__unsafe_unretained" attribute.

struct Address {
   __unsafe_unretained NSString *city;
   __unsafe_unretained NSString *state;
   __unsafe_unretained NSString *locality;
};