does objective-c has generic types (and with constraints) similar to c#?

Question

Example Generic Repository:

public interface IGenericRepository<T> where T : class
{
    IQueryable<T> GetAll();
    IQueryable<T> FindBy(Expression<Func<T, bool>> predicate);
    void Add(T entity);
    void Delete(T entity);
    void Update(T entity);
    void Save();
}

I am looking to use the repository pattern in model layer of my application and can't seem to find much on the subject when comparing c# generic types to objective-c.

You do have `@interface IGenericRepository<__covariant T: ConstraintClass> : NSObject`. — Iulian Onofrei, Oct 30 '19 at 23:15

score 1 · Answer 1 · edited May 23 '17 at 12:14

1

No, there're no generic types in objective-c.

Use of generics is closest to the use of id in Objective-C collection classes such as NSDictionary.

you could refer to C# programming introduced to Objective-C programmers

and this similar question on SO Are there strongly-typed collections in Objective-C?

edited May 23 '17 at 12:14

Community

1
1

answered May 20 '13 at 23:24

terry

1,569
11
19

score 0 · Answer 2 · answered Sep 23 '15 at 19:29

As of Xcode 7, Objective C and Swift 2 now support Generics.

They are defined like this @interface NSArray<__covariant ObjectType> or @interface NSDictionary<KeyType, ObjectType>

as taken from the header file of NSArray and NSDictionary. They provide type checking at compile time.

does objective-c has generic types (and with constraints) similar to c#?

2 Answers2