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Editorial Team
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Asked: 2026-05-16T15:40:34+00:00

I’m reading the Core Data Utility tutorial from apple documentation and there’s a part

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I’m reading the Core Data Utility tutorial from apple documentation and there’s a part that’s bugging me a bit.

At the beginning of “main” you got:

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
#include <objc/objc-auto.h>

Why you would need to include Foundation.h if it is already included in CoreData.h? the same for objc-auto.h that is inside Foundation.h? And why in the last line is used #include?

Thank you

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1 Answer

  1. Editorial Team

    Why you would need to include Foundation.h if it is already included in CoreData.h?

    You don’t need to, but it doesn’t hurt to be explicit in your code, either. #import prevents it from being imported twice, anyway. Apple’s tutorial likely just wanted to emphasize that you were using some Foundation functionality.

    the same for objc-auto.h that is inside Foundation.h?

    I don’t think objc-auto.h is included in Foundation.h (or anything included by Foundation.h); since you’re using a GC function, you will have to include this header.

    And why in the last line is used #include?

    It’s a C idiom. Apple’s Objective-C style dictates that Objective-C headers are imported, C headers are included. objc-auto.h is C code. You could import it if you wanted to.

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