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Editorial Team
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Asked: 2026-05-24T13:32:15+00:00

I’m creating an NSDictionary which maps objects to integers, and because NSDictionaries don’t handle

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I’m creating an NSDictionary which maps objects to integers, and because NSDictionaries don’t handle anything but objects I have to wrap each integer in an NSNumber object with [NSNumber numberWithInt:30] or what have you. What I’m not clear about is whether or not I need to release all of those NSNumber objects I’m creating. I’m not actually alloc’ing the space for them, so they must be in the autorelease pool, but can I be sure that the NSDictionary object is retaining and releasing them properly? Let’s say I’m setting

NSDictionary * myDict = [[NSDictionary alloc] initWithObjectsAndKeys: objectOne, [NSNumber numberWithInt: 30], nil];

and I’m properly releasing the NSDictionary when I’m done with it (since I am alloc’ing the space for that within my own code).

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1 Answer

  1. Editorial Team

    nope the NSNumber objects are autoreleased.

    Adding them to an NSDictionary will cause a retain message to be send to each NSNumber object you add.

    According to the Memory Management Rules you don’t own these objects – NSDictionary does that somehow – and thus you are not responsible releasing them, the NSDictionary object will do that.

    But you own the NSDictionary created with alloc & initWithObjectsAndKeys:. Therefore you need to take care about managing memory of the myDict object.

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