Memory Leak with NSMutableArray

Question

I am trying to set up a multi-dimensional NSMutableArray. I am initially setting all position to a [NSNumber numberWithInt:0] then replacing the object with another [NSNumber numberWithInt:4] (for example). When I am done I would like to rebuild the array. I am correct in saying [array release]? Will that release all the NSNumber objects? Or do I need to do more advance memory management, like set all objects to nil first?

Answer 1

You can either release the array and recreate it or—slightly more efficiently—just call the array’s -removeAllObjects. The NSNumber objects you’re populating it with are autoreleased, so the array, by taking ownership of them when you add them to it, also assumes responsibility for releasing them when it itself gets released or has its contents removed.

Answer 2

Your array will properly retain and release your NSNumbers as you add/replace and remove objects, as well as when you release the array holding the items. So yes you are correct since you are using the NSNumbers convenience constructor which will return an autoreleased object.