CODEWITHSUNDEEP
iphoneobjective-creleasensmutabledictionaryautorelease
PartySoft
PartySoft

Reputation: 2839

what happends with the memory of the objects used in NSMutableDictionary when releasing the array?

I'm curious what happens with the memory of the objects that I push with [array addObject:object] when I use [array release]

Upvotes: 0

Views: 69

Answers (4)

PengOne
PengOne

Reputation: 48398

When you call 

[array addObject:object]

array retains object, thereby incrementing its retain count.

Later, when array is sent the message dealloc, it calls release on object.

To avoid memory leaks, you may have to release object after you add it to the array, e.g.

NSObject *object = [[NSObject] alloc] init];
[array addObject:object];
[object release];

Make sure you review the Memory Management Programming Guide to be certain that you are not over or under releasing object.

Upvotes: 1

5StringRyan
5StringRyan

Reputation: 3634

When you do [array addObject: object], the array is retaining the object that is inserted into the array. To avoid memory leaks, don't forget to release the original object that was inserted, or else the object being inserted into the array will have a retain count of 2 instead of 1:

SomeClassObject *obj = [[SomeClassObject alloc] init];
[array addObject:obj];
[obj release];

Since the array owns the objects that are inside of the array (holds a pointer to that object and did a retain as explained previously), when you release the array, the array knows to release any objects that are inside of it. The work is done for you!

Upvotes: 1

Bourne
Bourne

Reputation: 10312

addObject does a retain on that object you add. And when you release the array it automatically calls release on all objects it holds.

Upvotes: 1

Paul Lynch
Paul Lynch

Reputation: 19789

NSArrays retain added objects, so you don't have to add extra retains yourself, and can just release the array when done.

Upvotes: 0

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