Question

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

• does addObject copy the pointers?
• do I have to retain the objects ?
• do I have to make a for and release each object then the array?

Answer 1

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.