Re: Memory management with arrays

FROM : Scott Andrew
DATE : Sun Feb 10 14:36:25 2008

True.. (late night). So basically. Put a break in bar's dealloc. See 
were the extra dealloc is cooming from.

Scott

On Feb 9, 2008, at 10:38 PM, Bill Bumgarner wrote:

> On Feb 9, 2008, at 10:16 PM, Scott Andrew wrote:

>> Here is my guess, just because i hit this recently. It had to do 
>> with the [bar autorelease] call. This returns an autoreleased 
>> object. That may not be valid when you cam back around to 
>> removeAllObjects. Try the following:
>>
>> void foo
>> {
>>     [array removeAllObjects];
>>
>>     Bar* bar = [[Bar alloc] init];
>>     [array addObject:bar];
>>     [bar release];
>> }
>>
>> the following should also work..
>>
>> void foo
>> {
>>     [array removeAllObjects];
>>     
>>     Bar* bar = [[[Bar alloc] init] autorelease];
>>     
>>     [array addObject:bar];

>
> The OP's code, as posted, was fine.  -autorelease returns the 
> object being autoreleased and alloc returns an object that has been 
> retained.
>
> Most likely, OP has overreleased one of the objects in the array. 
> Run with NSZombieEnabled to see what object is being overreleased.   
> Better yet, turn on malloc stack logging (no compact) and use 
> malloc_history to see allocation events at that address.
>
> b.bum
>