Making a removeAll method, need help

[tanakasan1734]

Hi,

I'm trying to add to ex15.6 by making a removeAll method. Would the short method below work for this? I ask because when I call the list method on the book after I have apparently release all the address card objects the list shows up fine.

Code: (Objective-C)

-(void) removeAll {
	for(AddressCard *nextCard in book) {
		[nextCard dealloc];
	}
}

I've tried running the code with the leaks instrument but I'm not sure how to interpret it.

Thanks for any help

Simon

[rgronlie]

Simon,

Never call dealloc directly (the exception would be [super dealloc] when overriding the dealloc method).

To remove all address cards from the address book all you need to do is:

Code: (Objective-C)

[book removeAllObjects];

Ryan

[tanakasan1734]

Hi Ryan,

Thanks for the reply, and for pointing out dealloc (it was originally release but I changed it while playing around with Leaks).

So am I correct in thinking that this will release the memory used for the address cards as well?

I learnt C before jumping straight to Obj C so in my mind I'm used to having to explicitly release everything I allocate... I'm guessing I have to loose this mentality?

Thanks again

Simon

[rgronlie]

Simon,

So am I correct in thinking that this will release the memory used for the address cards as well?

This will reduce the retain count by one. The memory won't be released until the retain count is zero.

When you added the cards to the book their retain counts were increased by one. Since you most likely allocated the memory for the cards yourself i.e. [AddressCard alloc] you are still responsible for sending another release message to the card.

Ryan