Re: autorelease - when is retain count decremented
Re: autorelease - when is retain count decremented
- Subject: Re: autorelease - when is retain count decremented
- From: j o a r <email@hidden>
- Date: Tue, 14 Sep 2004 23:32:53 +0200
My advice is that you should avoid to think about memory and pointers
when you work in Cocoa. Think objects, and references to objects.
NSString *aString = [NSString string];
Now you have a reference to a string object. The string object was
created from a class factory method, and you are therefore not required
to think about when or how to release it - as you don't retain it.
aString = [NSString string];
Now you have a reference to another string object. You no longer have a
reference to the first string object, but from a memory management
perspective it doesn't matter - as it was autoreleased there is no
memory leak.
Autoreleased objects are released when the autorelease pool that have a
reference to them is itself released. This *usually* happens at the end
of the "event loop", ie. at the end of the chain of events that is
triggered by for example a mouse click or a key press by the user.
Use Google and the mailing list archives help you find all the nice
articles written on Cocoa memory management that are available on the
web!
j o a r
On 2004-09-14, at 22.41, justin webster wrote:
just wondering what causes the retain count of an object to drop.
this is the situation I've been wondering about:
NSString *myString = [NSString stringWithFormat:@"testing"];
myString = anotherString;
when I point myString away from the 'testing' string, does the
'testing' memory get freed?
or should I release myString before pointing it to something else?
also, in this situation do I now have two pointers to the same piece
of memory, and therefore a retain count of two?
Attachment:
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden