Yes, [NSDate date] returns an autoreleased object. So you need to retain it if you want to use it later. Once you are done with it, you should release it. See: https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmRules.html#//apple_ref/doc/uid/20000994-SW6
If a Cocoa method name doesn't begin with “alloc”, “new”, “copy”, or “mutableCopy”, then the returned object is autoreleased. Dave On 2012-03-17, at 6:38 PM, G S wrote: > I have a member variable to hold an NSDate: > > NSDate* _firstBadAccuracyTime; > > At some point, something happens and I set this value to "now": > > _firstBadAccuracyTime = [NSDate date]; > > On my next trip through this function, I calculate how long it has been > since I set this date: > > NSDate* now = [NSDate date]; > if([now timeIntervalSinceDate:_firstBadAccuracyTime] > > BAD_ACCURACY_TIME) > > then CRASH: BAD ACCESS > > _firstBadAccuracyTime still contains a valid address, but the object > must've been released. Why? If I add a retain where I assign it, the > crash doesn't happen. I added autorelease, but then got a crash on > releasing an object I hadn't allocated (which makes me think it's already > autoreleased). > > Thanks for any insight! > > Gavin > _______________________________________________ > > Cocoa-dev mailing list ([email protected]) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/cocoa-dev/dave.fernandes%40utoronto.ca > > This email sent to [email protected] _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
