I wrote a -deepCopy method as part of a protocol on the common collection classes. It does a respondsToSelector: and calls -copy if it doesn't. So as long as my collection views cover all collection classes to create a new NSArray etc. containing copies of the same objects, it mostly works. Downsides: This will make immutable copies of mutable objects (if you called -mutableCopy where available, you might do the reverse), and you need to be careful that you don't miss adding -deepCopy to a class.
Cheers, -- Uli Kusterer "The Witnesses of TeachText are everywhere..." http://www.zathras.de On Feb 14, 2013, at 3:07 AM, James Maxwell <jbmaxw...@rubato-music.com> wrote: > I've run into a situation where I really need a deep copy of an object. I've > implemented this using Apple's recommended approach with > NSKeyedArchiver/Unarchiver, and it's nice, simple, and functional. But it's > also pretty darn slow -- as in a clear, subjectively apparent performance hit. > Has anybody had to find a way around this, and if so, what did you do? Or if > anybody just has a nice, creative thought about another way of doing it, I'd > love to hear about it. > > The object(s) being copied are custom classes, and there's a chance I may be > able to get away with copying only certain properties (i.e., rather than > archiving the entire graph from the root object), so I'll look into making a > "deepCopy" method that's more selective. But I'd appreciate any thoughts in > the meantime. > > Thanks in advance. > > J. > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > 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/witness.of.teachtext%40gmx.net > > This email sent to witness.of.teacht...@gmx.net _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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 arch...@mail-archive.com
