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Re: faster deep copies?
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Re: faster deep copies?


  • Subject: Re: faster deep copies?
  • From: Tom Davie <email@hidden>
  • Date: Thu, 14 Feb 2013 14:39:13 +0000

On 14 Feb 2013, at 02:07, James Maxwell <email@hidden> 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.

One possible approach to this (though not one that's going to be as fast as a custom deepCopy method), would be to implement your own NSCoder subclass.  I have in the past made keyed archivers which are substantially quicker than apple's, and encode into substantially smaller byte formats.

Thanks

Tom Davie
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 >faster deep copies? (From: James Maxwell <email@hidden>)

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