Re: Hash Values in Custom Classes
Re: Hash Values in Custom Classes
- Subject: Re: Hash Values in Custom Classes
- From: Sean McBride <email@hidden>
- Date: Mon, 28 Mar 2011 14:06:55 -0400
- Organization: Rogue Research Inc.
On Sat, 26 Mar 2011 02:23:42 +0100, Peter Lübke said:
>To be more detailed: my custom class and its subclasses are wrapper
>classes containing file informations. They are based on FSRef rather
>than using paths - I do a lot of lengthy iterations so paths are much
>too fragile. I also heavily use NSSet to store instances, and I
>wanted -isEqual: to be as fast as possible. So I thought I could just
>return a unique hash value for each custom class and return
>(FSCompareFSRefs (&ownRef, &otherRef) == noErr) for -isEqual:, thus
>avoiding the need to *first* compare the objects' classes.
Are you aware that starting in 10.6, the OS provides 'file reference
URLs' which are much like FSRefs. See:
<http://developer.apple.com/library/mac/#releasenotes/Cocoa/Foundation.html>
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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