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Re: Fast dictionary with integer keys?

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Re: Fast dictionary with integer keys?

Subject: Re: Fast dictionary with integer keys?
From: Jean-Daniel Dupas <email@hidden>
Date: Sun, 15 Mar 2009 19:53:14 +0100


Le 15 mars 09 à 19:33, Oleg Krupnov a écrit :

I need to use a dictionary inside a long, time-consuming operation.
The keys of the dictionary are integers, the values are NSObjects.

I could use NSDictionary, but I don't like the overhead of creating
NSNumbers for the keys and then comparing them, where I could use
integers directly more efficiently, both by time and memory.

The question is: is there this kind of fast int-keyed dictionary in
Cocoa or elsewhere? Thanks!

You can either use an NSMapTable with NSIntegerMapKeyCallBacks or a CFDictionaryRef with NULL key callbacks.

In both case, you should use the C API and not use objc call, even if NSMapTable is a class in 10.5 and CFDictionary is tool free bridged. The bridge works only with CFDictionary initialized with Copy Key , CFType Value call backs.


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  >Fast dictionary with integer keys? (From: Oleg Krupnov <email@hidden>)




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