Re: NSArray - waste of time?
Re: NSArray - waste of time?
- Subject: Re: NSArray - waste of time?
- From: Philippe Mougin <email@hidden>
- Date: Thu, 26 Apr 2007 23:51:24 +0200
Le 26 avr. 07 à 23:36, John Stiles a écrit :
This is a bit confusing to me--the implementation of NSArray is
inside the OS, right? So what do you mean by this? Do you have a
custom subclass or something?
Yes. NSArray is semi-abstract, and is consequently always used
through a concrete subclass. Cocoa provides default implementations
(the most common is NSCFArray these days) but you can as well use
your own concrete subclass. This is what we do in F-Script.
Philippe Mougin
Sent: Thu 4/26/2007 2:33 PM
To: email@hidden
Subject: Re: NSArray - waste of time?
> There is also the footprint to consider, surely?
> A C-style array is likely to be much smaller than
> an NSArray of objects, particularly in the case of
> primitive data types such as floats vs NSNumber objects.
It depends how the NSArrays you deal with are implemented (remember
that NSArray is a class cluster -- in other words, a semi-abstract
class). For instance, in F-Script we make extensive usage of NSArrays
(in particular arrays of NSNumbers), but we do so using an
implementation that transparently make them as small and as fast as C-
style arrays, in most cases.
Philippe Mougin
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