Re: Efficiently adding a bunch of items to an NSMutableArray
Re: Efficiently adding a bunch of items to an NSMutableArray
- Subject: Re: Efficiently adding a bunch of items to an NSMutableArray
- From: Jean-Daniel Dupas <email@hidden>
- Date: Wed, 22 Sep 2010 14:55:23 +0200
Le 22 sept. 2010 à 14:46, Oleg Krupnov a écrit :
> Hi,
>
> I have a NSMutableArray and need to add a number of elements to it,
> and their quantity I know in advance (in fact, they come from another
> array).
>
> I think that if I add them one-by-one in a loop, the array will have
> to reallocate its internal memory frequently. This seems inefficient.
>
> I'd like to avoid this and instead have the array to re-allocate its
> memory only once to increment the capacity by the known value.
>
> I could use "arrayWithCapacity" creation method, but the array already
> exists. It seems that the -addObjectsFromArray: method may be what I
> need, but the docs do not make it clear if it's internally optimized
> to do only a single memory re-allocation. Have anyone tested this?
Is this part of your code a bottleneck ? If not, use the simplest way (-addObjectsFromArray:) and don't bother with premature optimization.
-- Jean-Daniel
_______________________________________________
Cocoa-dev mailing list (email@hidden)
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:
This email sent to email@hidden