Re: Implementing fast enumeration

FROM : Thomas Backman
DATE : Sat May 03 15:10:56 2008

Hmm, your previous message/thread made it and has two answers.

Regards,
Thomas

On May 2, 2008, at 10:41 AM, Ben wrote:

> I have been reading the documentation for implementing the 
> NSFastEnumeration protocol and am having some difficulties following 
> it.
>
> For completeness, here is the protocol method:
> - (NSUInteger)countByEnumeratingWithState:(NSFastEnumerationState 
> *)state objects:(id *)stackbuf count:(NSUInteger)len;
>
> typedef struct {
> unsigned long state;
> id *itemsPtr;
> unsigned long *mutationsPtr;
> unsigned long extra[5]; } NSFastEnumerationState;
>
> I have a C array where the elements within it can be converted into 
> multiple objects. Say I have 5 objects. Do I provide them all in one 
> go and return the total number? Or just one per call and return the 
> number remaining?
>
> Also, should the objects be returned by reference in the stackbuf 
> variable, or in the itemsPtr field of the state structure?
>
> Apologies if these are basic questions, but I got decidedly lost 
> trying to follow the docs.
>
> Ben.
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