Re: Using indexes [Solaris 2.6, Swarm 1.2]

[Michael Whidden]

I avoid the 'atOffset' loop, because a quick look at the
code (I use Swarm 1.1) shows that it is very inefficient in a loop.
(It allocs memory, scans the whole list up to offset 'i', and then
releases the memory.)
An index loop is much faster.  Try one of the latter two.

Gary Polhill wrote:
> statically typing lp3 to LandParcel? Does anyone have any thoughts
> on what the best way to traverse a list is? Or any thoughts on which
> is better (in terms of efficiency/elegance/readability) of the
> following:
> 
> for(i = 0; i < [aList getCount]; i++) {
>     member = [aList atOffset: i];
> 
>     // do your stuff
> }
> 
> for(anIndex = [aList begin: aZone], [anIndex next];
>     [anIndex getLoc] == Member;
>     [anIndex next])
> {
>     member = [anIndex get];
> 
>     // do your stuff
> }
> 
> Of course, if there is no bug in -next, then you could do:
> 
> for(anIndex = [aList begin: aZone], member = [anIndex next];
>     [anIndex getLoc == Member;
>     member = [anIndex next])
> {
>     // do your stuff
> }

-- 
 Michael Whidden                   Lockheed Martin Information Systems
 Phone: (781) 505-9542             Advanced Simulation Center
 Fax:   (781) 505-9501             37 North Ave
 Email: address@hidden  Burlington, MA 01803

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