Roland's right about ARC, you just need the set and copy. Just for the record, 
I don't think the pattern you present is safe when newSelection equals 
mySelection (as you release before you copy), you need something like one of 
the following:

if (mySelection != newSelection)
{
        [mySelection release];
        mySelection = [newSelection copy];
}

OR

[mySelection autorelease];
mySelection = [newSelection copy];

OR

oldSelection = mySelection;
mySelection = [newSelection copy];
[oldSelection release];

Aaron

On May 7, 2012, at 8:38 PM, Koen van der Drift wrote:

> 
> On May 7, 2012, at 11:28 PM, Roland King wrote:
> 
>> -(void)setMySelection:(NSArray*)newSelection
>> {
>>              // set whatever instance variable you have for mySelection, 
>> with appropriate memory management if necessary
> 
> 
> I thought about that too, but how do I do that when using ARC? Can I still do 
> this:
> 
> [mySelection release];
> [mySelection = [newSelection copy]];
> 
> or something along those lines?
> 
> - Koen.
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