Re: Leopard Properties and NSMutable Array

FROM : Jonathan Dann
DATE : Sun Jan 06 03:13:01 2008

Thanks alot!  Thought my inexperience was rearing its ugly head.

Much appreciated

On 6 Jan 2008, at 01:53, Bill Bumgarner wrote:

> On Jan 5, 2008, at 5:41 PM, Jonathan wrote:

>> self. content = [[NSMutableArray alloc] init];
>> [self. content addObject:[NSString string];
>>
>> But I get the an error that tells me that I'm trying to mutate an 
>> immutable collection.  Why is this, is the setter calling a -copy 
>> method which returns an immutable copy? If so, why have this 
>> behaviour?

>
> That is because the synthesized method sends -copy to the mutable 
> array, yielding an immutable array.
>

>> Which argument to the @property directive would give the same as
>>
>> - (void)setContent:(NSArray *)newArray;
>> {
>>     if(content != newArray) {
>>         [content release];
>>         content = [[NSMutableArray alloc] initWithArray:newArray];
>>     }
>> }

>
> Which, unfortunately, is the alternative.  There is an enhancement 
> request already to offer a mutablecopy keyword.
>
> b.bum