On Sep 16, 2008, at 20:59 , Dave DeLong wrote:
The general rule with convenience class methods like that is that they return an autoreleased object. What that means is that unless you retain it, it will disappear at some time in the future (whenever the current AutoreleasePool gets drained).
Yes, as Dave says, convenience methods like [NSMutableString string] get autoreleased, so you don't have to do anything at all to reclaim the memory, but you do have to make sure you retain the string if you want it to persist anywhere outside it's current function/method scope. (BTW, when I say this, it doesn't mean that the memory /will/ get freed when the function returns, just that you have no guarantee that the object is valid once the function returns--unless you retain it)
So if you want to "reclaim" the space, you don't have to do anything. If you want to reclaim it immediately, I think you ought to be able to do:NSString * str = [NSMutableString string]; //do stuff with str [[str retain] release];HOWEVER, that might cause funky things to happen with the autorelease pool. So the best idea is to do nothing and let the autorelease pool take care of it.
Don't do that... if you're working with a limited-memory environment, or you are creating a lot of objects, your best bet is to actively manage your memory. Create your mutable string with alloc/init and then release it when you're done:
NSMutableString *str = [[NSMutableString alloc] initWithCapacity:someAssumedCapacity];
/* do stuff */ [str release];Or, if you're creating lots of short-lived things in a loop or something, create your own autorelease pool:
while (loopConditionIsTrue) {
NSAutoreleasePool *myPool = [[NSAutoReleasePool alloc] init];
NSMutableString *str = [NSMutableString string];
/* do stuff */
[myPool drain]; // all your autorelease objects created within the
loop will be freed here
} /jason
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