Re: NSPredicate predicateWithFormat:
Re: NSPredicate predicateWithFormat:
- Subject: Re: NSPredicate predicateWithFormat:
- From: Keary Suska <email@hidden>
- Date: Fri, 24 Oct 2008 13:30:29 -0600
On Oct 23, 2008, at 1:03 PM, chaitanya pandit wrote:
Well i could not find any explicit explicit alloc/init method for
predicate, I am using Instruments to check for memory leaks, and it
shows a memory leak with the array.
You would use NSComparisonPredicate for explicit creation. Anyway,
just because instruments says there is a leak, doesn't mean there
really is a leak. It just thinks there *might* be a leak. Use object
allocations to watch namesArray, and I bet you will see it being
deallocated nice and neat. If not, then it means you aren't showing us
all of the relevant code.
On 23-Oct-08, at 11:33 PM, Keary Suska wrote:
On Oct 23, 2008, at 11:05 AM, chaitanya pandit wrote:
NSArray *namesArray = [NSArray arrayWithObjects:@"Tom" ,
@"Matt" , @"Joe", nil];
NSPredicate *predicate = [NSPredicate predicateWithFormat: @"Name
IN %@", namesArray];
NSMutableArray *foundNames = [[arrayController
arrangedObjects]filteredArrayUsingPredicate:predicate];
It works but he problem is that i have a memory leak over here,
before creating the predicate, the retain count of namesArray is
1, but after i create the predicate it is 2 and in instruments i
see a memory leak with the namesArray.
There is no memory leak in the code you provided. Everything is
autoreleased, and should be deallocated when the pool is drained.
The NSPredicate is probably retaining its arguments, and it should
release them when itself is released.
To check this, use alloc/init for the predicate and explicitly
release it before re-checking the retain count.
Anyway, you shouldn't rely on retain count for memory-related
issues, as you now see.
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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