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Editorial Team
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Asked: 2026-05-26T08:31:59+00:00

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; myClass *obj = [[myClass alloc] init]; NSArray *ar

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NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

myClass *obj = [[myClass alloc] init];

NSArray *ar = [NSArray array];

[ar addObject: obj];

[ar removeObject: obj];

[pool drain];

Will removing an object from an NSArray array automatically release its memory that I have earlier allocated?? The answer seems to be yes from what I have found from various sources. The problem is if I test for memory leaks, xcode still complains that obj has not been released. So what’s actually going on?

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1 Answer

  1. Editorial Team

    Yes. When you insert an object into an array, the array retains it (bumps its retain count). If the object’s retain count is 1 (ie, there are no other retains on it) then when it’s removed from the array the retain count goes to zero and it’s eligible to be deleted.

    But your problem in the above scenario is that, after adding the object to the array, you failed to release YOUR retain on the object (due to the alloc/init). Insert [obj release] after the [ar addObject:obj].

    (Also note that in your example the entire array will go “poof” when you drain your autorelease pool.)

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