Question

I’ve seen in (Apple) sample code two types of ways of allocation memory, and am not sure I understand the difference and resulting behavior.

// FAILS
NSMutableArray *anArray = [NSMutableArray array];
[anArray release];

// WORKS
NSMutableArray *anArray1 = [[NSMutableArray alloc] init];
[anArray release];

By “FAILS” I mean I get crashes/runtime warnings etc., and not always as soon as I call the release…

Any explanation appreciated.

Thanks

Answer 1

Please keep in mind that

NSMutableArray *anArray = [NSMutableArray array];

acts like:

NSMutableArray *anArray1 = [[[NSMutableArray alloc] init] autorelease];

So doing a release again will cause the crash as you are trying to release an autoreleased object.

Hope this helps you.

Thanks,

Madhup