Question

I’m still trying to wrap my head around iphone memory management. I have checked this with leaks but I want to make sure. Is this free of leaks?

NSMutableArray *array = [[NSMUtableArray alloc] init];
NSMutableString *str = [[NSMutableString alloc]];

[str appendstring:@"hi"];

[array addObject:str];

[str release]; //this is the bit I am most concerned about


...some processing of array occurs...

[array release];

Answer 1

Assuming your second line is actually this:

NSMutableString *str = [[NSMutableString alloc] init];

Then yes, this is free of leaks. When you add the string to the array, the array takes an ownership interest in the string, so the subsequent statement where you release your ownership of it is fine. It still exists in the array as expected.

When you release the array, it will take care of cleaning up its own references, including the one pointing to the string you put in it.