NSMutableArray EXEC_BAD_ACCESS on initWithObjects

Question

Is the following legal in Objective-c with ARC enabled?

NSMutableArray * smallArray = [[NSMutableArray alloc] initWithObjects:@"1", @"2", @"3", nil];
smallArray = [[NSMutableArray alloc] initWithObjects:@"4", "5", nil];

I thought it should be. However, in this situation it gives me EXEC_BAD_ACCESS on the forth line:

NSMutableArray * bigArray = [[NSMutableArray alloc] init];
NSMutableArray * smallArray = [[NSMutableArray alloc] initWithObjects:@"1", @"2", @"3", nil];
[bigArray addObject: smallArray];
smallArray = [[NSMutableArray alloc] initWithObjects:@"4", "5", nil];

addObject copies the pointer right? So if I allocate a new segment of memory to smallArray to point to, what is wrong with that?

However this code segment does not crash:

NSMutableArray * bigArray = [[NSMutableArray alloc] init];
NSMutableArray * smallArray = [[NSMutableArray alloc] initWithObjects:@"1", @"2", @"3", nil];
[bigArray addObject: smallArray];
smallArray = [[NSMutableArray alloc] init];
[smallArray addObject:@"4"];
[smallArray addObject:@"5"];

What's going on here?

Not very clear about this, but I happened to see initWithObjects:@"4", "5", nil]... have you lost @ before "5"?? — Kjuly
– Kjuly, Commented Jul 18, 2012 at 14:20

Conner · Accepted Answer · 2012-07-18 18:02:50Z

2

Try this:

smallArray = [[NSMutableArray alloc] initWithObjects:@"4", "5", nil];

The second object must be @"5", not just "5".

edited Jul 18, 2012 at 18:02

Conner

31.4k8 gold badges55 silver badges75 bronze badges

answered Jul 18, 2012 at 14:20

Martin R

541k98 gold badges1.3k silver badges1.4k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

codingFriend1 · Accepted Answer · 2012-07-18 14:22:03Z

0

I guess this is because you forgot the @ in the string "5". it should be:

smallArray = [[NSMutableArray alloc] initWithObjects:@"4", @"5", nil];

answered Jul 18, 2012 at 14:22

codingFriend1

6,9358 gold badges51 silver badges69 bronze badges

Collectives™ on Stack Overflow

NSMutableArray EXEC_BAD_ACCESS on initWithObjects

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related