CODEWITHSUNDEEP
iphoneobjective-ciosmemory
vburojevic
vburojevic

Reputation: 1666

iPhone memory management

I don't understand this exactly.

if I write:

NSNumber *number = [NSNumber initWithInteger: 5];

do I have to release it?

Is this the same as: NSNumber *number= [NSNumber alloc];

?

Upvotes: 1

Views: 200

Answers (3)

MonkeyBusiness
MonkeyBusiness

Reputation: 111

"The general rule of thumb is: If you alloc, copy, or new, memory management's on you."

I'd add retain to this as well.

Upvotes: 2

EmptyStack
EmptyStack

Reputation: 51374

First of all, there is no class method named "+(id)initWithInteger:" in NSNumber class. That should be "+(id)numberWithInteger:"

You should not release it. Constructors like "[NSNumber numberWith..." are called convenient constructors. They return autoreleased objects. So, you don't have to worry about releasing them.

Upvotes: 0

Nate Thorn
Nate Thorn

Reputation: 2183

You wouldn't call NSNumber *number = [NSNumber initWithInteger: 5]; because NSNumber does not respond to + initWithInteger:. You actually need to call both +alloc and -initWithInteger:, like this:

NSNumber *number = [[NSNumber alloc] initWithInteger:5];

Then you will have to release it later; for every alloc call you make, you should also make a call to release.

Alternatively, you could get an autoreleased NSNumber using the following class method:

NSNumber *number = [NSNumber numberWithInteger:5];

Methods like this return an autoreleased object, which means that you do not need to release it yourself later.

Upvotes: 5

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