Re: NSDictionary and retaining values

Subject: Re: NSDictionary and retaining values

From: "stephen joseph butler" <email@hidden>

Date: Fri, 18 Apr 2008 13:06:18 -0500

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On Fri, Apr 18, 2008 at 12:58 PM, Optical Ali <email@hidden> wrote:

int main(int argc, char *argv[])

{

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

NSMutableArray *kArr = [NSMutableArray arrayWithObjects:@"1", @"2", @"3", @"4", nil];

NSMutableArray *aArr = [NSMutableArray arrayWithObjects:@"2", nil];

NSDictionary *aDic = [NSDictionary dictionaryWithObjectsAndKeys:

@"K", kArr, @"A", aArr, nil];

I think you're doing this backwards. It's "ObjectsAndKeys", not "KeysAndObjects".

int n = [kArr retainCount];

// Shouldn't n be 2 here?

[pool release];

return 0;

}

The #1 rule is that you cannot infer anything from the retain count. It's is for the system's use, not yours.

In this case, kArr is a key in the dictionary, so NSDictionary makes a copy (because keys must be immutable). So the retain count doesn't change.

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References:

>NSDictionary and retaining values (From: "Optical Ali" <email@hidden>)