retainCount start from 2 !!!

[jockerfox]

Hi to all!

On 17.1 you wrote numberWithInt:100  hehe..
Why if I write numberWithInt:10, the retainCount is 2 ?  START from 2?!?

Test 1:

Code: (Objective-C)

#import <Foundation/Foundation.h>
 
int main(int argc, char *argv[])
{
    NSAutoreleasePool *pool=[[NSAutoreleasePool alloc]init];
    NSNumber *myObject=[NSNumber numberWithInt:10];
    NSLog(@"retainCount di myObject:%i", [myObject retainCount]);
    [pool drain];
    return 0;
}

OUTPUT
2009-03-18 19:20:44.213 esempioStringXForum[32017:10b] retainCount di myObject:2

But now.. triple 
Test 2:

Code: (Objective-C)

#import <Foundation/Foundation.h>
 
#define NUMERO 0xF
int main(int argc, char *argv[])
{
    NSAutoreleasePool *pool=[[NSAutoreleasePool alloc]init];
    int i;
   
    for (i=NUMERO; i>0; i--)
    {
        NSNumber *myObject=[NSNumber numberWithInt:i];
        if ([myObject retainCount]!=1)
            printf("%i - retainCount di myObject:%i\n", i, [myObject retainCount]);
    }
    printf("i==0 ? >>> %i\n\n",i);
 
    for (i=-NUMERO; i<0; i++)
    {
        NSNumber *myObject=[NSNumber numberWithInt:i];
        if ([myObject retainCount]!=1)
            printf("%i - retainCount di myObject:%i\n", i, [myObject retainCount]);
    }
    printf("i==0 ? >>> %i\n\n",i);
 
//*****************************************************************************
//*****************************************************************************
    printf("***************************************\n");
    NSNumber *myObject2=[NSNumber numberWithInt:10];
    printf("retainCount di myObject2:%i\n", [myObject2 retainCount]);
 
    [pool drain];
    return 0;
}

OUTPUT
12 - retainCount di myObject:2
11 - retainCount di myObject:2
10 - retainCount di myObject:2
9 - retainCount di myObject:2
8 - retainCount di myObject:2
7 - retainCount di myObject:2
6 - retainCount di myObject:2
5 - retainCount di myObject:2
4 - retainCount di myObject:2
3 - retainCount di myObject:2
2 - retainCount di myObject:2
1 - retainCount di myObject:2
i==0 ? >>> 0

-1 - retainCount di myObject:2
i==0 ? >>> 0

***************************************
retainCount di myObject2:3

I'm confused...?? 
Regards.. and thank you!

[skochan]

I don't blame you for being confused!   

Check here for a detailed discussion on this:

http://classroomm.com/objective-c/index.php?topic=188.0

Cheers,

Steve Kochan

[jockerfox]

Thanks for the quick response!
And thanks for your reply.

I linked this topic on XCode-Italia, ok? 
LINK:http://www.xcodeitalia.com/forum/viewtopic.php?t=1967

to the next.. 

[skochan]

Sure it's ok!   

Cheers,

Steve