Use of a int type property

FROM : Davide Benini
DATE : Sat Mar 29 20:15:36 2008

In a previous conversation I realised that I can use any tipe as a 
property. As a consequence, I decided to use a simple int type for a 
"repetitions" property of MyClass, instead of a NSNumber. I changed my 
code accordingly, but the changes generated a strange bug. As soon as 
I set my int property to a value, any value, the instance of MyClass 
becomes unusable. I  use the debugger to trace the bug, and realised 
that everything is allright, as long as I don't assign a value to 
"repetitions". So if I "po" an instance of MyClass I get a 
description, until I assign 1 to repetitions; later I can "po 
myInstance.key", but if I "po myInstance" i get:

"Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000001
0x92c0d6e4 in objc_msgSend ()
The program being debugged was signaled while in a function called 
from GDB.
GDB has restored the context to what it was before the call.
To change this behavior use "set unwindonsignal off"
Evaluation of the expression containing the function 
(_NSPrintForDebugger) will be abandoned."


Here is MyClass.h file

@interface MyClass : NSObject {
   int repetitions;
   NSMutableArray *body; // Il contenuto
   NSString *key;    // in questo modo posso determinare cambi di chiave!
}

@property int repetitions;
@property (nonatomic, retain) NSMutableArray *body;
@property (nonatomic, retain) NSString *key;

and here the MyClass.m file

#import "MyClass.h"

@implementation DBNMusicBlock

@synthesize body;
@synthesize key;
@synthesize repetitions;

- (void) dealloc
{
   [variantEnding release];
   [body release];
   [super dealloc];
}
- (id) init
{
   self = [super init];
   if (self != nil) {
       
       body = [[NSMutableArray alloc] init];
       repetitions = 1; // if I comment this line, the instance is allright 
as long as I don't assign a value to this property
   }
   return self;
}

What is wrong with this code?
Any idea?
Thanks in advance,
Davide