cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   hanstar17
   Member

   I have a class called NSMyNumber.(if you want to see why I did it, http://www.cocos2d-iphone.org/forum/topic/1481 )
   The source code is the following:

   @implementation NSMyNumber

   @synthesize intValue;

   +(id) numberWithInt:(int) _value
   {
   return [[self alloc] initWithInt:_value];
   }

   - (id) initWithInt:(int) _value
   {
   if(self = [super init])
   {
   intValue = _value;
   }
   return self;
   }

   @end

   This program has any problem except for one thing. It runs, doesn't crash, but is going to keep leaking memory since I'm not autoreleasing the momory allocated in numberWithint function. However, my game crashes if I add autorelease code there like CocosNode: return[[[self alloc] initWithInt:_value]autorelease];

   New questions : Why does it crash?
   Exception is BAD_ACCESS and function call hierarchy is the following:
   0 objc_msgSend
   1 NSPopAutoreleasePool
   2 _UIApplicationHandleEvent
   3 PurpleEventCallback
   ....
   ....

   But my code is almost identical to CocosNode?..

   Posted 2 years ago #
2. 

   natanavra
   Member

   Why not release is it sometime later?

   NSMyNumber *num = [NSMyNumber numberWithInt: 20];
   
   --------
   //Sometime later in your code...
   
   [num release];

   BTW, why not use the NSNumber class????

   Posted 2 years ago #
3. 

   hanstar17
   Member

   Follow the link on the first thread, then you will see ;) For some reason I gets error.

   But I'm not sure now. I had had another error when I tried autorelease with NSMyNumber, but I fixed the bug, but didn't try with NSNumber. It may work now.

   Posted 2 years ago #
4. 

   natanavra
   Member

   NSNumber class is a really useful class, I suggest you read about it. It does what you are trying to achieve and more. It's a class that creates an object that contains numbers, and stuff... So as an object, you can store it inside an Array...

   Read up in the docs, some interesting stuff there.

   Posted 2 years ago #
5. 

   hanstar17
   Member

   Well, I don't see why it is really useful though. Would you explain why? It just seems to me a normal integer that makes operations way more difficult. Even you can't change the value easily because it's immutable, but maybe I'm missing something. If I could use int in NSArray, I would have used normal int type with my knowledge.

   Posted 2 years ago #
6. 

   natanavra
   Member

   You want to store integer types in an array??
   This is what I would do :

   NSNumber *num = [NSNumber numberWithInteger: 20];
   [myArray addObject:num];

   NOTE: the function mentioned above using NSNumber will return an autoreleased object, and it is an object so it can be stored in an array...

   Posted 2 years ago #

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