Am I responsible for releasing this string, and is it autorelease by default? // command is of type NSData* char cAddress[12]; [command getBytes:cAddress range:NSMakeRange(5,12)]; NSString *someString = [NSString stringWithCharacters:(const unichar*)cAddress length:12]; ...
I'm learning Objective-C and I'm trying to write a Vector3D class. In C++ or Java the function I want to implement would look something like this: Vector3D { Vector3D crossProduct(Vector3D in) { Vector3D result; result = ... // maths involving this classes variables and the input Vectors variables. return result; } ...
In the developer documentation, it says: If your application or thread is long-lived and potentially generates a lot of autoreleased objects, you should periodically drain and create autorelease pools (like the Application Kit does on the main thread); otherwise, autoreleased objects accumulate and your memory footprint grows. If, howe...
How can I call SDL functions from C++ in OS X without a main method? I'm building a dynamic library that does the initialization. The application that calls it depends only on the library. I realize that I need to somehow create an autorelease pool in Objective-C, because SDL_Init() crashes as it's now, but I don't know how. SDLmain cre...
Here i used auto-release for 'tempString' in the method 'test'. According to the rule, i should use "[temp retain]" in the main . But i didnt use it. still it works fine and prints the output. Then what is the need of "retain"? Can anyone pls tell me the reason? Thanks in advance. -(NSMutableString *) test : (NSMutableString *) aString...
For reference, I've already read: http://stackoverflow.com/questions/2981374/memory-management-question-releasing-an-object-which-has-to-be-returned http://stackoverflow.com/questions/3835464/iphone-return-nsmutablearray-in-method-while-still-releasing http://stackoverflow.com/questions/1250651/releasing-objects-returned-by-method-in-o...
Hi, I'm still wrapping my head around some of the nuances of memory management in objective-C, and came up with the following case I'm unsure about: + (NSDecimalNumber*)factorial: (NSDecimalNumber *)l { NSDecimalNumber *index = l; NSDecimalNumber *running = [NSDecimalNumber one]; for (; [index intValue] > 1; index = [inde...
I archive an array (NSMutableArray) of custom objects that implement the . Once i load it froma file to a retaining property @property (nonatomic, retain) NSMutableArray *buddies; the release count of the object is 2 (correct, it's 1of autorelease + 1 of retain of the property) but then noone releases it and the retain count becames 1, ...
I have code similar to this in Objective-C: SubclassOfNSObject *GlobalVariableThatShouldNeverChange; @implementation MyClass +(void) initialize { [super initialize]; GlobalVariableThatShouldNeverChange = [[SubclassOfNSObject alloc] init]; // Change more stuff with GlobalVariableThatShouldNeverChange } @end I have this r...
Instruments leaks says that this code leaks: NSString *name = [file substringToIndex:i]; Layer *actualLayer = nil; for (Layer *lay in layers) { if ([lay.layerName isEqual:name]) { actualLayer = lay; } } name is the leaking object. There are some strange things: it only leaks sometimes, not always (this snippet of code ...
Dear all, I am using the XMLParser class, which contains an array with XMLElement objects. The XMLElement is being allocated using the autorelease operation. However, for some reason I'm getting a memory leak (using instruments) on this line: self.currentElement = [[[XMLElement alloc] init] autorelease]; I'm also releasing the XMLPar...
1) What is the reason for the use of retain? For example, in a setter method: - (void) setCount: (int) input { [intCount autorelease]; intCount = [input retain]; } 2) the autorelease-Method: Is it deleting an old object or preparing the new one? 3) Why the retain-method is called at the input-object? Would intCount = inpu...
I'm writing an NSArray category to include the -objectAtRandom message that returns an object from a random index (something similar to Python's choice). Should I autorelease this object before returning it? I believe I shouldn't, but I'm not sure... ...
I'm having difficulties to understand exactly WHEN autorelease pools are created and released in AppKit apps. For example, if I have an ApplicationController class that overrides init, is there an autorelease pool that gets created before it starts and gets drained after it ends? ...
Sometimes I wonder when something gets autoreleased. I added an NSLog in the dealloc of various objects, but I couldn't find anything useful. When does something release when autorelease is used? Is it unpredictable, or is there some extra thread running? Thanks. ...