automatic-ref-counting

In Clang's Objective-C Automatic Reference Counting we see the following For __weak objects, the lvalue is updated to point to the new pointee, unless the new pointee is an object currently undergoing deallocation, in which case the lvalue is updated to a null pointer. This must execute atomically with respect to other assignments to the object, to reads from the object, and to the final release of the new pointee. In objc-weak.mm wee see the following chunk of code in weak_register_no_lock() : if (deallocating) { if (crashIfDeallocating) { _objc_fatal("Cannot form weak reference to instance (

Actually i came to this question when i was trying to add some classes that have been made upon ios prior to IOS 5 and these classes doesn't having ARC and the project i am trying to add is made upon the IOS 5 and it give me the compile time error related to ARC the classes having suck kind of information that if i try to remove the release/retain then it start behaving irregular.That is my problem, Now come to question i want to know that is there any way so that i can mark those classes not to use ARC so that the newly created classes that having base SDK ios5 compile with ARC and i mention

I'm pretty new to Objective-C, as you may gather, and until recently, I hadn't really understood the need for all this AutoRelease malarky. I think that's mostly because I've started Objective-C with ARC, and haven't had any exposure to doing retains and release. Anyway, my understanding now is that pre-ARC, if you created an object and needed to return a pointer to it as the returning object of the method/function, you would need to autorelease it, because you are unable to do the "[obj release]" after doing "return obj;" Worrying about retains and releases isn't an issue with ARC. Does this

ARC is enabled and bufferReady is being triggered by a C++ library(non-ARC enabled), and I'm sure I'm missing an ARC cast somewhere. Please advise. Thanks in advance. With the code below: @implementation HelloWorldLayer id refToSelf; //reference to self int shakeCounter = 0; void bufferReady() { if (shakeCounter % 100 == 0) { [refToSelf shakes]; } shakeCounter++; } - (void) shakes { CCRotateBy * rotate = [CCRotateBy actionWithDuration:0.1 angle:2]; CCActionInterval * rotateReverse = [rotate reverse]; CCSequence * seq1 = [CCSequence actions:rotate, rotateReverse, nil]; CCMoveBy * shake =

I am using the GData static library in my app that uses ARC. Google's instructions say to link the header files from the library to the project target. The problem is that when I do so I get compiler errors as the GData library is not compatible with ARC. Google states that: ARC Compatibility When the library source files are compiled directly into a project that uses ARC, then ARC must be disabled specifically for the library sources. To disable ARC for source files in Xcode 4, select the project and the target in Xcode. Under the target "Build Phases" tab, expand the Compile Sources build