weak-references

I was wondering if there was an easy way (or at least a way) to find out where retain cycles exist in your program. Also, if I then know where these retain cycles exist, depending on their types (e.g. variable or closure), how do I make them weak. I need to stop all retain cycles with self (my GameScene) so that it deallocates when I don't need it anymore and I want to restart it. Any tips, advice, answers, and feedback would be greatly appreciated (and providing specific code and examples would be preferred). Thank you. Edit: @Sweeper's answer was just what I was looking for. If you're having

I'm reading about WeakReference in wikipedia and I saw this code public class ReferenceTest { public static void main(String[] args) throws InterruptedException { WeakReference r = new WeakReference(new String("I'm here")); WeakReference sr = new WeakReference("I'm here"); System.out.println("before gc: r=" + r.get() + ", static=" + sr.get()); System.gc(); Thread.sleep(100); // only r.get() becomes null System.out.println("after gc: r=" + r.get() + ", static=" + sr.get()); } } When It runs this is the result before gc: r=I'm here, static=I'm here after gc: r=null, static=I'm here sr and r

Hi I have code here where I don't understand why I hit the breakpoint (see comment). Is this a Microsoft bug of something I don't know or I don't understand properly ? The code was tested in Debug but I think it should not changes anything. Note: You can test the code directly in a console app. JUST FOR INFORMATION... following supercat answer, I fixed my code with proposed solution and it works nicely :-) !!! The bad thing is the usage of a static dict and the performance the goes with it but it works. ... After few minutes, I realized that SuperCat give me all hints to do it better, to

I have a test that I expected to pass but the behavior of the Garbage Collector is not as I presumed: [Test] public void WeakReferenceTest2() { var obj = new object(); var wRef = new WeakReference(obj); wRef.IsAlive.Should().BeTrue(); //passes GC.Collect(); wRef.IsAlive.Should().BeTrue(); //passes obj = null; GC.Collect(); wRef.IsAlive.Should().BeFalse(); //fails } In this example the obj object should be GC'd and therefore I would expect the WeakReference.IsAlive property to return false . It seems that because the obj variable was declared in the same scope as the GC.Collect it is not being

If I have a closure passed to a function like this: someFunctionWithTrailingClosure { [weak self] in anotherFunctionWithTrailingClosure { [weak self] in self?.doSomething() } } If I declare self as [weak self] in someFunctionWithTrailingClosure 's capture list without redeclaring it as weak again in the capture list of anotherFunctionWithTrailingClosure self is already becoming an Optional type but is it also becoming a weak reference as well? Thanks! The [weak self] in anotherFunctionWithTrailingClosure is not needed. You can empirically test this: class Experiment { func

Where can I find good implementation of IDictionary which uses weak references inside? Dictionary should be holding only weak references to values and eventually clean up itself of dead references. Or should I just write it myself? ConditionalWeakTable Class uses weak keys and automatically removes the key/value entry as soon as no other references to a key exist outside the table. Paul Alexander You'll need to write it yourself. It should be relatively straight forward, implementing the IDictionary interface and then storing the actual values as WeakReferences. You can then check the values