Custom dealloc and ARC (Objective-C)

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When using ARC, you simply do not call [super dealloc] explicitly – the compiler handles it for you (as described in the Clang LLVM ARC document, chapter 7.1.2):

- (void) dealloc
{
    [observer unregisterObject:self];
    // [super dealloc]; //(provided by the compiler)
}

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