Millistes olukordades võib viitearvuti kasutamine mälu haldamiseks mitte suurendada objekti arvu?

Reference counting (reference counting) usage does not increase the counter in the following situations:

• Weak references: they do not increase the counter to avoid cyclic dependencies. For example, in iOS with ARC, weak references are declared with weak.
• Unowned references: similar to weak, but assume the object always exists and also do not increase the counter.
• Internal compiler or runtime optimizations: sometimes, references can be optimized so that the counter does not change.

Example of a weak reference in Swift:

class Person {
    var name: String
    weak var apartment: Apartment? // does not increase the counter
    init(name: String) {
        self.name = name
    }
}

class Apartment {
    var unit: String
    init(unit: String) {
        self.unit = unit
    }
}

Here, apartment is a weak reference that does not increase the counter of the Apartment object.