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Observer class

An instance of this class provides a unique handle to an observer which can be used to detach it explicitly. It also holds a strong reference to the observed subject, so while it exists the subject and therefore the observer will not be destroyed.

If the handle is destroyed without calling Detach(), the lifetime of the observer is tied to the subject.

Synopsis

template <typename D>
class Observer
{
public:
    // Constructor
    Observer();
    Observer(Observer&& other);	// Move

    // Assignemnt
    Observer& operator=(Observer&& other); // Move

    // Tests if this instance is linked to a node
    bool IsValid() const;

    // Sets weight override for linked node
    void SetWeightHint(WeightHint hint);

    // Manually detaches the linked observer node from its subject
    void Detach();
};