Is there any case where a return of a RValue Reference (&&) is useful?

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There are a few occasions when it is appropriate, but they are relatively rare. The case comes up in one example when you want to allow the client to move from a data member. For example:

template <class Iter>
class move_iterator
{
private:
    Iter i_;
public:
    ...
    value_type&& operator*() const {return std::move(*i_);}
    ...
};

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