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operator-

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operator-

template<class RanIt, class T, class Ref, class Ptr, class Dist>
    Dist operator-(
        const reverse_iterator<RanIt, T, Ref, Ptr, Dist>& lhs,
        const reverse_iterator<RanIt, T, Ref, Ptr, Dist>& rhs);

The template operator returns rhs.current - lhs.current.