5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.7 Operations [qty.ref.ops]

1
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Each member function with a trailing-return-type of -> reference-t<T...> returns {}.
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template<typename FwdRep, Reference R, RepresentationOf<get_quantity_spec(R{})> Rep = std::remove_cvref_t<FwdRep>> requires(!OffsetUnit<decltype(get_unit(R{}))>) constexpr quantity<R{}, Rep> operator*(FwdRep&& lhs, R r);
2
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Effects: Equivalent to: return quantity{std​::​forward<FwdRep>(lhs), r};
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template<typename FwdRep, Reference R, RepresentationOf<get_quantity_spec(R{})> Rep = std::remove_cvref_t<FwdRep>> requires(!OffsetUnit<decltype(get_unit(R{}))>) constexpr Quantity auto operator/(FwdRep&& lhs, R);
3
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Effects: Equivalent to: return quantity{std​::​forward<FwdRep>(lhs), inverse(R{})};
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template<typename FwdQ, Reference R, Quantity Q = std::remove_cvref_t<FwdQ>> constexpr Quantity auto operator*(FwdQ&& q, R); template<typename FwdQ, Reference R, Quantity Q = std::remove_cvref_t<FwdQ>> constexpr Quantity auto operator/(FwdQ&& q, R);
4
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Let @ be the operator.
5
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Effects: Equivalent to: return quantity{std::forward<FwdQ>(q).numerical-value, Q::reference @ R{}};
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template<Reference R, typename Rep> requires RepresentationOf<std::remove_cvref_t<Rep>, get_quantity_spec(R{})> constexpr auto operator*(R, Rep&&) = delete; template<Reference R, typename Rep> requires RepresentationOf<std::remove_cvref_t<Rep>, get_quantity_spec(R{})> constexpr auto operator/(R, Rep&&) = delete; template<Reference R, typename Q> requires Quantity<std::remove_cvref_t<Q>> constexpr auto operator*(R, Q&&) = delete; template<Reference R, typename Q> requires Quantity<std::remove_cvref_t<Q>> constexpr auto operator/(R, Q&&) = delete;
6
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Recommended practice: Suggest swapping the operands.