5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.4 Unit [qty.unit]

5.4.4.6 Operations [qty.unit.ops]

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namespace mp_units { struct unit-interface { // exposition only template<UnitMagnitude M, Unit U> friend consteval Unit auto operator*(M, U u); friend consteval Unit auto operator*(Unit auto, UnitMagnitude auto) = delete; template<UnitMagnitude M, Unit U> friend consteval Unit auto operator/(M mag, U u); template<Unit Lhs, Unit Rhs> friend consteval Unit auto operator*(Lhs lhs, Rhs rhs); template<Unit Lhs, Unit Rhs> friend consteval Unit auto operator/(Lhs lhs, Rhs rhs); // [qty.unit.cmp], comparison template<Unit Lhs, Unit Rhs> friend consteval bool operator==(Lhs, Rhs); template<Unit Lhs, Unit Rhs> friend consteval bool equivalent(Lhs lhs, Rhs rhs); }; }
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template<UnitMagnitude M, Unit U> friend consteval Unit auto operator*(M, U u);
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Effects: Equivalent to: if constexpr (std::is_same_v<M, decltype(auto(mag<1>))>) return u; else if constexpr (is-specialization-of<U, scaled_unit>()) { if constexpr (M{} * U::mag == mag<1>) return U::reference-unit; else return scaled_unit<M{} * U::mag, decltype(auto(U::reference-unit))>{}; } else return scaled_unit<M{}, U>{};
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friend consteval Unit auto operator*(Unit auto, UnitMagnitude auto) = delete;
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Recommended practice: Suggest swapping the operands.
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template<UnitMagnitude M, Unit U> friend consteval Unit auto operator/(M mag, U u);
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Returns: mag * inverse(u).
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template<Unit Lhs, Unit Rhs> friend consteval Unit auto operator*(Lhs lhs, Rhs rhs);
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Returns: expr-multiply<derived_unit, struct one>(lhs, rhs).
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template<Unit Lhs, Unit Rhs> friend consteval Unit auto operator/(Lhs lhs, Rhs rhs);
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Returns: expr-divide<derived_unit, struct one>(lhs, rhs).
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consteval Unit auto inverse(Unit auto u);
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Returns: one / u.
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template<std::intmax_t Num, std::intmax_t Den = 1, Unit U> requires(Den != 0) consteval Unit auto pow(U u);
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Returns: expr-pow<Num, Den, derived_unit, struct one>(u).
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consteval Unit auto sqrt(Unit auto u);
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Returns: pow<1, 2>(u).
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consteval Unit auto cbrt(Unit auto u);
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Returns: pow<1, 3>(u).
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consteval Unit auto square(Unit auto u);
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Returns: pow<2>(u).
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consteval Unit auto cubic(Unit auto u);
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Returns: pow<3>(u).