5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.3 Quantity specification [qty.spec]

5.4.3.5 Operations [qty.spec.ops]

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namespace mp_units { struct quantity-spec-interface { // exposition only template<QuantitySpec Lhs, QuantitySpec Rhs> friend consteval QuantitySpec auto operator*(Lhs lhs, Rhs rhs); template<QuantitySpec Lhs, QuantitySpec Rhs> friend consteval QuantitySpec auto operator/(Lhs lhs, Rhs rhs); template<typename Self, UnitOf<Self{}> U> consteval Reference auto operator[](this Self self, U u); template<typename Self, typename FwdQ, Quantity Q = std::remove_cvref_t<FwdQ>> requires QuantitySpecExplicitlyConvertibleTo<Q::quantity_spec, Self{}> constexpr Quantity auto operator()(this Self self, FwdQ&& q); template<QuantitySpec Lhs, QuantitySpec Rhs> friend consteval bool operator==(Lhs, Rhs); }; }
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template<QuantitySpec Lhs, QuantitySpec Rhs> friend consteval QuantitySpec auto operator*(Lhs lhs, Rhs rhs);
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Returns: clone-kind-of<Lhs{}, Rhs{}>(expr-multiply<derived_quantity_spec, struct dimensionless>( remove-kind(lhs), remove-kind(rhs)))
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template<QuantitySpec Lhs, QuantitySpec Rhs> friend consteval QuantitySpec auto operator/(Lhs lhs, Rhs rhs);
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Returns: clone-kind-of<Lhs{}, Rhs{}>(expr-divide<derived_quantity_spec, struct dimensionless>( remove-kind(lhs), remove-kind(rhs)))
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template<typename Self, UnitOf<Self{}> U> consteval Reference auto operator[](this Self self, U u);
3
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Returns: make-reference(self, u).
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template<typename Self, typename FwdQ, Quantity Q = std::remove_cvref_t<FwdQ>> requires QuantitySpecExplicitlyConvertibleTo<Q::quantity_spec, Self{}> constexpr Quantity auto operator()(this Self self, FwdQ&& q);
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Returns: quantity{std::forward<FwdQ>(q).numerical-value, make-reference(self, Q::unit)}
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template<QuantitySpec Lhs, QuantitySpec Rhs> friend consteval bool operator==(Lhs, Rhs);
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Returns: std​::​is_same_v<Lhs, Rhs>.
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consteval QuantitySpec auto inverse(QuantitySpec auto q);
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Returns: dimensionless / q.
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template<std::intmax_t Num, std::intmax_t Den = 1, QuantitySpec Q> requires(Den != 0) consteval QuantitySpec auto pow(Q q);
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Returns: clone-kind-of<Q{}>( expr-pow<Num, Den, derived_quantity_spec, struct dimensionless>(remove-kind(q)));
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consteval QuantitySpec auto sqrt(QuantitySpec auto q);
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Returns: pow<1, 2>(q).
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consteval QuantitySpec auto cbrt(QuantitySpec auto q);
9
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Returns: pow<1, 3>(q).