5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.4 Unit [qty.unit]

5.4.4.7 Comparison [qty.unit.cmp]

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template<Unit Lhs, Unit Rhs> friend consteval bool operator==(Lhs, Rhs);
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Returns: std​::​is_same_v<Lhs, Rhs>.
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template<Unit Lhs, Unit Rhs> friend consteval bool equivalent(Lhs lhs, Rhs rhs);
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Effects: Equivalent to: const auto lhs_canonical = get-canonical-unit(lhs); const auto rhs_canonical = get-canonical-unit(rhs); return lhs_canonical.mag == rhs_canonical.mag && lhs_canonical.reference_unit == rhs_canonical.reference_unit;
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template<Unit From, Unit To> consteval bool convertible(From from, To to);
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Effects: Equivalent to: if constexpr (std::is_same_v<From, To>) return true; else if constexpr (PotentiallyConvertibleTo<From, To>) return std::is_same_v<decltype(get-canonical-unit(from).reference_unit), decltype(get-canonical-unit(to).reference_unit)>; else return false;