5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.3 Quantity specification [qty.spec]

5.4.3.4 Utilities [qty.spec.utils]

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template<QuantitySpec auto... From, QuantitySpec Q> consteval QuantitySpec auto clone-kind-of(Q q); // exposition only
1
#
Effects: Equivalent to: if constexpr ((... && QuantityKindSpec<decltype(From)>)) return kind_of<Q{}>; else return q;
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template<QuantitySpec Q> consteval auto remove-kind(Q q); // exposition only
2
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Effects: Equivalent to: if constexpr (QuantityKindSpec<Q>) return Q::quantity-spec; else return q;
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template<QuantitySpec QS, Unit U> requires(!AssociatedUnit<U>) || UnitOf<U, QS{}> consteval Reference auto make-reference(QS, U u); // exposition only
3
#
Effects: Equivalent to: if constexpr (requires { requires get_quantity_spec(U{}) == QS{}; }) return u; else return reference<QS, U>{};