5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.3 Quantity specification [qty.spec]

5.4.3.2 Concepts [qty.spec.concepts]

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template<typename T> concept QuantitySpec = SymbolicConstant<T> && std::derived_from<T, quantity-spec-interface>; template<typename T> concept QuantityKindSpec = // exposition only QuantitySpec<T> && is-specialization-of<T, kind_of_>(); template<typename T> concept NamedQuantitySpec = // exposition only QuantitySpec<T> && is-derived-from-specialization-of<T, quantity_spec>() && (!QuantityKindSpec<T>); template<typename T> concept DerivedQuantitySpec = // exposition only QuantitySpec<T> && (is-specialization-of<T, derived_quantity_spec>() || (QuantityKindSpec<T> && is-specialization-of<decltype(auto(T::quantity-spec)), derived_quantity_spec>())); template<auto Child, auto Parent> concept ChildQuantitySpecOf = (is-child-of(Child, Parent)); // exposition only template<auto To, auto From> concept NestedQuantityKindSpecOf = // exposition only QuantitySpec<decltype(From)> && QuantitySpec<decltype(To)> && (get_kind(From) != get_kind(To)) && ChildQuantitySpecOf<To, get_kind(From).quantity-spec>; template<auto From, auto To> concept QuantitySpecConvertibleTo = // exposition only QuantitySpec<decltype(From)> && QuantitySpec<decltype(To)> && implicitly_convertible(From, To); template<auto From, auto To> concept QuantitySpecExplicitlyConvertibleTo = // exposition only QuantitySpec<decltype(From)> && QuantitySpec<decltype(To)> && explicitly_convertible(From, To); template<auto From, auto To> concept QuantitySpecCastableTo = // exposition only QuantitySpec<decltype(From)> && QuantitySpec<decltype(To)> && castable(From, To); template<typename T, auto QS> concept QuantitySpecOf = QuantitySpec<T> && QuantitySpec<decltype(QS)> && QuantitySpecConvertibleTo<T{}, QS> && !NestedQuantityKindSpecOf<T{}, QS> && (QuantityKindSpec<T> || !NestedQuantityKindSpecOf<QS, T{}>); template<typename T> concept QSProperty = (!QuantitySpec<T>); // exposition only