5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.2 Dimension [qty.dim]

5.4.2.2 Concepts [qty.dim.concepts]

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template<typename T> concept Dimension = SymbolicConstant<T> && std::derived_from<T, dimension-interface>; template<typename T> concept BaseDimension = // exposition only Dimension<T> && (is-derived-from-specialization-of<T, base_dimension>()); template<typename T, auto D> concept DimensionOf = Dimension<T> && Dimension<decltype(D)> && (T{} == D);