5 Quantities and units library [quantities]

5.4 Reference [qty.ref]

5.4.4 Unit [qty.unit]

5.4.4.2 Magnitude [qty.unit.mag]

5.4.4.2.2 Concepts [qty.unit.mag.concepts]

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template<typename T> concept MagConstant = SymbolicConstant<T> && is-derived-from-specialization-of<T, mag_constant>(); template<typename T> concept UnitMagnitude = (is-specialization-of<T, unit-magnitude>()); template<typename T> concept MagArg = std::integral<T> || MagConstant<T>; // exposition only