Declared in <mp-units/framework/quantity.h>
template<
UnitOf<quantity_spec> U,
RoundingPolicy Policy>
requires detail::ExplicitlyCastable<unit, U{}, rep> && detail::ValidRoundingPolicyFor<Policy, rep, rep>
[[nodiscard]]
constexpr
RepresentationOf<quantity_spec> auto
numerical_value_in(
U,
Policy policy) const noexcept;
The return value should not be discarded.