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