mp_units::value_cast

Explicit cast of a quantity point's unit and representation type

Synopsis

Declared in <mp-units/framework/value_cast.h>
template<
    Unit auto ToU,
    typename ToRep,
    typename FwdQP,
    QuantityPoint QP = std::remove_cvref_t<FwdQP>>
requires (MP_UNITS_WEAK_UNIT_OF(MP_UNITS_REMOVE_CONST(decltype(ToU)), QP::quantity_spec)) &&
          RepresentationOf<ToRep, QP::quantity_spec> && std::constructible_from<ToRep, typename QP::rep> &&
          detail::SaneScaling<QP::unit, ToU, ToRep>
[[nodiscard]]
constexpr
QuantityPoint auto
value_cast(FwdQP&& qp);

Description

Implicit conversions between quantities of different types are allowed only for "safe" (e.g. non-truncating) conversion. In truncating cases an explicit cast have to be used.

auto qp = value_cast<us, int>(quantity_point{1.23 ms});

Template Parameters

Name Description
ToU a unit to use for the target quantity
ToRep a representation type to use for the target quantity

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