mp_units::operator‐

template<
    std::derived_from<quantity_point> QP,
    PointOrigin PO2>
requires QuantityPointOf<quantity_point, PO2{}> &&
             ReferenceOf<MP_UNITS_NONCONST_TYPE(reference), PO2::_quantity_spec_>
[[nodiscard]]
constexpr
Quantity auto
operator‐(
    QP const& qp,
    PO2 po);