mp_units::operator‐

template<
    PointOrigin PO1,
    std::derived_from<quantity_point> QP>
requires QuantityPointOf<quantity_point, PO1{}> &&
             ReferenceOf<MP_UNITS_NONCONST_TYPE(reference), PO1::_quantity_spec_>
[[nodiscard]]
constexpr
Quantity auto
operator‐(
    PO1 po,
    QP const& qp);