mp_units::quantity_point::operator QP_

template<
    typename QP_,
    QuantityPointLike QP = std::remove_cvref_t<QP_>>
requires (point_origin == quantity_point_like_traits<QP>::point_origin) &&
            std::convertible_to<quantity_type, quantity<quantity_point_like_traits<QP>::reference,
                                                        typename quantity_point_like_traits<QP>::rep>>
[[nodiscard]]
constexpr
explicit(quantity_point_like_traits<QP>::explicit_export || !std::convertible_to<quantity_type, quantity<quantity_point_like_traits<QP>::reference, typename quantity_point_like_traits<QP>::rep>>)
operator QP_() const & noexcept(noexcept(quantity_point_like_traits<QP>::from_numerical_value(this‐>quantity_from_origin_is_an_implementation_detail_.numerical_value_is_an_implementation_detail_)) && std::is_nothrow_copy_constructible_v<rep>);