5 Quantities and units library [quantities]

5.7 Quantity point [qty.pt]

5.7.3 Interoperability [qty.pt.like]

template<typename T>
concept QuantityPointLike =
  !QuantityPoint<T> &&
  qty-like-impl<T, quantity_point_like_traits> &&  // see [qty.like]
  requires {
    typename quantity_point<quantity_point_like_traits<T>::reference,
                            quantity_point_like_traits<T>::point_origin,
                            typename quantity_point_like_traits<T>::rep>;
  };