typedef see below element_type;
Type: Ptr::element_type if such a type exists; otherwise, T if Ptr is a class template instantiation of the form SomePointer<T, Args>, where Args is zero or more type arguments; otherwise, the specialization is ill-formed.
typedef see below difference_type;
Type: Ptr::difference_type if such a type exists; otherwise, std::ptrdiff_t.
template <class U> using rebind = see below;
Alias template: Ptr::rebind<U> if such a type exists; otherwise, SomePointer<U, Args> if Ptr is a class template instantiation of the form SomePointer<T, Args>, where Args is zero or more type arguments; otherwise, the instantiation of rebind is ill-formed.