20 General utilities library [utilities]

20.10 Memory [memory]

20.10.3 Pointer traits [pointer.traits]

20.10.3.2 Member types [pointer.traits.types]

using element_type = see below;

Type: Ptr::element_type if the qualified-id Ptr::element_type is valid and denotes a type ([temp.deduct]); 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.

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using difference_type = see below;

Type: Ptr::difference_type if the qualified-id Ptr::difference_type is valid and denotes a type ([temp.deduct]); otherwise, ptrdiff_t.

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template<class U> using rebind = see below;

Alias template: Ptr::rebind<U> if the qualified-id Ptr::rebind<U> is valid and denotes a type ([temp.deduct]); 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.