namespace std { template <class T> pair<T*, ptrdiff_t> get_temporary_buffer(ptrdiff_t n) noexcept; template <class T> void return_temporary_buffer(T* p); }
template <class T>
pair<T*, ptrdiff_t> get_temporary_buffer(ptrdiff_t n) noexcept;
template <class T> void return_temporary_buffer(T* p);