std::move_sentinel<S>::base
From cppreference.com
                    
                                        
                    < cpp | iterator | move sentinel
                    
                                                            
                    |   constexpr S base() const;  | 
(since C++20) | |
Returns the underlying base sentinel.
Parameters
(none)
Return value
The underlying sentinel.
Exceptions
May throw implementation-defined exceptions.
Example
| This section is incomplete Reason: no example  | 
See also
|    (C++11)  | 
  accesses the underlying iterator  (public member function of std::move_iterator<Iter>)  |