template< bool Const > class /*sentinel*/; // exposition only  |  (since C++23) | 
The return type of zip_view::end when the underlying view is not a common_range. The name of this class template (shown here as sentinel) is unspecified.
The type /*sentinel*/<true> or /*sentinel*/<false> treats the underlying view as const-qualified or non-const-qualified respectively.
Typical implementation of sentinel holds only one non-static data member:
std::tuple<ranges::sentinel_t<Views>...> if Const is false, or std::tuple<ranges::sentinel_t<const Views>...> if Const is true. |  
 (C++23)   |   constructs a sentinel  (public member function)  | 
|  
 (C++23)   |   compares a sentinel with an iterator returned from zip_view::begin (function)  | 
|  
 (C++23)   |   computes the distance between a sentinel and an iterator returned from zip_view::begin (function)  | 
    © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
    https://en.cppreference.com/w/cpp/ranges/zip_view/sentinel