class /*sentinel*/; // exposition only  |  (since C++23) | 
The return type of slide_view::end when the underlying view is not a common_range.
The name of this class (shown here as /*sentinel*/) is unspecified.
The /*sentinel*/ is used only when /*slide-caches-first*/<V> is true.
Typical implementations of /*sentinel*/ hold only one non-static data member – a sentinel end_ (the name is for exposition purposes only) of type ranges::sentinel_t<V>.
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 (C++23)   |   constructs a sentinel  (public member function)  | 
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 (C++23)   |   compares a sentinel with an iterator returned from slide_view::begin (function)  | 
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 (C++23)   |   computes the distance between a sentinel and an iterator returned from slide_view::begin (function)  | 
slide_view::sentinel [range.slide.sentinel] 
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