std::ranges::join_view<V>::sentinel<Const>::sentinel
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                    | /*sentinel*/() = default; | (1) | (since C++20) | 
| constexpr explicit /*sentinel*/( Parent& parent ); | (2) | (since C++20) | 
| constexpr /*sentinel*/( /*sentinel*/<!Const> i )   requires Const && | (3) | (since C++20) | 
Constructs a sentinel.
1) Default constructor. Value-initializes the underlying sentinel.
3) Conversion from /*sentinel*/<false> to /*sentinel*/<true>. Move constructs the underlying sentinel 
end_ with std::move(i.end_).Parameters
| parent | - | a (possibly const-qualified) ranges::join_view | 
| i | - | a /*sentinel*/<false> | 
Example
| This section is incomplete Reason: no example |