std::ranges::join_with_view<V,Pattern>:: iterator <Const>:: operator*

From cppreference.com
Ranges library
Range adaptors
constexpr decltype ( auto ) operator * ( ) const ;
(since C++23)

Returns the current element in the joined view.

Return value

std:: visit ( [ ] ( auto & it ) - > /*reference*/ { return * it ; } , inner_it_  ) , where /*reference*/ is ranges:: common_reference_t < std:: iter_reference_t < InnerIter  > ,
std:: iter_reference_t < PatternIter  >>
.

Example