deduction guides for `std::ranges::join_view`

template<class R>
explicit join_view(R&&) -> join_view<views::all_t<R>>;

(since C++20)

The deduction guide is provided for std::ranges::join_view to allow deduction from range.

Example

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https://en.cppreference.com/w/cpp/ranges/join_view/deduction_guides