23 Strings library [strings]

23.3 String view classes [string.view]

23.3.3 Class template basic_string_view [string.view.template]

23.3.3.3 Deduction guides [string.view.deduct]

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template<class It, class End> basic_string_view(It, End) -> basic_string_view<iter_value_t<It>>;
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Constraints:
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template<class R> basic_string_view(R&&) -> basic_string_view<ranges::range_value_t<R>>;
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Constraints: R satisfies ranges​::​contiguous_range.