23 Containers library [containers]

23.7 Views [views]

23.7.2 Contiguous access [views.contiguous]

23.7.2.2 Class template span [views.span]

23.7.2.2.3 Deduction guides [span.deduct]

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template<class It, class EndOrSize> span(It, EndOrSize) -> span<remove_reference_t<iter_reference_t<It>>, maybe-static-ext<EndOrSize>>;
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Constraints: It satisfies contiguous_iterator.
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template<class R> span(R&&) -> span<remove_reference_t<ranges::range_reference_t<R>>>;
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Constraints: R satisfies ranges​::​contiguous_range.