24 Containers library [containers]

24.7 Views [views]

24.7.2 Contiguous access [views.contiguous]

24.7.2.2 Class template span [views.span]

24.7.2.2.7 Iterator support [span.iterators]

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using iterator = implementation-defined;
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The type models contiguous_iterator ([iterator.concept.contiguous]), meets the Cpp17RandomAccessIterator requirements ([random.access.iterators]), and meets the requirements for constexpr iterators ([iterator.requirements.general]), whose value type is value_type and whose reference type is reference.
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All requirements on container iterators ([container.reqmts]) apply to span​::​iterator as well.
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constexpr iterator begin() const noexcept;
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Returns: An iterator referring to the first element in the span.
If empty() is true, then it returns the same value as end().
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constexpr iterator end() const noexcept;
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Returns: An iterator which is the past-the-end value.
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constexpr reverse_iterator rbegin() const noexcept;
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Effects: Equivalent to: return reverse_iterator(end());
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constexpr reverse_iterator rend() const noexcept;
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Effects: Equivalent to: return reverse_iterator(begin());