tmp/tmpht3sd7_5/{from.md → to.md}
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#### Iterator support <a id="span.iterators">[[span.iterators]]</a>
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``` cpp
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using iterator = implementation-defined // type of span::iterator;
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```
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The type models `contiguous_iterator` [[iterator.concept.contiguous]],
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meets the *Cpp17RandomAccessIterator*
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requirements [[random.access.iterators]], and meets the requirements for
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constexpr iterators [[iterator.requirements.general]]. All requirements
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on container iterators [[container.requirements]] apply to
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`span::iterator` as well.
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``` cpp
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constexpr iterator begin() const noexcept;
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```
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*Returns:* An iterator referring to the first element in the span. If
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`empty()` is `true`, then it returns the same value as `end()`.
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``` cpp
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constexpr iterator end() const noexcept;
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```
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*Returns:* An iterator which is the past-the-end value.
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``` cpp
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constexpr reverse_iterator rbegin() const noexcept;
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```
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*Effects:* Equivalent to: `return reverse_iterator(end());`
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``` cpp
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constexpr reverse_iterator rend() const noexcept;
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```
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*Effects:* Equivalent to: `return reverse_iterator(begin());`
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