From Jason Turner

[span.iterators]

C++20 → C++23 1.0 KB 11 lines
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C++ Weekly: Ep 14

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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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+ ##### 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]], whose value type
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+ is `value_type` and whose reference type is `reference`.
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+
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+ All requirements on container iterators [[container.reqmts]] 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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  ```