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### 3144. `span` does not have a `const_pointer` typedef

Section: 24.7.3.1 [span.overview] Status: C++20 Submitter: Louis Dionne Opened: 2018-07-23 Last modified: 2021-02-25

Priority: 0

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Discussion:

`std::span` does not have a typedef for `const_pointer` and `const_reference`. According to Marshall Clow, this is merely an oversight.

[2019-01-20 Reflector prioritization]

Set Priority to 0 and status to Tentatively Ready

Proposed resolution:

This wording is relative to N4750.

1. Change 24.7.3.1 [span.overview], class template `span` synopsis, as indicated:

   >     namespace std {
   >       template<class ElementType, ptrdiff_t Extent = dynamic_extent>
   >       class span {
   >       public:
   >         // constants and types
   >         using element_type = ElementType;
   >         using value_type = remove_cv_t<ElementType>;
   >         using index_type = ptrdiff_t;
   >         using difference_type = ptrdiff_t;
   >         using pointer = element_type*;
   >         using const_pointer = const element_type*;
   >         using reference = element_type&;
   >         using const_reference = const element_type&;
   >         using iterator = implementation-defined;
   >         using const_iterator = implementation-defined;
   >         using reverse_iterator = reverse_iterator<iterator>;
   >         using const_reverse_iterator = reverse_iterator<const_iterator>;
   >         static constexpr index_type extent = Extent;

   >         […]
   >       };
   >       […]
   >     }