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Section: 18.104.22.168 [span.overview] Status: WP Submitter: Stephan T. Lavavej Opened: 2018-04-12 Last modified: 2018-06-12
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There are multiple issues with how span specifies its iterators:
const_iterator isn't mentioned.
The relationship between iterator and const_iterator isn't specified. (span isn't a container, so it doesn't receive this automatically.)
The iterators should be specified to be constexpr.
By imitating 22.214.171.124 [string.view.iterators]/3 "All requirements on container iterators ([container.requirements]) apply to basic_string_view::const_iterator as well.", we can specify that iterator is convertible to const_iterator.
[ 2018-04-23 Moved to Tentatively Ready after 6 positive votes on c++std-lib. ]
[2018-06 Rapperswil: Adopted]
This wording is relative to N4741.
Edit 126.96.36.199 [span.overview] as indicated:
-4- The iterator type
for span is a random access iterator and a contiguous iterator.