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3203. span element access invalidation

Section: 22.7.3.1 [span.overview] Status: New Submitter: Johel Ernesto Guerrero Peña Opened: 2019-05-04 Last modified: 2020-09-06

Priority: 2

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Discussion:

span doesn't explicitly point out when its accessed elements are invalidated like string_view does in 21.4.3.3 [string.view.iterators] p2.

[2019-06-12 Priority set to 2 after reflector discussion]

Proposed resolution:

This wording is relative to N4810.

  1. Modify 22.7.3.1 [span.overview] as indicated:

    -4- ElementType is required to be a complete object type that is not an abstract class type.

    -?- For a span s, any operation that invalidates a pointer in the range [s.data(), s.data() + s.size()) invalidates pointers, iterators, and references other than *this returned from s's member functions.