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3573. Missing Throws element for basic_string_view(It begin, End end)

Section: 27.3.3.2 [string.view.cons] Status: C++23 Submitter: Hewill Kang Opened: 2021-07-13 Last modified: 2023-11-22

Priority: Not Prioritized

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Discussion:

The standard does not specify the exceptions of this constructor, but since std::to_address is a noexcept function, this constructor throws if and only when end - begin throws, we should add a Throws element for it.

[2021-08-20; Reflector poll]

Set status to Tentatively Ready after eight votes in favour during reflector poll.

[2021-10-14 Approved at October 2021 virtual plenary. Status changed: Voting → WP.]

Proposed resolution:

This wording is relative to N4892.

1. Modify 27.3.3.2 [string.view.cons] as indicated:

   template<class It, class End>
     constexpr basic_string_view(It begin, End end);
   

   -7- Constraints:

   […]

   -8- Preconditions:

   […]

   -9- Effects: Initializes data_ with to_address(begin) and initializes size_ with end - begin.

   -?- Throws: When and what end - begin throws.