P2499 string_view range constructor should be explicit

[wg21bot]

P2499R0 string_view range constructor should be explicit (James Touton)

[Bekenn]

I neglected to specify a ship vehicle in the paper. It should be C++23. This is a fix for a feature that is new in C++23. If the fix is postponed, it will be a breaking change.

[jensmaurer]

@brycelelbach , please note that the author wants this as a C++23 fix (which we might very well apply as late as post-CD, since it's a fix for a new feature that could/should have also come in via an NB comment).

[inbal2l]

@Bekenn, @jensmaurer, thank you for getting our attention. We figured it's a breaking change and originally scheduled this paper for a Jan LEWG ML review. @brycelelbach suggested we can see it post Feb as well (minor fix). In any case, I've updated the revision in the LEWG ML queue: https://github.com/cplusplus/LEWG/wiki/2022-Mailing-List-Reviews

[vitaut]

While the change itself is minor I wouldn't categorize P2499 as a minor fix because the new implicit conversions introduced in C++23 are extremely problematic. There will be one more paper about this in the January mailing but if P2499 was adopted sooner it would be even better.

[cor3ntin]

2022-02-08 Library Evolution Telecon

P2499R0: string_view range constructor should be explicit

P2516R0: string_view is implicitly convertible from what?

2022-02-08 Library Evolution Telecon P2499 Minutes

2022-02-08 Library Evolution Telecon P2516 Minutes

__POLL: We want to make the range constructor of string_view explicit (P2499R0)__

Strongly Favor	Favor	Neutral	Against	Strongly Against
3	17	1	0	0

Attendance: 35

# of Authors: 1

Author Position: SF

Outcome: Consensus

A similar poll on P2516 (#1174) was taken, P2499 got stronger support, therefore was forwarded.

Next Steps

Take an electronic poll to send P2499R0 (string_view Range Constructor Should Be Explicit) to Library Working Group for C++23, classified as B2 - Improvement.

[brycelelbach]

2022-05 Library Evolution Electronic Poll Outcomes

__POLL: Send [P2499R0] string_view Range Constructor Should Be Explicit to Library Working Group for C++23, classified as an improvement of an existing feature ([P0592R4] bucket 2 item).__

Strongly Favor	Weakly Favor	Neutral	Weakly Against	Strongly Against
13	7	1	2	0

Consensus in favor.

[JeffGarland]

LWG reviewed and approved 2022-07-08 Notes: https://wiki.edg.com/bin/view/Wg21telecons2022/P2499-20220708

poll: Put P2499r0 into C++23

F	A	N
16	0	1