FR 005-134 22.14.6.4 [format.string.escaped] Aggressive escaping

[wg21bot]

The intent of "escaped strings" is unclear and unsuited to many spoken languages

As it stands, this features escapes ● Invalid code unit sequences ● Non printable characters ● All combining marks and other grapheme extenders ● Whitespaces using different techniques ● escape \ and " It is not clear that all these behaviours should be regrouped in the same facility. In particular, escaping all combining codepoints is not suitable for many languages, especially Korean.

Please consider either: ● Not escaping combining codepoints which are part of a grapheme cluster. Removing this feature and replace it by a set of facility performing each of these operations in a future C++ standard

[brycelelbach]

@tahonermann you get first crack at this. Send it back to us when it's ready.

[tahonermann]

SG16 reviewed this issue during its 2022-11-02 telecon. The following poll was taken:

• Poll 1: [FR 005-134]: SG16 recommends accepting the comment in the direction presented in the first bullet of the proposed change and as recommended in the polls for US 38-098.
  • Attendees: 8
  • Unanimous consent

See the SG16 review notes for US 38-098 for additional details.

This is ready for LEWG review.

[nliber]

2022-11-07 15:15 to 17:00 UTC-10 Kona Library Evolution Meeting

FR-005-134: Aggressive escaping

US-38-098: Escaping for debugging and logging

2022-11-07 15:15 to 17:00 UTC-10 Kona Library Evolution Minutes

Champion: Victor Zverovich (in-person)

Chair: Nevin Liber & Fabio Fracassi

Minute Taker: Steve Downey

POLL: We agree with the direction of the proposed SG16 recommendation for US-38-098 & FR-005-134.

Strongly Favor	Weakly Favor	Neutral	Weakly Against	Strongly Against
9	7	0	0	0

Outcome: Unanimous consent

Next Steps

Take a Library Evolution electronic poll to send the proposed SG16 recommendation for US-38-098 & FR-005-134 to Library for C++23, classified as B2 - Improvement.

[brycelelbach]

I need a paper with the proposed resolution for Library Evolution electronic polling.

[tahonermann]

SG16 reviewed P2713R0 (Escaping improvements in std::format) during its [2022-11-30 telecon](). The following poll was taken.

• Poll 1: P2713R0: Forward to LEWG as the recommended resolution of US 38-098 and FR 005-134 amended with discussed wording changes.
  • Attendees: 10
  • No objection to unanimous consent.

P2713R1 implements the SG16 requested wording changes.

@brycelelbach, the needs-paper label should now be removed; this issue is again ready for LEWG consideration.

[jensmaurer]

"needs-paper" removed.

[brycelelbach]

This has a paper now, P2713 https://github.com/cplusplus/papers/issues/1418.

Labeling has-paper.

[JeffGarland]

LWG saw this via telecom ahead of Issaquah

https://wiki.edg.com/bin/view/Wg21telecons2023/P2713-20230201

See details in the paper issue.

[jensmaurer]

Accepted with modifications; se P2713R1 for details.