P2372 Fixing locale handling in chrono formatters

[brycelelbach]

P2372R0 Fixing locale handling in chrono formatters (Victor Zverovich, Corentin Jabot)

[vitaut]

New revision: https://isocpp.org/files/papers/P2372R1.html

[ben-craig]

D2372R0: Fixing locale handling in chrono formatters

D2372R0: Fixing locale handling in chrono formatters

2021-05-03 Library Evolution Telecon Minutes

Chair: Ben Craig

Champion: Victor Zverovich

Minute Taker: Inbal Levi

Start: 2021-05-03

POLL: Revise D2372 to keep the ostream operators for chrono formatting dependent on the stream locale

Strongly Favor	Weakly Favor	Neutral	Weakly Against	Strongly Against
10	8	2	0	0

Attendance: 28

# of Authors: 2

Author Position: SF, N

Outcome: Strong Consensus in Favor

POLL: LEWG approves of the direction of this work and encourages further work as directed above with the intent that D2372 (Fixing locale handling in chrono formatters) will land in C++23 and be applied retroactively to C++20

Strongly Favor	Weakly Favor	Neutral	Weakly Against	Strongly Against
14	8	0	0	0

Attendance: 28

# of Authors: 2

Author Position: SF, SF

Outcome: Unanimous approval

Action for SG16: Retake poll on the direction. Capture the direction in that poll.

Action for Charlie Barto and Victor: Talk with STL (the person) to ensure he is aware of the likely coming changes. Also talk with Nico Josuttis, since he is working on a book.

[tahonermann]

As noted in the minutes for the LEWG 2021-05-03 telecon, LEWG requested that SG16 affirm LEWG's direction regarding P2372 as indicated by polls in prior comments. This request was made because prior SG16 polls of the proposed resolution of LWG3547 did not indicate consensus for that direction as indicated in the minutes from the SG16 telecon held 2021-04-28.

SG16 conducted the following poll during our 2021-05-12 telecon and did affirm LEWG's direction.

POLL: Forward D2372R1 to LEWG for inclusion in C++23 and with the intent that it be applied retroactively to C++20.

SF	F	N	A	SA
5	2	1	0	0

Attendance: 8

Outcome: Strong consensus in favor.

Note that D2372R1 contains the LEWG requested changes to preserve locale dependent formatting for ostream formatters.

My perception is that SG16's change in consensus is attributable to two factors:

1. New information that arrived after the initial poll.
2. SG16's original poll targeted C++23 while LEWG's poll targeted C++23 and C++20 as a DR; some concerns had previously been expressed regarding backward compatibility and migration.

[wg21bot]

P2372R1 Fixing locale handling in chrono formatters (Victor Zverovich, Corentin Jabot)