P3222 R1 Fix C++26 by adding transposed special cases for P2642 layouts

[wg21bot]

P3222R0 Fix C++26 by adding transposed special cases for P2642 layouts (Mark Hoemmen)

[ben-craig]

2024-08-27 Library Evolution Telecon

P3222R0: Fix C++26 by adding transposed special cases for P2642 layouts

2024-08-27 Library Evolution Telecon Minutes

Champion: Mark Hoemmen
Chair: Ben Craig
Minute Taker: Guy Davidson

Summary

• Why this facility should go into the standard library? Fixing existing std facilities
• Examples? Yes
• Field experience?
  • Implementation experience? Yes
  • Usage experience? No
  • Deployment experience? No
• Performance considerations? Yes
• constexpr? No change
• Discussion of prior art? yes, with BLAS and CBLAS
• Changes Library Evolution previously requested? N/A
• Support for "std::format", "hash", and allocators (if required)? No
• Wording? Yes, though context diffs would be nice
• Feature test macro? Yes, though there is a clash with P3050R2
• Freestanding? Already freestanding

POLL: Forward P3222R0 (Fix C++26 by adding transposed special cases for P2642 layouts) to LWG for C++26 classified as B0 ("now or never"), to be confirmed with a Library Evolution electronic poll.

SF	WF	N	WA	SA
5	4	0	0	0

Attendance: 16
# of Authors: 1
Author Position: SF
Outcome: Unanimous Consent

Next Steps

P3222R0 will be added to the next round of electronic polling to be forwarded to LWG, targeting C++26.

[inbal2l]

P3222R0 was added to LEWG 2024 October electronic poll paper (P3467R0)

Update:
P3222R0 was forwarded to LWG for C++26 on LEWG 2024 October electronic poll (P3468R0)

[JeffGarland]

LWG reviewed and approved this paper for C++26 in telecom.

https://wiki.edg.com/bin/view/Wg21telecons2024/P3222R0-20241025

Poll: Put P3222r1 into C++26?

F	A	N
8	0	0