P3287 R2 Exploration of namespaces for std::simd

[wg21bot]

P3287R0 Exploration of namespaces for std::simd (Matthias Kretz)

[inbal2l]

2024-06-26 Library Evolution St. Louis Meeting

P3287R0: Exploration of namespaces for std::simd

2024-06-26 Library Evolution St. Louis Meeting Minutes

Champion: Matthias Kretz
Chair: Robert/Ben
Minute Taker: Eddie

Summary

POLL: We should introduce a std::simd namespace in P1928 (realizing that this would mean we potentially have a type whose fully-qualified name is std::simd::simd and would involve removing “simd” from basic_simd_mask) and remove the “simd_” prefix from utilities moved into that namespace which currently have that prefix.

SF	F	N	A	SA
9	6	3	1	1

Attendance: 20 IP + 9 R
# of Authors: 2
Author's Position: 2xSF
Outcome: Consensus in favour

POLL: Operations on std::simd::simd should be available in the namespace std::simd.

SF	F	N	A	SA
12	7	1	1	0

Attendance: 20 IP + 9 R
# of Authors: 2
Author's Position: 2xSF
Outcome: Consensus in favour

POLL: Element-wise overloads of existing functions in std which operate on std::simd::simd should also be available in the namespace std.

SF	F	N	A	SA
4	7	5	1	1

Attendance: 20 IP + 9 R
# of Authors: 2
Author's Position: 1xSF, 1xF
Outcome: Consensus in favour

Next Steps

The authors got feedback for relevant design questions and will apply it to the new revision, LEWG will see the next revision of the paper.

[wg21bot]

P3287R1 Exploration of namespaces for std::simd (Matthias Kretz)

[mattkretz]

P3287R2 Exploration of namespaces for std::simd (Matthias Kretz)

[cor3ntin]

Should we close this?

[jensmaurer]

Let's leave that to the LEWG chair.

[cor3ntin]

@inbal2l @mattkretz

[mattkretz]

Should we close this?

Why?

[inbal2l]

This needs to stay open for now.
Only part of the design changes proposed here were discussed during St. Louis, we will see the rest in Hagenberg (tentatively - Monday). Thanks, all.

[bstamour]

LWG polled this in Hagenberg Thursday morning:

Poll: put P3287r3 (as reviewed by TK and JG) into C++26?
|F|A|N|
|7|0|0|