P0849 auto(x): DECAY_COPY in the language

[wg21bot]

P0849R0 auto(x): DECAY_COPY in the language (Zhihao Yuan)

[jensmaurer]

Marked as "backlog" on San Diego EWG-I wiki.

[jfbastien]

Discussed in EWG-I in Kona, want to see again with updates.

[wg21bot]

P0849R1 auto(x): decay-copy in the language (Zhihao Yuan)

[jfbastien]

EWGI in Cologne:
Continue spending committee time on this versus other proposals, given that time is limited?
SF F N A SA
2 6 5 0 0
Forward to EWG with the additional discussions requested.
SF F N A SA
1 4 5 0 0

[wg21bot]

P0849R2 auto(x): decay-copy in the language (Zhihao Yuan)

[inbal2l]

ML review (on D0849R7) ended. A short summary of the directions:

• Please add an explicit design intent statements into the paper:
  • auto(x) of a move-only lvalue is intended to be ill-formed ("conversion to auto" is not intended to do hidden moves)
  • expand on decay-copy, decay_t.
• Fix: [range.all.general]/2 change needs to be reverted.
• Consider https://godbolt.miator.net/z/Gdz1nh and P0847: Deducing this

This paper was also seen in LEWG's telecon (https://wiki.edg.com/bin/view/Wg21telecons2021/P0849#Library-Evolution-2020-02-16)

[brycelelbach]

2021-02-02 Library Evolution Telecon

P0849R6: auto(x): DECAY_COPY in the language

2021-02-02 Library Evolution Telecon Minutes

Poll: Forward P08496R7 to LWG to find out whether there are issues that would prevent electronic polling

No objection to unanimous consent

Attendance: 33

# of Authors: 1

Outcome: No objection to unanimous consent

Summary

We looked at this language feature proposal, since the problem/solution space is closely related to library matters, and arguably a library solution might have been possible. The Paper was presented by the Author, providing rationale why the language feature is the right way to go. There was a short discussion, that did not turn up any concerns with proposed solution.

Outcome

We unanimously agreed with the presented solution, The paper will proceed to Library working group, and then to electronic polling.

[wg21bot]

P0849R7 auto(x): decay-copy in the language (Zhihao Yuan)

[jfbastien]

This was voted on in the EWG May 2021 polling period, and received consensus.

Poll: Forward P0849r7 "auto(x): DECAY_COPY in the language" to Core for C++23, and affirm LEWG’s guidance to forward it to Library.

SF	F	N	A	SA
9	18	2	0	1

[jensmaurer]

2021-07-12 CWG teleconference: Approved for plenary vote; forwarding to LWG for review and motion.

[JeffGarland]

This was seen 2021-08-20 by LWG and will be forwarded to the next plenary for c++23.

https://wiki.edg.com/bin/view/Wg21telecons2021/P0849-20210820

F	A	N
6	0	0

[wg21bot]

P0849R8 auto(x): decay-copy in the language (Zhihao Yuan)