LWG Chair post-meeting report

Overview

This is meant to be an ongoing paper, with a series of reports, capturing the information provided by the LWG chair during the plenary session at the previous meeting.

R1: Rapperswil, June 6-11, 2018

General

LWG (again) entered the week with a large backlog of papers; somewhere around 55. We have dealt with more papers than we accumulated this week, but we still have a large backlog. We reviewed 39 papers, adopting 26 of them. (Five of those are being moved by CWG).

To deal with this backlog of work, we will be holding an additional, LWG-only meeting in Battavia, IL the week of August 20-24. Thanks to Walter Brown for organizing this.

Notable Accomplishments

• The Parallelism TS 2 is now ready for publishing.
• The Reflection TS is now ready for PDTS balloting, after adding the contents of P0670R4 (Function Reflection).
• We are moving the paper "Concepts for the Standard Library".
• We are moving "Atomic Ref".
• Moar Constexpr (array, algorithms)
• We removed a bunch of deprecated features from the standard library.
• We adopted a pair of papers that improve the interface of the standard containers.
• We have 15 issue resolutions to propose as well.

Discussed, but did not move

• P0009 - mdspan
• P0805 - Comparing Containers
• P0811 - Well-behaved interpolation for numbers and pointers
• P0942 - Introducing a <smart_ptr> header

R0: Jacksonville, March 6-11, 2018

General

LWG entered the week with a large backlog of papers; somewhere around 55. We may have exited the week with a larger backlog than we started, since other groups have sent us many papers during the week. Our throughput was limited this week because we spent the first two days of the meeting on two (very large) papers; P0214 (Data-parallelism) and P0355 (calendar support). Fortunately, we completed our review, the authors turned the changes around, and we moved both of them.

Notable Accomplishments

• The Parallelism TS 2 is now ready for PDTS balloting, after adding the contents of P0214.
• The Reflection TS has been created, and initial content has been added.
• The Library Fundamentals 3 TS has been created, with all the parts of LFTS 2 that weren't added into C++17. More will be added here in future meetings.
• We added calendar and time zone support into <chrono> for C++20.
• We added <span> to C++20.
• We added <version> to C++20; a place to put implementation-specific configuration and versioning.
• We have added "Moar constexpr" to the standard library.
• Some issue processing was done

Discussed, but did not move

• expected<T>
• polymorphic_value

Future work

In plenary, I asked for a show of hands for people who would be willing to attend an extra "LWG-only" weeklong session in the late summer. About 14 people raised their hands. Assuming that we can find a venue (and a sufficient number commit to attend), we will have an extra meeting this summer.

We have been processing issues on the reflector; mostly with prioritization, but more and more, we're trying to solve them there. I expect this to continue. Of course, all resolutions will be proposed and voted on in formal meetings.