Document numberP0985R2
ProjectProgramming Language C++, WG21
Reply-toMarshall Clow <>

LWG Chair post-meeting report


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.

R2: Batavia, August 20-24, 2014


In August, LWG met in Batavia, IL to try to reduce the backlog of work that was facing us for C++20. There were about 18 people in attendance.

Since this was not an official WG21 meeting, we could not approve any motions for incorporation into C++20. However, we approved a bunch of papers (and issues) to be put on the motions page in San Diego.

Notable Accomplishments

We reviewed a large chunk of the Ranges proposal (about 150 pages of the 220 page paper). Casey will revise the paper, and we have continued the review on the reflector. (See postings titled "Paper working review: D0896").

There were two fairly large new papers at this meeting. These were both clarification/cleanup papers, rather than proposing new features, and they were both reviewed favorably. Tim Song's paper is titled "Cleaning up Clause 20". Nevin Liber's paper is titled "Explicitly Implicifying explicit Constructors".

Tentatively Approved for C++20 (to be moved in San Diego)

Discussed, but did not approve

R1: Rapperswil, June 6-11, 2018


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

Discussed, but did not move

R0: Jacksonville, March 6-11, 2018


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

Discussed, but did not move

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.