On Tue, Mar 16, 2021 at 3:59 PM Tom Honermann via SG16 <
sg16_at_[hidden]> wrote:

> SG16 will hold a telecon on Wednesday, March 24th at 19:30 UTC (timezone
> conversion
> <https://www.timeanddate.com/worldclock/converter.html?iso=20210324T193000&p1=1440&p2=tz_pdt&p3=tz_mdt&p4=tz_cdt&p5=tz_edt&p6=tz_cet>
> ).
>
> *For participants in North America, please note that daylight savings time
> went into effect this past weekend, so this telecon will start one hour
> later than our last telecon (Mexico doesn't observe DST until April 4th).*
>
> The agenda is:
>
> - Continue discussion from the last telecon concerning:
> - D2314R1: Character sets and encodings
> <https://wiki.edg.com/pub/Wg21telecons2021/SG16/d2314r1.html>
> - D2297R1: Wording improvements for encodings and character sets
> <https://isocpp.org/files/papers/D2297R1.pdf>
> - Discuss priorities and goals for C++23.
>
> For D2314R1 <https://wiki.edg.com/pub/Wg21telecons2021/SG16/d2314r1.html>
> and D2297R1 <https://isocpp.org/files/papers/D2297R1.pdf>, discussion
> will be limited to new information that might help to break the stalemate
> regarding use of an abstract character set or UCS scalar values as the
> specification tool for describing translation. If consensus is not
> reached, we'll poll forwarding D2314R1
> <https://wiki.edg.com/pub/Wg21telecons2021/SG16/d2314r1.html> with
> direction that EWG and/or CWG choose the wording mechanism.
>
> Per P1000 <https://wg21.link/p1000>, papers targeting C++23 must be
> forwarded by EWG/LEWG to CWG/LWG by the February, 2022 meeting (Portland).
> However, the deadline for initial papers proposing new language features is
> ~November, 2021. Time is running short, and competition for time in
> EWG/LEWG will increase.
>
> The following lists the current state of SG16 related papers and our C++23
> effort to date. This is presented as food for thought. What story does
> this tell? How will that story be received by the C++ community? What
> should we do with our remaining time to either strengthen or change that
> story? What can we realistically do to bring more direct benefits to the
> C++ community? It may be interesting to review what we were thinking
> about during our March 13th, 2019 telecon
> <https://github.com/sg16-unicode/sg16-meetings/blob/master/README-2019.md#march-13th-2019>
> .
>
> These papers have been accepted for C++23:
>
> - P2029 <https://wg21.link/p2029>: Proposed resolution for core issues
> 411, 1656, and 2333; numeric and universal character escapes in character
> and string literals
>
> These papers have been approved by EWG and are in the pipeline for CWG:
>
> - P1949 <https://wg21.link/p1949>: C++ Identifier Syntax using Unicode
> Standard Annex 31
> - P2201 <https://wg21.link/p2201>: Mixed string literal concatenation
> - P2223 <https://wg21.link/p2223>: Trimming whitespaces before line
> splicing
>
> These papers have been approved by SG16 and are in the pipeline for
> EWG/LEWG:
>
> - P1885 <https://wg21.link/p1885>: Naming Text Encodings to Demystify
> Them
> - P2093 <https://wg21.link/p2093>: Formatted output
> - P2246 <https://wg21.link/p2246>: Character encoding of diagnostic
> text
> - P2316 <https://wg21.link/p2316>: Consistent character literal
> encoding
>
> These papers are in the pipeline for EWG/LEWG, but require a revision to
> make progress:
>
> - P2071 <https://wg21.link/p2071>: Named universal character escapes
>
>
I would like us to make progress on that! Afaik there isn't a lot of work
remaining, right?


>
> -
>
> These papers are currently active in SG16:
>
> - D2314R1 <https://wiki.edg.com/pub/Wg21telecons2021/SG16/d2314r1.html>:
> Character sets and encodings
> - D2297R1 <https://isocpp.org/files/papers/D2297R1.pdf>: Wording
> improvements for encodings and character sets
>
> With that summary of what we have been doing above in mind, the following
> lists provide some options for what we could work on next.
>
> These are existing papers available for SG16 to prioritize: (Some of
> these, such as P1629, are awaiting revisions).
>
> - P1628 <https://wg21.link/p1628>: Unicode character properties
>
> As the author I do not expect to do further work on this in the 23 cycle

>
> - P1629 <https://wg21.link/p1629>: Standard Text Encoding
> - P1729 <https://wg21.link/p1729>: Text Parsing
> - P1859 <https://wg21.link/p1859>: Standard terminology for execution
> character set encodings
>
> This is mostly superseded by 2314/2297 - we should make sure the direction
are consistent


>
> - P1953 <https://wg21.link/p1953>: Unicode Identifiers And Reflection
>
> This is ending progress in SG-7


>
> - P2295 <https://wg21.link/p2295>: Correct UTF-8 handling during phase
> 1 of translation
>
> Expect a revision of that soon

>
> -
>
> And finally, here are some ideas that have been discussed, but that we do
> not currently have papers covering:
>
> - UTF-8 as a portable source file encoding (the paper Tom started and
> has long intended to complete).
>
> See also P2295


>
> - Requiring wchar_t to represent all members of the execution wide
> character set does not match existing practice
> <https://github.com/sg16-unicode/sg16/issues/9>
>
> Please let's investigate that!

>
> - WG21 P1854: Source to Execution encoding conversion should not lead
> to loss of information <https://github.com/sg16-unicode/sg16/issues/50>
>
> Expect further work on that in the coming months

>
> - Deprecate std::regex <https://github.com/sg16-unicode/sg16/issues/57>
> - Make wide multicharacter character literals ill-formed
> <https://github.com/sg16-unicode/sg16/issues/65>
>
> I'll write a paper

>
> -
> - Improve portable ingestion of command-line arguments
> <https://github.com/sg16-unicode/sg16/issues/66>
> - Alias barriers; a replacement for the ICU hack
> <https://github.com/sg16-unicode/sg16/issues/67>
>
> This seems very important - the char8_t adoption story isn't great right
now.

>
>
> Our efforts will need to be balanced with any effort expended to align C23
> with changes made for C++20 and C++23:
>
> - WG14 N2231: char8_t: A type for UTF-8 characters and strings
> <https://github.com/sg16-unicode/sg16/issues/5>
> - WG14: Make char16_t/char32_t string literals be UTF-16/32
> <https://github.com/sg16-unicode/sg16/issues/54>
> - WG14: Improve support for Unicode characters in identifiers
> <https://github.com/sg16-unicode/sg16/issues/56>
> - WG14: numerical & universal character escapes in char & string
> literals <https://github.com/sg16-unicode/sg16/issues/63>
> - WG14: Trimming whitespace before line splicing
> <https://github.com/sg16-unicode/sg16/issues/64>
>
> Tom.
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