Just an FYI that the P2300 LEWG meeting is happening right before this one. So if that goes long expect some to be late to this meeting.
Topic: SG14 Low Latency MonthlyThis meeting is focused on Financial/low latency. But if time permits, we can alsodiscuss Patrice's WIP games pape, P2300, and SwiftHi,Michael Wong is inviting you to a scheduled Zoom meeting.Topic: SG14 monthlyTime: 2nd Wednesdays 02:00 PM Eastern Time 1900 UTC (US and Canada) Every month on the Second Wed,Join from PC, Mac, Linux, iOS or Android:https://iso.zoom.us/j/93151864365?pwd=aDhOcDNWd2NWdTJuT1loeXpKbTcydz09 Password: 789626Or iPhone one-tap : US: +12532158782,,93151864365# or +13017158592,,93151864365#Or Telephone: Dial(for higher quality, dial a number based on your current location): US: +1 253 215 8782 or +1 301 715 8592 or +1 312 626 6799 or +1346 248 7799 or +1 408 638 0968 or +1 646 876 9923 or +1 669 900 6833 or 877 853 5247 (Toll Free) Meeting ID: 931 5186 4365 Password: 789626 International numbers available: https://iso.zoom.us/u/abRrVivZoDOr Skype for Business (Lync): https://iso.zoom.us/skype/93151864365Agenda:1. Opening and introductionISO Code of Conduct<https://isotc.iso.org/livelink/livelink?func=ll&objId=20882226&objAction=Open&nexturl=%2Flivelink%2Flivelink%3Ffunc%3Dll%26objId%3D20158641%26objAction%3Dbrowse%26viewType%3D1>ISO patent policy.https://isotc.iso.org/livelink/livelink/fetch/2000/2122/3770791/Common_Policy.htm?nodeid=6344764&vernum=-2IEC Code of Conduct:https://www.iec.ch/basecamp/iec-code-conduct-technical-workWG21 Code of Conduct:https://isocpp.org/std/standing-documents/sd-4-wg21-practices-and-procedures1.1 Roll call of participants1.2 Adopt agenda1.3 Approve minutes from previous meeting, and approve publishing previously approved minutes to ISOCPP.org1.4 Action items from previous meetings2. Main issues (125 min)2.1 General logisticsFuture meeting plans Jan 12, 2022 02:00 PM ET/1900 UTC: Finance/Low LatencyFeb 9, 2022 02:00 PM ET/1900 UTC: GamesMar 9, 2022 02:00 PM ET/1900 UTC: Embedded2.2 Paper reviews
Discussion on Loww Latency/Finance topics
P2300
LEWG 3.5 hours each day in the past 3 months
sender receiver and asio
one addon change to C++23 to forward to library,
still design decision discussions outstanding; need change to some of this to increase consensus
majority happy, but some improvement to the paper could improve consensus over 6 strongly against
some concerns: too much rush at end of release cycle, should this make C++ 23
P2300, differs sender vs typed sender(signature of receiver), and calls set value
1. non-typed senders are going away, must have signature
2. tag_invoke forwards customization to a layered stack of receivers for example, the return value needs to satisfy the concept and the tag_invoke on the receiver needs to work; both these requirements need to be satisfied
3. environment introduced so receiver can be queried for its environment in the connect function, so you can ask received for its environment to give properties like async wait state; can query the environemnt
4. sender trait defines the type for the set value overloads so you can look at properties of receiver so you can query receiver for set value signature; also helper structs to help you construct the special way in which teh set value set down
against : due to rushing, any sender type erased sender; require set error channel to always forward eh ptr because set value can throw
receiver concept requires that set error handler handles eh ptr Eric is looking at it, could be a problem for asynchronous networking on a single thread? how will this support ISRsm should not be only error channel
PB tried implementing minimal parts of it and did not see eh ptr requirement
is it throw all caution to the wind to get this through
Matthew Bentley
Colony name is a point of contention
Hive is now in the lead
BS has some concern on the name? LEWG, aiming for 23
need this out of LEWG by mid year, as it will take 3-5 cycles in LWG
SP summarized Swift model using annotation model for concurrent safety, though it seems Swift is not specifically about that and this is more narrow
[[lock-free]], [[real-time]] [[no-alloc]]
MW mentioned interest in RUST and C++ safety
JM ask if there are general purposed annotation models to indentify functions with labels as being correct to the label
ST mentioned wrong defaults and the annotation burden
Discussion about Games topics: P2388R1 - Minimum Contract Support: either Ignore or Check_and_abort<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2388r1.html>Patrice's WIP on Games issues.Finance topics from July 14, 2021.https://lists.isocpp.org/sg14/2021/06/0636.phphttps://lists.isocpp.org/sg14/2021/07/0642.php2.2.1 any other proposal for reviews?Deterministic Exception for Embedded by James Renwickhttps://www.pure.ed.ac.uk/ws/portalfiles/portal/78829292/low_cost_deterministic_C_exceptions_for_embedded_systems.pdfFreestanding?SG14/SG19 features/issues/defects:https://docs.google.com/spreadsheets/d/1JnUJBO72QVURttkKr7gn0_WjP--P0vAne8JBfzbRiy0/edit#gid=02.3 Domain-specific discussions2.3.1 SIG chairs - Embedded Programming chairs: Ben Craig, Wouter van Ooijen and Odin Holmes, John McFarlane - Financial/Trading chairs: Staffan TjernstrÃmCarl Cooke, Neal Horlock, - Games chairs: Rene Riviera, Guy Davidson and Paul Hampson, Patrice Roy - Linear Algebra chairs: Bob Steagall, Mark Hoemmen, Guy Davidson2.4 Other Papers and proposals2.5 Future F2F meetings:2.6 future C++ Standard meetings:https://isocpp.org/std/meetings-and-participation/upcoming-meetings-3. Any other businessReflectorhttps://lists.isocpp.org/mailman/listinfo.cgi/sg14As well as look through papers marked "SG14" in recent standards committeepaper mailings:http://open-std.org/jtc1/sc22/wg21/docs/papers/2015/http://open-std.org/jtc1/sc22/wg21/docs/papers/2016/Code and proposal Staging areahttps://github.com/WG21-SG14/SG144. Review4.1 Review and approve resolutions and issues [e.g., changes to SG'sworking draft]4.2 Review action items (5 min)5. Closing process5.1 Establish next agenda5.2 Future meetingJan 12, 2022 02:00 PM ET/1900 UTC: Finance/Low LatencyFeb 9, 2022 02:00 PM ET/1900 UTC: Games GUYMar 9, 2022 02:00 PM ET/1900 UTC: Embedded
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