C++20: An (Almost) Complete Overview September 15th 2020 Marc Grégoire Software Architect marc.gregoire@nikon.com2 Marc Grégoire  Belgium  Software architect for Nikon Metrology  Microsoft Belgian C++ Users Group (BeCPP)3 C++20 C++20 is big! Lots of new features! On Friday September 4, 2020, the C++20 standard passed ISO voting, expected to be formally published by the end of 2020.4 cppcon; // Module declaration namespace CppCon { auto GetWelcomeHelper() { return "Welcome to CppCon 2020!"; } export auto GetWelcome() { return GetWelcomeHelper(); } }  Consume a module: // main.cpp

ock::now()) };  Convert year_month_day to time_point: system_clock::time_point t1 { sys_days { 2020y / June / 22d } };  Convert time_point to year_month_day: year_month_day yearmonthday { floor(t1) sys_days { 2020y / June / 22d } + 9h + 35min + 10s };  Arithmetic auto d3 { d2 + days { 5 } }; // Add 5 days to d2  Streaming dates cout << d2 << '\n' << d3;  Output 2020-06-22 09:35:10 2020-06-27 09:35:1036 Dates  Careful: auto d2 { sys_days { 2020y / June / 22d } + 9h + 35min + 10s }; auto d3 { d2 + years { 1 } }; // Add 1 year to d2  Result d2 = 2020-06-22 09:35:10 d3 = 2021-06-22 15:24:22

Assembly Language and GPU Kernels in Visual Studio Code Julia Reid – _3 Visual Studio CppCon 2020 Visual Studio 2019 Preview 3 Preview 4 Preview 5 Preview 6 Version 16.8 Preview 1 Preview 2 Preview 4 Version 16.10 Preview 1 Preview 2 Preview 3 Version 16.11 CppCon 2020 Sep 2020 Aug 2021 May 2021 Mar 2021 Nov 2020 Visual Studio 2022 Preview 1 Preview 2 Preview 3 Preview 4 Release

Leveling Up in Rust • 2011 ~ 2014 EDA startup C/C++ • 2014 ~ 2020 DJI Ruby, Lua • 2020 ~ 2023 Microsoft C#, PowerShell • 2023 ~ now Cryptape languages implementation • My solutions to EOPL My experience • 2014 ~ 2018 Some small projects • 2020 ~ 2021 More open-source projects, gomoku, youki, dapr-wasm • 2022 ~ Regular contributions to

Version 1.0 - September 15, 2020 1 C++20 STL Features: 1 Year of Development on GitHub Stephan T. Lavavej "Steh-fin Lah-wah-wade" Principal Software Engineer, Visual C++ Libraries stl@microsoft.com @StephanTLavavej2 2: GitHub Development • For contributors and observers3 Overview Part 04 CppCon 2019  CppCon 2020 • Announced at CppCon 2019 • github.com/microsoft/STL • Apache License v2.0 with LLVM Exception migration ongoing • Build system (native desktop), test suite, issue database • Goal: Complete C++20 in 2020 • No promises, but we're working hard; refers to repo only5 C++20 Features: 60  23 Left6 C++20

Miya Natsuhara • Software Engineer on the Visual C++ Libraries Team (Microsoft) • Started in April 2020 • Lecturer at the University of Washington • Cute pup parent6 Agenda • Part I: Development Process using namespace std::chrono; int main() { year this_year{2021}; year last_year{2020}; year_month_day ymd{this_year, October, day{28}}; std::cout << ymd << "\n"; month_weekday std::cout << ymdlast_noleap << "\ t" << ymdlast_noleap.day() << "\n"; } Output: 2021-10-28 Nov/Thu[4] 2020/Feb/last 29 2021/Feb/last 2814 Some examples: operator/ with new chrono literals #include

Evolving the Rust Programming Language. PhD dissertation, Saarland University, August 2020 Recipient of the 2020 ACM Doctoral Dissertation Award Honorable Mention Recipient of the 2021 ACM SIGPLAN John

under the hood • Upcoming features • Lessons learned2012 2014 2015 2016 2017 2018 2019 2019/2020 2020 2021 NowStatic Analysisint f(int x) { if (x == 472349) { return 5/(x- 472349); } //

Still supported for testing and microbenchmarking. • 2020: One user: High frequency of retiring objects. Unsharded list grew out of control. • 2020: Sharded cohorts without reclamation under lock. Fast