Quick Reference  Founder of the Belgian C++ Users Group (BeCPP) C++204 Agenda  C++23 Core Language  Explicit Object Parameters  if consteval  Multidimensional Subscript Operator  Attributes Attributes on Lambda-Expressions  Literal Suffix for size_t  auto(x): decay-copy in The Language  #elifdef, #elifndef, and #warning  Marking Unreachable Code  Assumptions  Named Universal Character Associative Containers Heterogeneous Erasure  Removed Features  Garbage Collection SupportC++23 Core Language6 Agenda  C++23 Core Language  Explicit Object Parameters  if consteval  Multidimensional

CppCon 2021 CppCon 2021 What’s New In ‘ Visual Studio 64-bit IDE, C++20, WSL2, and More Marian Luparu (he/him) @mluparu Sy Brand (they/them) @TartanLlama C++ Product Team, Microsoft @VisualC https://aka much much more… https://aka.ms/cpp/code Thu 10/28 – 2pm An Editor Can Do That? Debugging Assembly Language and GPU Kernels in Visual Studio Code Julia Reid – _3 Visual Studio CppCon 2020 version 16.11, C++20 is now feature complete • All features under /std:c++20 switch are production ready including modules, coroutines, concepts • C++20 features awaiting DR resolution are available for now

VS Code @ CppCon 2024 What’s new for Visual Studio Code: Performance, GitHub Copilot, and CMake Enhancements (Provided by Conference)Meet the Speakers Sinem Akinci PM for C++ Copilot and CMake in Kemper PM for the C++ Extension for VS CodeAgenda: What's new in VS Code Faster Performance Smarter GitHub Copilot suggestions Easier to use Features for CMake & C/C++ Extensible and secure Copilot solutions solutions Wait I want to learn about Visual Studio! Check out the talk tomorrow @ 13:30 “What’s New in Visual Studio for C++ Developers” – Mryam Girmay & Michael PriceVS Code has a rich extension ecosystem

cartesian_product 🕙 Coming next for C++23 • Deducing this (modules support) • 9 remaining C++ STL features ✅ C++98* * with /permissive- ✅ C++11 ✅ C++14 ✅ C++17 ✅ C++20 🐱‍🏍 C++23 with /std:c++latest Studio 2022 version 17.6, C++20 for C++/CLI • Use /std:c++20 in your C++/CLI projects. • Most C++20 features are supported except for support for module import under /clr. Visit https://aka.ms/cpp20-cppcli Thread-specific storage Visit https://aka.ms/c11-threads for more details AnnouncingStatic Analysis • 10+ new checks: • High-confidence lifetime checks. • Date calculations not considering leap years. • Evaluation

(February 2024) Implementation experience in Clang Open questions: ● Floating point support? ● New-value-returning variants? ● Atomic min/max operations are valuable additions to the C++ standard 0f); float new_max = 15.0f; float result_max = atomic_value.fetch_max(new_max); std::cout << "Old max: " << result_max << ", New max: " << atomic_value << std::endl; float new_min = 5.0f; fetch_min(new_min); std::cout << "Old min: " << result_min << ", New min: " << atomic_value << std::endl; return 0; } Expected output: Old max: 10, New max: 15 Old min: 15, New min: 15Conclusion

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 @StephanTLavavej 1 Version 1.0 - September down the slide numbers • Part 0: Overview • What's happened in the last year • Part 1: C++20 STL Features • Everything here is Standard, except as noted • Part 2: GitHub Development • For contributors 2019 • github.com/microsoft/STL • Apache License v2.0 with LLVM Exception • Implemented ~50 C++20 features • Majority from our amazing contributors • Extensively reviewed and tested • Released VS 2019

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 down the slide numbers • Part 0: Overview • What's happened in the last year • Part 1: C++20 STL Features • Everything here is Standard, except as noted • Part 2: GitHub Development • For contributors • github.com/microsoft/STL • Apache License v2.0 with LLVM Exception • Implemented ~50 C++20 features • Majority from our amazing contributors • Extensively reviewed and tested • Released VS 2019

Leveraging C++20/23 Features for Low Level InteractionsOverview In a baremetal environment, we’re going to demonstrate e�ective use of C++ How did we end up with C language HW interactions? What are best referencesKey C++ Safety Features There’s lots, but…. Lifetime Management Smart pointers handle new/delete for you. We’ll mostly be discussing unique_ptr Strict Typing C++ has plenty of language elements that of a smart pointer: But this will cause a ‘delete’ when the scope changes So we need to tell the language to not delete Where D is a (dangerous!) custom deleter de�ned by: shared_ptr my_ptr = rhs;

SSH/container/WSL remote experiences and much, much more… https://aka.ms/cpp/code Thu 09/19 – 16:15pm What’s New for Visual Studio Code Alexandra Kemper & Sinem Akinci10 Years of Microsoft @ CppCon Many thanks to… https://aka.ms/github-copilot-features • Activate within Visual Studio • Includes GitHub Copilot Chat and editor suggestions • Enables GitHub Copilot-powered features. Look for: • Works with any repository modules • Fewer missed bugs (more checks for inlined calls) with Address Sanitizer Performance • New SLP vectorizer to vectorize non-loop code o https://aka.ms/cpp/slp-vec-example • Better utilization

Why should I care about reflection?• Extension to the type system • WPF, Automatic Bindings • Language bindings: Python • Content editors • Automatic change detection 8 Why do I care about reflection std::string name; float x, y, z; }; Entity entity; entity.*member = 42.0f; Entity* heap_entity = new Entity(); heap_entity->*member = 2024.0f; C++ pointer to member• Type erasing a member variable • DestructorFunc destructor; }; template void erased_constructor(void* object_memory) { new (object_memory) T(); } template void erased_destructor(void* object) { static_cast(object)->~T();