2018 Bloomberg Finance L.P. All rights reserved. © 2024 Bloomberg Finance L.P. All rights reserved. Can you RVO? Using Return Value Optimization for Performance in Bloomberg’s C++ Codebases CppCon 2024 2018 Bloomberg Finance L.P. All rights reserved. © 2024 Bloomberg Finance L.P. All rights reserved. Can You RVO? How many people here have heard about “Return Value Optimization”? 2 How many people here onwards) *U*RVO) So … we can turn off (N)RVO 😈… 19© 2018 Bloomberg Finance L.P. All rights reserved. -fno-elide-constructors What about MSVC? MSVC disables NRVO by default … can be enabled using /Zc:nrvo

Thursday 28th • C++20’s Calendars and Time Zones in MSVC – Miya Natsuhara • An Editor Can Do That? Debugging Assembly Language and GPU Kernels in Visual Studio Code – Julia Reid • Why does

Tooling @ Microsoft 🐘 @ciura_victor@hachyderm.io 🦋 @ciuravictor.bsky.social 🦀 So You Think You Can Hash CppCon September 20242024 Victor Ciura | @ciura_victor - Unleashing 🦀 The Ferris Within algorithm designers can concentrate on designing better hash algorithms, with little worry about how these new algorithms can be incorporated into existing code. Type designers can create their hash support Ferris Within 6 Goals Hash algorithm designers can concentrate on designing better hash algorithms, with little worry about how these new algorithms can be incorporated into existing code.2024 Victor

1Can data-oriented-design be improved? Ollivier Roberge Collège Jean-de-Brébeuf 2A brief historic • 1960s • FORTRAN • Lisp • 1980s • OOP • Structured programming • Modules • 2000s • Template Hand-optimize cache lines and struct layout 6How can we improve it? • We could ask ChatGPT… 7 That’s cool, but it won’t get us very far…How can we improve it? (second try) • At its core DoD is just: Ranges • Functions pointers • In compile-time code • Types are data (ex: metaprogramming) • We can apply ideas from functional programming in C++ 17Introducing “transformation-oriented design” • The

Can eBPF save us from the Data Deluge? A case for file filtering in eBPF Giulia Frascaria October 28, 2020 1 The data deluge on modern storage 2 Compute node CPU Network Storage node Flash Data transfer is business-critical ● We can blindly drop DoS 12 So similar yet so different ● DoS is malicious ● Data transfer is business-critical ● We can blindly drop DoS 13 But could we reduce

Jonathan Boccara @JoBoccara THE PIPES LIBRARY HOW PLUMBING CAN MAKE YOUR CODE EXPRESSIVE At the beginning of time…2 WORKING WITH COLLECTIONS IN C++ -∞ Now3 WORKING WITH COLLECTIONS IN C++ -∞ for_each59 LIMITATIONS Pipes don’t know what’s coming next. How to implement reverse? drop_last? Can’t send a range to an individual pipe: inputs >>= transform(f); Have to create the results container

Can’t we just synthesize std::tuple_element from get? Jonathan Müller — @foonathanAdding structured bindings support to a custom tuple-like type template struct my_tuple { … }; Jonathan Jonathan Müller — @foonathan Can’t we just synthesize std::tuple_element from get? CppCon 2024-09-18 1Adding structured bindings support to a custom tuple-like type template struct my_tuple std::remove_cvref_t> auto get(Tuple&& t) -> decltype(auto) { … } Jonathan Müller — @foonathan Can’t we just synthesize std::tuple_element from get? CppCon 2024-09-18 1Adding structured bindings support

-- danielanderson.net std::atomic atomic: Holds a shared_ptr that can be manipulated atomically! • void store(shared_ptr desired) • shared_ptr load() • bool co 16-byte atomics. • Generally ubiquitous and widely available. • std::atomic might not work… • Can use boost::atomic instead!  • Used by Anthony Williams’ implementation • Pack the pointer atomic • Need to implement alias pointers Possible avenues for further work • Hybrid algorithm? Can we do a mixture of split reference count and deferred reclamation to get performance that is always

the rescue! Subsumption rules! 27x is Type Concepts to the rescue! Subsumption rules! • Concepts can subsume other concepts, • Works only with concepts – no type traits allowed (!) • Concepts identified void fun(inherited_from auto f) { /* ... */ }; g++-10 Clang-12 MSVC v19.29 50x is predicate (we can do better) g++-10 Clang-12 MSVC v19.29 template constexpr bool is( X const& std::variant_npos; } g++-10 Clang-12 MSVC v19.30 78is(v) – v1 & v2.1 79is - takeaways • You can implement an is operator as a set of overloaded functions, • Compiler Explorer helps in checking

Microsoft Developer Division Team name Microsoft Confidential How Visual Studio Code can help you develop more efficiently in C++ From your First Line of Code to your Largest Repo:Microsoft C++ Meet Performance improvements: Machines now have 2x the RAM and 1.3x the CPU Performance • Widened access: Can access from individual accountsMicrosoft C++ Remote - Tunnels Connect to a Remote Machine via a secure Cooperative C++ Evolution: Towards a Typescript for C++ – Herb Sutter (Keynote) • How Visual Studio Code Can Help You Develop More Efficiently in C++ – Alexandra Kemper & Sinem Akinci • Regular, Revisited