L.P. All rights reserved.© 2024 Bloomberg Finance L.P. All rights reserved. Designing a Slimmer Vector of Variants CppCon 2024 September 18, 2024 Chris Fretz Senior C++ Engineer 2© 2024 Bloomberg details my experience in creating a novel solution to an observed problem with memory usage of std::vector> • The talk starts with the motivating use case, considers several candidate Heterogeneous containers like std::vector> are an extremely natural way to represent data across many different paradigms • Naive usage of std::vector> can result in

1#include #include #include <vector> int a[] = {0, 1, 2, 3, 4}; std::vector c = {0, 1, 2, 3, 4}; auto main() -> int { std::cout << "C style array: " << sizeof(a) / sizeof(a[0]) sizeof(a[0]) << std::endl; std::cout << "Vector size: " << c.size() << std::endl; return 0; } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 https://www.reddit.com/r/cpp/comments/qm6i25/my_professor_is_telling _us_to_never_use_vectors/ 2more std::vector? 3How do you read a technical book front to back? As a technical editor... 4#include int main() { int cppconEarlyYears[6] = {2014, 2015, 2016

Back to Basics: The Abstract Machine Bob Steagall CppCon 2020 K E W B C O M P U T I N GCopyright © 2020 Bob Steagall K E W B C O M P U T I N G Overview/Goals • Describe abstract machines in general general • Describe the C++ abstract machine specifically • Language goals that drive its design • Role in program development and execution • Important definitions and characteristics • Important components components of the abstract machine, and their relationships • Provide a useful overview of the C++ abstract machine CppCon 2020 - The Abstract Machine 2Copyright © 2020 Bob Steagall K E W B C O M P U T I

which use CMake ○ C++ modules support ● Working with the community to improve building software ○ ISO standards ■ Dependency format ○ Pushing forward modules support in other build systems ■ xmake needed to order compilations ● Vendored into CMake for its Unix Makefiles generator ● dyndep support added to ninja, merged into 1.10 (released Jan 2020) 11C++ Modules: Example Target add_library(A) up ○ Object (uniqueness constraint) ○ Source file ○ Work directory ○ Arguments (no “command” support) ● Additional fields ○ For modules build graph ■ Provides (mapping of module name to BMI path)

Leveraging the power of C++ for efficient machine learning on embedded devices Adrian Stanciu adrian.stanciu.pub@gmail.com CppCon, 2023 1 / 50About me ◮ I am a software engineer from Romania ◮ I have Motivation ◮ Image classification ◮ Hand gesture recognition ◮ Summary ◮ Q&A 4 / 50Motivation 5 / 50Machine Learning (ML) ◮ Subfield of Artificial Inteligence (AI) ◮ Enables computers to learn from data and consumption ◮ May have real-time performance constraints 7 / 50Machine learning on embedded devices ◮ Alternative to cloud-based machine learning ◮ Advantages: ◮ Real-time processing ◮ Low latency ◮

micrograd++: A 500 line C++ Machine Learning Library Gautam Sharma Independent Researcher gautamsharma2813@gmail.com Abstract—micrograd++ is a pure C++ machine learning li- brary inspired by Andrej Karpathy’s framework for building and training machine learning models. By leveraging the performance efficiency of C++, micro- grad++ offers a robust solution for integrating machine learning capabilities directly into Traditionally, all machine learning libraries are extremely bulky and very hard to integrate as third party dependencies. This aspect scares practitioners to adopt a C++ based machine learning library for

C++ STL 容器全解之 vector by 彭于斌（ @archibate ） 往期录播： https://www.bilibili.com/video/BV1fa411r7zp 课程 PPT 和代码： https://github.com/parallel101/course C++ 标准库五大件：容器（ container ） C++ 标准库五大件：迭代器（ iterator STL 侯捷 STL vector 容器 vector 容器：构造函数 • vector 的功能是长度可变的数组，他里面的数据 存储在堆上。 • vector 是一个模板类，第一个模板参数是数组里 元素的类型。 • 例如，声明一个元素是 int 类型的动态数组 a ： • vector a; vector 容器：构造函数和 size • vector 可以在构造时指定初始长度。 explicit vector(size_t n); • 例如，要创建一个长度为 4 的 int 型数组 ： • vector a(4); • 之后可以通过 a.size() 获得数组的长度。 • 比如右边这段代码会得到 4 。 • size_t size() const noexcept; vector 容器： operator[] • 要访问 vector 里的元素，只需用

multiple calls • Compilers will not be modified to replace your library functions with language support. Calling a function over library boundaries with a single input/output value inhibits parallelization a struct Pixel { std::uint8_t b, g, r, a; }; (little-endian), • combined to an using Image = std::vector;. Task Write a function void to_gray(Image& img) { ... } that modifies the image in place that… b0 g0 r0 a0 b1 g1 r1 a1 · · · using Pixel = std::simd; using Image = std::vector; ************************* ************************* ************************* *************************

Jobs. Specifically, based on C++ coroutine which we shipped in C++ 20, without standard library support. I because the contents are pretty connected, so I will take all questions at the end but because compiler may work Notice that we have this __sum_resume function, which is a generally a big state machine generated by compiler. This function is invoked when we call coroutine_handle::resume 1617 17 default: ABORT(); } __sp1: // do work __final_suspend: } Coroutines are translated into state machine Initial suspend Final suspend, house keeping template struct task; task sum(int

for Canada ● Chair of Programming Languages for Standards Council of Canada Chair of WG21 SG19 Machine Learning Chair of WG21 SG14 Games Dev/Low Latency/Financial Trading/Embedded ● Editor: C++ SG5 software, applications, hardware, advanced system engineering, and early testbed platforms, in support of the nation’s exascale computing imperative. Additionally, this presentation used resources of for modern C++ heterogeneous programming 11SYCL 2020 Industry Momentum https://www.alcf.anl.gov/support-center/aurora/sycl-and-dpc-aurora https://www.embeddedcomputing.com/technology/open-source/risc-