Common Package Specification (CPS) in practice: A full round trip implementation in Conan C++ package manager CppCon24Outline - Introduction to Common Package Specification (CPS) - Creation of CPS CMake projects Why a Common Package Specification (CPS) 4Common Package Specification (CPS) ZLib zlib.cps 5 …Existing solutions Searching for Convergence in C++ Package Management - Bret Brown & Daniel Daniel Ruoso - CppNow 2022 Case For a Standardized Package Description Format for External C++ Libraries by Luis Caro Campos - CppCon22 6 set(_ZLIB_x86 "(x86)") set(_ZLIB_SEARCH_NORMAL PATHS "[HKE

Rud Merriam | A Journey into Non-Virtual Polymorphism 2 Who Doesn’t Recognize This?? 1990 Borland Turbo C++Cppcon 2023 | Rud Merriam | A Journey into Non-Virtual Polymorphism 3 Background ● Experience – Medium.com (https://medium.com/@rudmerriam)Cppcon 2023 | Rud Merriam | A Journey into Non-Virtual Polymorphism 4 Polymorphism ● Greek: “many forms” (Obligatory statement) ● The use of a single variableCppcon 2023 | Rud Merriam | A Journey into Non-Virtual Polymorphism 5 Polymorphic Variables ● Base class pointer to derived class – Virtual functions are not bad! ● Standard Template Library

carePhoto by Tech Nick on unsplashSimple benchmark class Base { public: int concrete() const; virtual int virt() const; }; void benchmark(Base *b, size_t num_iterations) { auto start = Clock::now(); virt_duration = end-start;There are interesting technical details and surprising conclusions that virtual functions can be actually faster. Since CPU architectures are mentioned, I'd expect to see deep nt-vs-inheritance-vs-other- ways-performanceDoes it even matter?Conclusions ● The notion that “virtual functions are slower” is flat out wrong. ○ Which is not to say they are faster ○ Some of the suggested

A Common Package Specification: Getting Build Tools to Talk to Each Other Lessons Learned From Making Thousands of Binaries Consumable by Any Build System Diego Rodriguez-Losada @ CppCon 2023Outline configuration: Windows, x86_64, VS-2022, Release, static library 3. Install (system package manager or language package manager), build from source by the user, with that configuration 4. Pass information main(void){ … deflateInit(&defstream, Z_BEST_COMPRESSION); Build system scripts What is a package 5 ZLib - Independent unit of build and release (versionable) - Ready to use (binary)#include

name, const NodeConfig& config) : SyncActionNode(name, config) {} // You must override this virtual function NodeStatus tick() override { std::cout << "Type: [ApproachEnemy]. Instance:" <<

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Decentralized package manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Binary management sources in the same repo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 6.3 Package development flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 6.6 Define package ABI compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 i

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Decentralized package manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Binary management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.6 Defining Package ABI Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.7 Inspecting Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 5.9 Package Creator Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Decentralized package manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Binary management packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.6 Define package ABI compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 5.9 Tools for package creators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 6 Uploading

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Decentralized package manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Binary management packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 6.6 Define package ABI compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 6.9 Tools for package creators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7 Uploading

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Decentralized package manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Binary management packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 6.6 Define package ABI compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 6.9 Tools for package creators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 7 Uploading