CROSS-PLATFORM PITFALLS AND HOW TO AVOID THEM Erika Sweet (she/her) Microsoft C++ TeamWelcome to CppCon 2020! Visit our table at the Expo Hall https://aka.ms/cppcon/expo • Meet the Microsoft C++ Abdicating responsibility to CMake Reimplementing functionality that CMake has built-in to abstract platform and compiler specificsUse built-in CMake command line tools…. execute_process(COMMAND ${CMAKE_COMMAND} rget PUBLIC cxx_std_11) …instead of manually setting flags via CMAKE_CXX_FLAGSKeep your paths platform independent…. target_include_directories(myTarget PUBLIC $

of) 2 3Why FP Determinism is Important?_ CppCon 2024 sixit:: 5 ✅ Same Executable Cross Platform Different Contexts ❌ ❌ 1 (Sort of) 2 3 General Sanity, Testability Distributed Simulations using the identically compiled files and run on systems that adhere to the IEEE standards. Cross platform synchronized network simulations or replays will not possible [sic].” - Most upvoted answer on

career in video games and embedded software • Started using C++ in 1995 • First cross-platform project in 1994Cross-Platform Architecture Goals • Take advantage of all platforms • Focus on the compiler • Minimize classes, an illustrative example from a larger project • Project build issues • Inclusion of platform-specific header files • Concept hierarchies • Class and Function DesignOCP: The Open–Closed Principle Adding new revisions to a feature has no effect on previously-implemented revisions.What is a Platform? • A specific set of features • A feature is an abstract unit of functionality requiring implementations

readAndAccess(Func userFn) { // Called frequently hazard_pointer hp = make_hazard_pointer(); // Construct hazard pointer. T* ptr = hp.protect(src_); // Get pointer to a protected object hazard_pointer hp[3]; /* Three hazard pointers are made nonempty separately. */ hp[0] = make_hazard_pointer(); hp[1] = make_hazard_pointer(); hp[2] = make_hazard_pointer(); assert(!hp[0].empty()); empty()); assert(!hp[1].empty()); assert(!hp[2].empty()); /* src is atomic */ T* ptr = hp[0].protect(src); /* etc */ } /* Three nonempty hazard pointers are destroyed separately. */ Batch

measurements (nanosecond resolution) Negligible overhead (a few nanoseconds per zone) Cross-platform (Windows, Linux, macOS, iOS, Android, WASM*) Hybrid profiling capabilities (sampling and/or instrumentation) measurements (nanosecond resolution) Negligible overhead (a few nanoseconds per zone) Cross-platform (Windows, Linux, macOS, iOS, Android, WASM*) Hybrid profiling capabilities (sampling and/or instrumentation) measurements (nanosecond resolution) Negligible overhead (a few nanoseconds per zone) Cross-platform (Windows, Linux, macOS, iOS, Android, WASM*) Hybrid profiling capabilities (sampling and/or instrumentation)

measurements (nanosecond resolution) Negligible overhead (a few nanoseconds per zone) Cross-platform (Windows, Linux, macOS, iOS, Android, WASM*) Hybrid profiling capabilities (sampling and/or instrumentation) measurements (nanosecond resolution) Negligible overhead (a few nanoseconds per zone) Cross-platform (Windows, Linux, macOS, iOS, Android, WASM*) Hybrid profiling capabilities (sampling and/or instrumentation) measurements (nanosecond resolution) Negligible overhead (a few nanoseconds per zone) Cross-platform (Windows, Linux, macOS, iOS, Android, WASM*) Hybrid profiling capabilities (sampling and/or instrumentation)

pointer A SRC A hazard pointer is a single-writer multi-reader pointer. set HP to A if SRC == A clear HP 2 3 6 if HP != A HP Safe to delete A A 7 8 SAFE ACCESS If a hazard pointer points to an object

all rights reserved Page 1 Game Development for Human Beings Build Cross-Platform Games with Phaser Kristen Dyrr Pablo Farias Navarro Renan Oliveira Ben Sparks Zenva for Schools – Coding Courses for High School Students Zenva for Schools is an online platform for high schools, which includes interactive courses in programming, web development and game development Smarter enemy We will change our enemy so it will switch direction if arrives the edge of platform. The idea is to check if the next ground position is occupied by a tile and, if not so, switch

Injection Hazards void Processor::buildQuoteNZFlag(const Side& side) { // ... const Exch::TickHelper& hp = updater_.processingContext().exchanges().get(side.exchangeNumber()).legacyTickHelper(); // ... } Dependency Injection Hazards void Processor::buildQuoteNZFlag(const Side& side, const LegacyTickHelper& hp ) { // ... } Law of Demeter : Only talk to your immediate friends Reaching through multiple objectsBloomberg

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