company. Ⓡ © 2021 Apex.AI, Inc. Igor Bogoslavskyi Testing the compilability of the code at runtime© 2021 Apex.AI, Inc. Errors have a high cost, so rigorous testing is a must We use increasingly

retry_count = 0; while(!connected) { try { connect (…); connected = true; } catch(const std::runtime_error&) { if (retry_count++ > max_retries) throw; } } … } 34 Bloomberg Exceptional Trier retry_count = 0; while(!connected) { try { connect (…); notify(connected = true); } catch(const std::runtime_error&) { if (retry_count++ > max_retries) { notify(connected); throw; } } } … } 35 Bloomberg type) { try { … auto name = get_name_from_type(type); return transmit(name); } catch(const std::runtime_error& e) { std::cerr << "key : " << key << “, type : " << type << " - " << e.what() << std::endl;

design decision 38.2RUNTIME RUNTIME POLYMORPHISM POLYMORPHISM 39RUNTIME POLYMORPHISM Design decision! Strong coupling between types Share base classes and common interface 40RUNTIME POLYMORPHISM Design types Share base classes and common interface Interface must have same meaning for all types 40.1RUNTIME POLYMORPHISM Design decision! Strong coupling between types Share base classes and common interface types Implementation must be correct for all types 40.2RUNTIME POLYMORPHISM Better Code: Runtime Polymorphism - Sean Parent Better Code: Runtime Polymorphism - Sean Parent "The requirement of a polymorphic

if(first_digit) throw std::runtime_error( std::format("'{}' is not a number", number)); else throw std::runtime_error( std::format("'{}' has non-numeric passed string has non-numeric digits Error: passed string is not a number std::expectedruntime_error> parse_int(std::string_view number) { int out = 0; bool first_digit = true; first_digit ? std::unexpected( std::runtime_error("passed string is not a number")) : std::unexpected( std::runtime_error("passed string has non-numeric digits"));

tons of false positives. Now that you’re hooked on smart tools, you have to try dynamic/runtime analysis. After years of improvements and successes for Clang and GCC users, LLVM AddressSanitizer for MSVC projects. We’ll see how AddressSanitizer works behind the scenes (compiler and ASan runtime) and analyze the instrumentation impact, both in perf and memory footprint. We’ll examine a handful perf profiler CI/CD service SCM client package manager static analyzer dynamic analyzer (runtime) automated refactoring tools build system + fuzzing code reviews platform12 17 year old code

the executable ○ The linker is indirectly invoked by gcc ○ Part of the compiler toolchain ● The runtime linker-loader (ld.so) found the library when launching it ○ Launched the application ○ Part of location The runtime linker/loader can not find the library nowThe dynamic linker loader (ld.so) - search procedureLinux example: library in non-default locationRuntime linker/loader - rpath ● Runtime search search path embedded in the ELF executable or libraryRuntime linker/loader - rpath ● Runtime search path embedded in the ELF executable or library ● The $ORIGIN keyword: the directory containing the executable

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Chapter 03: Language Runtime Enhancements 37 3.1 Lambda Expression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Runtime Indexing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Merge complex template types. At the same time, a lot of enhancements have been made to the language runtime. The emergence of Lambda expressions has given C++ the “closure” feature of “anonymous functions”

framework 的核心；我尝试剖析其中美好的对象导向性质（注1）的实 作方式，亦尝试剖析其中与Windows 程序设计模型（注2）息息相关之特殊性质（注3）的 实作方式。 注1：此指runtime type information、dynamic creation、persistence、document/view¡ K。 注2：此指message based、event driven 会根据你的选项做出不同 的程序代码，我所据以解说的，是大众化选项下的产品。 第四篇以微软公司附于Visual C++ 光盘片上的一个范例程序Scribble 为主轴，一步一步加 上新的功能。并在其间深入介绍Runtime Type Information（RTTI）、Dynamic Creation、 Persistence（Serialization）、Message Mapping、Command Routing Visual C++ 4.0 两本 书，也都多多少少开始涉及MFC 核心。我有一种「德不孤必有邻」的喜悦。 为了维护本书更多的唯一性，也由于我自己又钻研获得了新的心得，本书增加了前版未有的 Runtime Type Information、Dynamic Creation 等主题，对于Message Mapping 与Command Routing 的讨论也更详细得多，填补了上一版的缝隙。更值得一提的是，

I DON'T HAVE THE PARAMETERS THAT WILL CONSTRAIN THE CODE AT RUNTIME, I IF I DON'T HAVE THE PARAMETERS THAT WILL CONSTRAIN THE CODE AT RUNTIME, I CAN'T TAILOR THE CODE TO THEM CAN'T TAILOR THE CODE TO THEM I DON'T HAVE THE PARAMETERS THAT WILL CONSTRAIN THE CODE AT RUNTIME, I IF I DON'T HAVE THE PARAMETERS THAT WILL CONSTRAIN THE CODE AT RUNTIME, I CAN'T TAILOR THE CODE TO THEM CAN'T TAILOR THE CODE TO THEM CLING CLING 4 . 2EXISTING SOLUTIONS - C++ EXISTING SOLUTIONS - C++ / / CLING CLING RUNTIME COMPILED C++ RUNTIME COMPILED C++ EASY-JIT EASY-JIT 4 . 2EXISTING SOLUTIONS - C++ EXISTING SOLUTIONS - C++

equivalent of their v-table at runtime, but that rarely happens in practice. Polymorphic Inline Caches record what actual types are seen, and check against the common cases at runtime. It’s a cute optimization reported in the literature. DPF’s performance is either equivalent to or, when it can exploit runtime information, superior to hand-coded demultiplexors. DPF achieves high performance by using a carefully-designed reported in the literature. DPF’s performance is either equivalent to or, when it can exploit runtime information, superior to hand-coded demultiplexors. DPF achieves high performance by using a carefully-designed