basic_string::resize_and_overwrite()  Monadic Operations for std::optional  Stacktrace Library  Changes to Ranges Library  Changes to Views Library  std::expected  std::move_only_function<>  std::spanstream basic_string::resize_and_overwrite()  Monadic Operations for std::optional  Stacktrace Library  Changes to Ranges Library  Changes to Views Library  std::expected  std::move_only_function<>  std::spanstream basic_string::resize_and_overwrite()  Monadic Operations for std::optional  Stacktrace Library  Changes to Ranges Library  Changes to Views Library  std::expected  std::move_only_function<>  std::spanstream

passed ISO voting, expected to be formally published by the end of 2020.4 Agenda  Modules  Ranges  Coroutines  Concepts  Lambda Expression Changes  [=, this] as Lambda Capture  Templated September 18 • 12:00Ranges11 Ranges  What’s a range?  An object referring to a sequence/range of elements  Similar to a begin/end iterator pair, but does not replace them  Why ranges?  Provide nicer sort(begin(data), end(data)); ranges::sort(data);  Eliminate mismatching begin/end iterators  Allows “range adaptors” to lazily transform/filter underlying sequences of elements12 Ranges  Based on following

static constexpr array skipped_extensions{".dll"sv, ".exe"sv, ".obj"sv}; static_assert(ranges::is_sorted(skipped_extensions)); for (const auto& ent : filesystem::recursive_directory_iterator{" rator{"."}) { const string extension = ent.path().extension().string(); if (ranges::binary_search(skipped_extensions, extension)) { continue; } // ... argument • This constructor is powered by C++20 ranges! • Specifically ranges::contiguous_range (and more) • Extensible to user-defined contiguous ranges25 And More!26 So Many New Features, Including:

Structured concurrency Cancellation support in sender/receiver Extended example: Sender/receiver and ranges52 ADDITIONAL RESOURCES P2300R2: “std::execution”: https://wg21.link/P2300R2 Libunifex: https://github processInput() ), userInterrupt() );79 AN EXTENDED EXAMPLE: SENDERS, COROUTINES, AND RANGES, OH MY!But first, a sad story about a boy and ☹ the greatest keyboard ever made….82 The mission: to imagine one might want to apply a range adaptor to the results of the senders. Asynchronous ranges beg asynchronous range adaptors.102 Step 3: Model Ctrl-C as a sender103 struct ctrl_c_handler

MSVC Miya Natsuhara – `Online _4 Tue, Oct 26 – 10:30am Documentation in The Era of Concepts and Ranges Sy Brand, Christopher Di Bella – `Online _3 Mon, Oct 25 – 3:15pm Implementing C++ Modules: Lessons Community 🏆 Top suggestion tickets implemented • C++ IntelliSense Support for C++20 Concepts and Ranges libraries • Build a subset of CMake targets with CMakePresets.json • Leverage IntelliSense in CMake Abandoned – Cameron DaCamara & Gabriel Dos Reis Tuesday 26th • Documentation in The Era of Concepts and Ranges – Sy Brand & Christopher Di Bella (Google) • Static Analysis and Program Safety in C++: Making

矩阵库（附带一些常用函数，随机数生成等） 4. Tencent/rapidjson - 单纯的 JSON 库，甚至没依赖 STL （可定制性高，工程美学经典） 5. ericniebler/range-v3 - C++20 ranges 库就是受到他启发（完全是头文件组成） 6. fmtlib/fmt - 格式化库，提供 std::format 的替代品（需要 -DFMT_HEADER_ONLY ） 7. gabime/spdlog - 格式化库，提供 std::format 的替代品 2. gabime/spdlog - 能适配控制台，安卓等多后端的日志库 3. ericniebler/range-v3 - C++20 ranges 库就是受到他启发 4. g-truc/glm - 模仿 GLSL 语法的数学矢量 / 矩阵库 5. abseil/abseil-cpp - 旨在补充标准库没有的常用功能 6. bombela/backward-cpp

– Cameron DaCamara & Gabriel Dos Reis Tuesday 26th • Documentation in The Era of Concepts and Ranges – Sy Brand & Christopher Di Bella (Google) • Static Analysis and Program Safety in C+ +: Making

– Cameron DaCamara & Gabriel Dos Reis Tuesday 26th • Documentation in The Era of Concepts and Ranges – Sy Brand & Christopher Di Bella (Google) • Static Analysis and Program Safety in C+ +: Making

当代： C++17 CTAD / compile-time argument deduction / 编 译期参数推断 当代： C++17 引入常用数值算法 未来： C++20 引入区间（ ranges ） https://zhuanlan.zhihu.com/p/350068132 未来： C++20 引入模块（ module ） https://zhuanlan.zhihu.com/p/350136757