{"id":35102,"date":"2025-02-11T18:58:57","date_gmt":"2025-02-11T18:58:57","guid":{"rendered":"https:\/\/devblogs.microsoft.com\/cppblog\/?p=35102"},"modified":"2025-02-11T18:58:57","modified_gmt":"2025-02-11T18:58:57","slug":"whats-new-for-c-developers-in-visual-studio-2022-17-13","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/cppblog\/whats-new-for-c-developers-in-visual-studio-2022-17-13\/","title":{"rendered":"What\u2019s New for C++ Developers in Visual Studio 2022 17.13"},"content":{"rendered":"

We are happy to announce that Visual Studio 2022 version 17.13 is now generally available! This post summarizes the new features you can find in this release for C++. You can download Visual Studio 2022 from the\u00a0Visual Studio downloads page\u00a0<\/a>or upgrade your existing installation by following the\u00a0Update Visual Studio Learn page<\/a>.<\/p>\n

Standard Library and Compiler<\/h2>\n

On the compiler side, we\u2019ve implemented C++23\u2019s size_t<\/code> literal suffix. The suffix uz<\/code> or UZ<\/code> (or any permutation of these) will help you avoid sneaky truncations or signed comparison mismatches, especially when writing loops. For example:<\/p>\n

\/\/Infinite loop if v.size > max unsigned int\r\nfor (auto i = 0u; i < v.size(); ++i) {\r\n    \/\/Use v and v[i]\r\n}\r\n\r\n\/\/Fine due to uz literal\r\nfor (auto i = 0uz; i < v.size(); ++i) {\r\n    \/\/Use v and v[i]\r\n}<\/code><\/pre>\n
Note that, while this feature is available in our MSVC compiler, it is not yet supported in the EDG compiler that powers IntelliSense, so you may see red squiggles in your editor until support is added.<\/p>\n
For all of the compiler improvements shipped in VS 2022 17.13, see MSVC Compiler Updates in Visual Studio 2022 version 17.13<\/a>.<\/p>\n
Our standard library has too many improvements to list in this blog post, so check out the changelog<\/a> for all the details. Thanks to everyone in the community who contributed to this release! I\u2019ve picked out some highlights below.<\/p>\n
The feature I\u2019m most excited about is std::generator<\/code>. This brings some long-awaited standard library support for coroutines. A little example from the paper<\/a>:<\/p>\n
std::generator<int> fib() {\r\n    auto a = 0, b = 1;\r\n    while (true) {\r\n        co_yield std::exchange(a, std::exchange(b, a + b));\r\n    }\r\n}\r\n\r\nint answer_to_the_universe() {\r\n    auto rng = fib() | std::views::drop(6) | std::views::take(3);\r\n    return std::ranges::fold_left(std::move(rng), 0, std::plus{});\r\n}<\/code><\/pre>\n
The fib<\/code> function is a coroutine (because it uses the co_yield<\/code> keyword). Whenever the co_yield<\/code> statement is executed, fib<\/code> is suspended and the value is returned to the caller. The fib<\/code> coroutine can then be resumed later to produce more values, without requiring any manual state handling from the programmer. As you can see from the next function, std::generator<\/code> is compatible with ranges, so we can pipe it into some range adaptors from the standard library.<\/p>\n
Also in the area of conformance, we implemented two papers that improve the performance of std::print<\/code>: P3107R5<\/a> and P3235R3<\/a>.<\/p>\n
We\u2019ve improved the build throughput of <queue><\/code>, <stack><\/code>, <stacktrace><\/code>, and <thread><\/code> by not including all of <format><\/code>.\u00a0For the same reason, we\u2019ve moved system_clock<\/code>,\u00a0high_resolution_clock<\/code>, and\u00a0chrono_literals<\/code>\u00a0from a commonly-included internal header to\u00a0<chrono><\/code>. This has source-breaking impact. If you see compiler errors complaining that it doesn’t recognize\u00a0chrono\u00a0types like\u00a0system_clock<\/code>\u00a0or UDLs like\u00a01729ms<\/code>, you need to include\u00a0<chrono><\/code>\u00a0specifically, instead of assuming that headers like\u00a0<thread><\/code>\u00a0will drag it in.<\/p>\n
We have also continued our work in improving vectorization across the standard library. This release comes with improvements for the following types and functions:<\/p>\n