{"id":9830,"date":"2024-08-12T08:16:49","date_gmt":"2024-08-12T08:16:49","guid":{"rendered":"https:\/\/www.modernescpp.com\/?p=9830"},"modified":"2024-08-12T09:28:36","modified_gmt":"2024-08-12T09:28:36","slug":"c23-this-and-that","status":"publish","type":"post","link":"https:\/\/www.modernescpp.com\/index.php\/c23-this-and-that\/","title":{"rendered":"C++23: This and That"},"content":{"rendered":"\n

I have already written 10 posts about C++23. Today, I want to discuss the features I forgot in the first round.<\/p>\n\n\n\n

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As a short reminder, here are the main C++23 features.<\/p>\n\n\n\n

Main C++23 Features<\/h2>\n\n\n\n

C++23 offers with deducing this a small but very impactful feature of the core language. Deducing this allows you, similar to Python, to make the implicitly passed this pointer in a member function definition explicit. Thanks to deducing this, a few complex techniques in C++, such as CRTP or the Overload Pattern, will become a piece of cake.<\/p>\n\n\n\n

The C++23 library will get many impactful additions. You can directly import the standard library with import std;,<\/code> or apply the C++20 format string in std::print<\/code> and std::println<\/code>. Additionally, we will get flat associative containers such as std::flat_map<\/code> for performance reasons. std::flap_map<\/code> is a drop-in replacement for std::map<\/code>. std::optional<\/code> interface is extended with a monadic interface for composability. The new data type std::expected<\/code> already has a composable interface and can store an expected or an unexpected value for error handling. Thanks to std::mdspan<\/code>, we will get a multidimensional span. Finally, std::generator<\/code> is the first concrete coroutine for creating a stream of numbers. std::generator<\/code> is part of the ranges library, which will also be improved in C++23.<\/p>\n\n\n\n

If you need more details, read my previous posts.<\/p>\n\n\n\n

Core Language<\/p>\n\n\n\n

    \n
  1. C++23: Deducing This<\/a><\/li>\n\n\n\n
  2. C++23: Syntactic Sugar with Deducing This<\/a><\/li>\n\n\n\n
  3. C++23: The Small Pearls in the Core Language<\/a><\/li>\n\n\n\n
  4. C++23: More Small Pearls<\/a><\/li>\n<\/ol>\n\n\n\n

    Library<\/p>\n\n\n\n

      \n
    1. C++23: A Modularized Standard Library, std::print and std::println<\/a><\/li>\n\n\n\n
    2. Range Improvements with C++23<\/a><\/li>\n\n\n\n
    3. C++23: A New Way of Error Handling with std::expected<\/a><\/li>\n\n\n\n
    4. C++23: A Multidimensional View<\/a><\/li>\n\n\n\n
    5. C++23: Range Improvements and std::generator<\/a><\/li>\n<\/ol>\n\n\n\n

      This is not all.<\/p>\n\n\n\n

      Fixed Width Floating Point Types<\/h2>\n\n\n\n

      So far, C++ supports the following floating point types: <\/p>\n\n\n\n