C++23 - The Complete Guide

It's out: C++23 - The Complete Guide by Nicolai M. Josuttis Giving guidance on how to use the new language and library features of C++23 For programmers, who already know C++ and want to switch to the brand new features of C++23 This book was written and published incrementally (step-by-step) at leanpub, so that you could benefit from it without waiting until all is done. The first public version was available in June 2026 and in September 2026 the book is done. It has over 500 pages with >180 example programs. Order the printed hardcover book with ISBN 978-3-96730-923-2 at your local bookstore or here Order the ebook at https://leanpub.com/cpp23

C++23 is the latest evolution in modern C++ programming, which is more and more supported by the latest versions of GCC, Clang, and Visual C++. C++23 is the first release after introducing several new key features with C++20, which can be seen as the beginning of a new release cycle. It contains both significant extensions and improvement of various features introduced with C++20 and a couple of new language and library features. As usual, not everything is self-explanatory, combining new features gives even more power, and there are hidden traps. This book presents all the new language and library features of C++23. It covers the motivation and context of each new feature with various examples and background information. The focus is on how these features impact day-to-day programming, what it means to combine them, and how to benefit from them in practice. Nicolai M. Josuttis is well known in the programming community for his authoritative books and talks. For more than 25 years he is a member of the C++ Standard Committee. He is the (co-)author of several worldwide best-sellers, including C++20 - The Complete Guide, all new language and library features of C++20 C++17 - The Complete Guide, all new language and library features of C++17 C++ Move Semantics - The Complete Guide, all aspects of move semantics in one book C++ Templates - The Complete Guide (with David Vandevoorde and Doug Gregor), the book about templates The C++ Standard Library, the book about the C++ Standard Library, first publication in 1999

The book is now available as printed book:

Topics and Content:

• New "Hello, World"
• Modules std and std.compat
• Formatted Output Extensions
  • std::print() and std::println()
  • Formatted output for collections, tuples, and pairs
  • Extended formatted output for strings
  • UTF-8 support
  • Implementing a range formatter
  • Concept formattable
  • Formatting thread IDs
• std::mdspan
  • Static, dynamic, and mixed extents
  • Different layout mappings (including invalid stride layouts)
  • Using accessors
• Multi-dimensional operator []
• std:expected<>
• Monadic operations for std::optional<> and std::expected<>
• std::stacktrace
• New features for ranges and views:
  • New Views
  • std::from_range and std::ranges::to<>()
  • Support for user-defined range adaptors
  • Improved const support
  • New issues with views
  • The Filter View Fiasco
• std::generator<> coroutine interface
• auto() and auto{}
• Deducing this as explicit object parameter
  • Recursive lambdas
  • The new CRTP pattern
    
• Span streams
• Flat Sets and Flat Maps
• if consteval
• Fixed range-based for loop
• Other small language features
  • New literal suffixes uz and z for std::size_t and its corresponding sized type
  • Preprocessor directives #elifdef, #elifndef, and #warning
  • Attribute [[assume(cond)]]
  • std::to_underlying() for enums
  • static operator() and operator[]
  • static lambdas
  • std::forward_like<>⁽⁾
  • std::start_lifetime_as() and std::start_lifetime_as_array() the type trait is_implicit_lifetime_v<>
    
• Other small library features
  • Container member functions to insert/assign ranges as a whole
  • resize_and_overwrite() member function for strings
  • contains() member function for strings
  • Algorithms std::ranges::contains(), std::ranges::contains_subrange()
  • Algorithms std::ranges::starts_with(), std::ranges::ends_with()
  • Algorithms std::ranges::find_last(), std::ranges::find_last_if(), and std::ranges::find_last_if_not()
  • Fold Algorithms std::ranges::fold_left(), std::ranges::fold_right(), std::ranges::fold_left_first(), ...
  • std::ranges versions of algorithms shift_left(), shift_right(), iota()
  • std::byteswap()
  • std::move_only_function<>
  • Type traits is_scoped_enum_v<>
  • std::unreachable()

Note that you can also book advanced taylored inhouse trainings about Modern C++ and C++23 (both the language and its standard library) and all other C++ topics. Contact me.