All the new language and library features of C++23 (for those who know previous versions of C++). C++23 is the next evolution in modern C++ programming, now supported by major C++ compilers. This release contains both new few features and several extensions to C++20. As usual, not everything is self-explanatory and there are hidden traps. Therefore, it is key to learn all the concepts of C++23 and how to benefit best. This book covers the motivation for and context of all new C++23 features (covering both language and library) and provides many examples and unique background information for application programmers as well as for library developers. The focus is on how these features impact day-to-day programming, what effect combining features can have, and how you can benefit from the features in practice.