My book C++20 is both: a tutorial and a reference for the C++20 standard. It teaches you C++20 and provides you with the details of this new thrilling C++ standard. The thrilling factor is mainly due to the big four of C++20.

• Concepts change the way we think and program templates. They are semantic categories for the template parameters and enable you to express your intention directly in the type system. If something goes wrong, you get a clear error message.
• The new ranges library enables it to perform algorithms directly on the container, compose the algorithm with the pipe symbol, and apply them to infinite data streams.
• Thanks to coroutines, asynchronous programming in C++ becomes mainstream. Coroutines are the base for cooperative tasks, event loops, infinite data streams, or pipelines.
• Modules overcome the restrictions of header files. They promise a lot. For example, the separation of header and source files becomes as obsolete as the preprocessor. In the end, we have faster built time and an easier way to build packages.

• C++11 and C++14 have the basic building blocks for creating concurrent or parallel programs.
• With C++17, we got the parallel algorithms of the Standard Template Library (STL). That means, most of the algorithms of the STL can be executed sequential, parallel, or vectorized.
• The concurrency story in C++ goes on. With C++20, we got coroutines, atomic smart pointers, semaphores, and latches and barriers.
• With C++23, we can hope for executors, extended futures, transactional memory, and more.

This book explains the details of concurrency in modern C++ and gives you, also, nearly 200 running code examples. Therefore, you can combine the theory with the practices and get the most of it.

Because this book is about concurrency, I present many pitfalls and show you how to overcome them.

The book is 100 % finished, but I will update it from time to time. The next update is probably about C++23. Furthermore, I will start the chapter on lock-free data structures.

The C++ Standard Library is a reference to the C++ standard library based on C++20.

The Goal

The goal of The C++ Standard Library is to provide you a concise reference of the C++ standard library in about 300 pages. his book assumes that you are familiar with C++. If so, you will get the most benefit from this book. If C++ is new to you, you should start with a textbook about core C++. Once you have mastered a textbook about the core language, you can make your next big step by reading my book.

This book has, also, more than 100 running code examples to the code snippets I presented in the book. Therefore you can combine the theory with the practices and get the most of it.

Many Thanks

In particular, I thank the English proofreaders of my book: Mahesh Attarde, Rick Audet, Pete Barrow, Michael Ben-David, Dave Burns, Juliette Grimm, Marius Grimm, Alvaro Fernandez, George Haake, Clare Macrae, Arne Mertz, Ian Reeve, Jason Turner, Bart Vandewoestyne, Ivan Vergiliev, and Andrzej Warzynski. They translated my Swabian English into English. Without their work, the book wouldn't have been possible.