C++20 is the next big C++ standard after C++11. As C++11 did it, C++20 changes the way we program modern C++. This change is, in particular, due to the big four of C++20: ranges, coroutines, concepts, and modules.

C++20

Preface

About C++

The C++ standardization process is democratic. The committee is called WG21 (Working Group 21) and was formed in 1990-91. The officers of WG 21 are:

Standardization

Before I dive into the details of C++20, I want to give a quick overview of the features in C++20. This overview should serve two purposes; to give a first impression, and to provide links to the relevant sections you can use to dive directly into the details. Consequently, this chapter has only code snippets, but no complete programs.

A Quick Overview of C++20

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The Details - Core Language

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The Standard Library

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Concurrency

After providing the theory to C++20, I now apply the theory in practice and provide you with a few case studies.

Case Studies

Further Information

The header  allows you to ask your compiler for its C++11 or later support. You can ask for attributes, features of the core language, or the library.  has about 200 macros defined, which expand to a number when the feature is implemented. The number stands for the year and the month in which the feature was added to the C++ standard. These are the numbers for static_assert , lambdas, and concepts.

Feature Testing

The idea of this glossary is by no means to be exhaustive but to provide a reference for the essential terms.

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