Abstract
Some data types will be as much a part of your daily vocabulary as basic types such as int or double. You’ll use them everywhere, all the time: in your function signatures, in your algorithms, as member variables of your classes (see later), etc. We call such types vocabulary types. In modern C++, they are one of the cornerstones of understandable, maintainable, and safe code.
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Other such vocabulary types include std::variant<>, which replaces union types, and std::any, which replaces void* pointers. Because you’ll use these less frequently, we’ll leave these for you to discover as self-study later on. But don’t worry: once you know std::optional<>, figuring out how to use std::variant<> and std::any should be a walk in the park.
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© 2020 Ivor Horton and Peter Van Weert
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Horton, I., Van Weert, P. (2020). Vocabulary Types. In: Beginning C++20. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-5884-2_9
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DOI: https://doi.org/10.1007/978-1-4842-5884-2_9
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Publisher Name: Apress, Berkeley, CA
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Online ISBN: 978-1-4842-5884-2
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