© Ivor Horton and Peter Van Weert 2018
Ivor Horton and Peter Van WeertBeginning C++17https://doi.org/10.1007/978-1-4842-3366-5_18

18. First-Class Functions

Ivor Horton1  and Peter Van Weert2
Stratford-upon-Avon, Warwickshire, UK
Kessel-Lo, Belgium

In C++, you have economy-class functions, business-class functions, and first-class functions, all with varying degrees of comfort, space, privacy, and onboard service…no, of course that’s not what the term first-class means.1 We’re just kidding. Let’s start over:

In computer science, a programming language is said to offer first-class functions if it allows you to treat functions like any other variable. In such a language, for instance, you can assign a function as a value to a variable, just like ...

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