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Modern C++ Programming Cookbook

You're reading from   Modern C++ Programming Cookbook Master Modern C++ with comprehensive solutions for C++23 and all previous standards

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Product type Paperback
Published in Feb 2024
Publisher Packt
ISBN-13 9781835080542
Length 816 pages
Edition 3rd Edition
Languages
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Author (1):
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Marius Bancila Marius Bancila
Author Profile Icon Marius Bancila
Marius Bancila
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Toc

Table of Contents (15) Chapters Close

Preface 1. Learning Modern Core Language Features 2. Working with Numbers and Strings FREE CHAPTER 3. Exploring Functions 4. Preprocessing and Compilation 5. Standard Library Containers, Algorithms, and Iterators 6. General-Purpose Utilities 7. Working with Files and Streams 8. Leveraging Threading and Concurrency 9. Robustness and Performance 10. Implementing Patterns and Idioms 11. Exploring Testing Frameworks 12. C++ 20 Core Features 13. Other Books You May Enjoy
14. Index

Chaining together computations that may or may not produce a value

In the previous recipe, we have seen how to use the std::optional class for storing a value that may or may not exist. Its use cases include optional parameters to functions and return values from functions that may fail to produce a result. When multiple such functions need to be chained together, the code can become cumbersome and verbose. For this reason, the C++23 standard has added several new methods to the std::optional class. They are referred to by the term monadic operations. These methods are transform(), and_then(), and or_else(). In this recipe, we’ll see what they are useful for.

In simple terms, in functional programming, a monad is a container that encapsulates some functionality on top of a value that it wraps. Such an example is std::optional in C++. On the other hand, a monadic operation is a function from a domain D into D itself. For instance, the identity function (a function...

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