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C++ Concepts

Validate your templates compile-time

Sandor Dargo

You are going to discover why templates as-is are not enough and how concepts came to the rescue. You are going to learn about how to use them in four different ways with functions, how to use them with classes, what kind of concepts are already delivered with the standard library and how to write new ones from scratch.

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About

About the Book

In this book, you are going to discover one of the flagship features of C++20, concepts.

You will learn about:

  • the motivations behind concepts
  • the 4 ways to use them with functions
  • 3 different ways to use them with classes
  • what kind of concepts are shipped with the standard library
  • how to write your own concepts from scratch
  • some real-life examples

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C and C++

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Author

About the Author

Sandor Dargo

I am a C++ software craftsman with strong Python working in the tourism and hospitality industry and an enthusiastic blogger writing about coding, books, and the importance of stoic philosophy in a software developer's life.

I moved to software development from database operations which means that I don't just care about delivering a product as fast as possible, but I do understand the importance of stability and maintainability.

I'm passionate about delivering clean solutions, but I find even more important to help my teams to constantly raise the bar and to (re)focus on quality and clean code. I do this by explaining how high-quality work will help them in their individual careers, by introducing more meaningful development processes and automation and by teaching them industry best practices. 

Contents

Table of Contents

Introduction

  1. Why not a full reference with all the details?
  2. Why concepts and not something else? Why not a full review of C++20?

The concept behind C++ concepts

  1. The motivation behind concepts
  2. Key takeaways

4 ways to use concepts in functions

  1. The 4 ways to use concepts
  2. They are all compiled the same way
  3. How to choose among the 4 ways?
  4. Conclusion

C++ concepts with classes

  1. The requires clause
  2. Constrained template parameters
  3. The trailing requires clause
  4. Conclusion

Concepts shipped with the C++ standard library

  1. Concepts in the <concepts> header
  2. Concepts in the <iterator> header
  3. Concepts in the <ranges> header
  4. Conclusion

How to write your own C++ concepts?

  1. The simplest concept
  2. Use already defined concepts
  3. !a is not the opposite of a
  4. Negations come with parentheses
  5. Subsumption and negations
  6. Requirements on operations
  7. Simple requirements on the interface
  8. Requirements on return types (a.k.a compound requirements)
  9. Type requirements
  10. Nested requirements
  11. Conclusion

How to use C++ concepts in real life?

  1. Numbers finally
  2. Utility functions constrained
  3. Multiple destructors with C++ concepts
  4. Conclusion

Summary

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