C++ Concepts
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C++ Concepts

Validate your templates compile-time

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

About the Author

Sandor Dargo
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. 

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Table of Contents

  • Introduction
    • Why not a full reference with all the details?
    • Why concepts and not something else? Why not a full review of C++20?
  • The concept behind C++ concepts
    • The motivation behind concepts
  • 4 ways to use concepts in functions
    • The 4 ways to use concepts
    • They are all compiled the same way
    • How to choose among the 4 ways?
  • C++ concepts with classes
    • The requires clause
    • Constrained template parameters
    • The trailing requires clause
  • Concepts shipped with the C++ standard library
    • Concepts in the <concepts> header
    • Concepts in the <iterator> header
    • Concepts in the <ranges> header
  • How to write your own C++ concepts?
    • The simplest concept
    • Use already defined concepts
    • !a is not the opposite of a
    • Negations come with parentheses
    • Subsumption and negations
    • Requirements on operations
    • Simple requirements on the interface
    • Requirements on return types (a.k.a compound requirements)
    • Type requirements
    • Nested requirements
  • How to use C++ concepts in real life?
    • Numbers finally
    • Utility functions constrained
    • Multiple destructors with C++ concepts
  • Summary

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