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How to use const in C++

On the virtues of constness

Sandor Dargo

Learning how to use const in the correct way is inevitable if you want to become a seasoned C++ developer. This book will help you discover not only the basics but the less known implications of using const. Did you know that using it can even degrade performance in some cases? Read this book to get all the details!

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About

About

About the Book

Constness is such an important idea that in certain languages entities are const, in other words, immutable by default. If you want to become a seasoned C++ developer, you must understand how you can use const correctly. In this book, you'll learn when and how to use it in the different contexts it might appear:

  • const functions
  • const local variables
  • const member variables
  • const return types
  • const parameters

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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. 

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      Contents

      Table of Contents

      Introduction

      Arguments against using const

      1. const and visual noise
      2. const is confusing for the developer
      3. It doesn’t matter anyway
      4. Key takeaways

      const local variables

      1. Key takeaways

      const member variables

      1. Why would you want to have const members?
      2. Some unexpected implications
      3. Can we find a workaround?
      4. Key takeaways

      const functions

      1. Characteristics of const functions
      2. const overloads
      3. Key takeaways

      const return types

      1. Returning const objects by value
      2. Returning const references
      3. Return const pointers
      4. Key takeaways

      const parameters

      1. const primitve data type parameters
      2. const class type parameters
      3. Key takeaways

      const and smart pointers

      1. const and smart pointers as pointers
      2. const and smart pointers as objects
      3. Key takeaways

      const rvalue references

      1. What are rvalue references?
      2. Binding rules
      3. When to use const rvalue references?
      4. Key takeaways
      5. Further reading

      Summary

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