Gain insights into the C++ keyword 'const,' its usage in various contexts, and implications when returning pointers and references. Learn about preventing accidental data changes.

How to use const in C++ by Sándor Dargo_468 x 60 copy.png

In this course, you will learn about the C++ keyword const and its behaviour under different usage conditions, including local, global and static contexts. This course will help you to understand const and its implications when you attempt to return pointers and references in C++. By the end of the course, you will have a solid grip on const and its usage in preventing any accidental change of data.

Secure Coding Practices in C++: A Deep Dive into const

While declaring local variables `const` is desirable, let’s avoid declaring member variables as `const`.

* `const` member variables cannot be changed, so a class with `const` members loses copy assignment and move semantics.
* Using `const_cast` might lead to undefined behaviour, so we won’t use it as a workaround in the above mentioned special functions.
* Whenever we see `const` members in a class during a code review (or in already checked-in code), remember what we just learned.


Get a recap of all the concepts learned in this chapter.

Introduction

Arguments using const

Local Variables

Local Members

Functions

Return Types

const Parameters

const and Smart Pointers

Rvalue References

Summary

Key Takeaways