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

The given function doesn’t modify the member variables.

The given function doesn’t call other non-`const` member functions of the same object.

The given function cannot call any variable.

What does the constness of a function signal to the reader and the compiler?


What does the constness of a function signal to the reader and the compiler?

It gives hints to the compiler where to perform optimizations.

It prevents accidental modifications of the underlying object.

How does using `const` functions help the compiler? Select all that apply.

How does using <code>const</code> functions help the compiler? Select all that apply.

Can we call a non-`const` function of another object from a `const` function?


Can we call a non-<code>const</code> function of another object from a <code>const</code> function?

What kind of functions can be declared `const`?

What kind of functions can be declared <code>const</code>?

Assuming that we are working with C++17 and we have a non-`const` instance of object `MyInt` called `myInt`, how can we call the `const` overload of the function foo()?

Assuming that we are working with C++17 and we have a non-<code>const</code> instance of object <code>MyInt</code> called <code>myInt</code>, how can we call the <code>const</code> overload of the function foo()?

Whenever possible and the code compiles so.

When the function returns a `const` variable. 

When should we make a member function `const`?

When should we make a member function <code>const</code>?

Here's a short quiz to test your understanding.

Introduction

Arguments using const

Local Variables

Local Members

Functions

Return Types

const Parameters

const and Smart Pointers

Rvalue References

Summary

Quiz