Book Image

C++ Fundamentals

By : Antonio Mallia, Francesco Zoffoli
Book Image

C++ Fundamentals

By: Antonio Mallia, Francesco Zoffoli

Overview of this book

C++ Fundamentals begins by introducing you to the C++ compilation model and syntax. You will then study data types, variable declaration, scope, and control flow statements. With the help of this book, you'll be able to compile fully working C++ code and understand how variables, references, and pointers can be used to manipulate the state of the program. Next, you will explore functions and classes — the features that C++ offers to organize a program — and use them to solve more complex problems. You will also understand common pitfalls and modern best practices, especially the ones that diverge from the C++98 guidelines. As you advance through the chapters, you'll study the advantages of generic programming and write your own templates to make generic algorithms that work with any type. This C++ book will guide you in fully exploiting standard containers and algorithms, understanding how to pick the appropriate one for each problem. By the end of this book, you will not only be able to write efficient code but also be equipped to improve the readability, performance, and maintainability of your programs.
Table of Contents (9 chapters)
C++ Fundamentals

Virtual Methods

We've learned the advantages of dynamic dispatch in C++ and how it can enable us to execute the methods of a derived class by calling a method on a reference or pointer to a base class.

In this section, we will take an in-depth look at how to tell the compiler to perform dynamic dispatch on a method. The way to specify that we want to use dynamic dispatch for a method is to use the virtual keyword.

The virtual keyword is used in front of a method when declaring it:

class Vehicle {
    virtual void turnOn();

We need to remember that the compiler decides how to perform method dispatch based on the static type of the variable that is used when calling the method.

This means that we need to apply the virtual keyword to the type we are using in the code. Let's examine the following exercise to explore the virtual keyword.

Exercise 22: Exploring the Virtual Method

Let's create a program using the concept of inheritance using the virtual keyword:

  1. First, make sure to add the...