Book Image

Beginning C++ Programming

By : Richard Grimes
Book Image

Beginning C++ Programming

By: Richard Grimes

Overview of this book

C++ has come a long way and is now adopted in several contexts. Its key strengths are its software infrastructure and resource-constrained applications, including desktop applications, servers, and performance-critical applications, not to forget its importance in game programming. Despite its strengths in these areas, beginners usually tend to shy away from learning the language because of its steep learning curve. The main mission of this book is to make you familiar and comfortable with C++. You will finish the book not only being able to write your own code, but more importantly, you will be able to read other projects. It is only by being able to read others' code that you will progress from a beginner to an advanced programmer. This book is the first step in that progression. The first task is to familiarize you with the structure of C++ projects so you will know how to start reading a project. Next, you will be able to identify the main structures in the language, functions, and classes, and feel confident being able to identify the execution flow through the code. You will then become aware of the facilities of the standard library and be able to determine whether you need to write a routine yourself, or use an existing routine in the standard library. Throughout the book, there is a big emphasis on memory and pointers. You will understand memory usage, allocation, and access, and be able to write code that does not leak memory. Finally, you will learn about C++ classes and get an introduction to object orientation and polymorphism.
Table of Contents (11 chapters)

Introducing polymorphism

Polymorphism comes from the Greek for many shapes. So far, you have a basic form of polymorphism. If you use a base class pointer to an object, then you can access the base class behavior, and if you have a derived class pointer, you get the derived class behavior. This is not as trivial as it appears because the derived class can implement its own version of the base class methods, so you can have a different implementation of that behavior.

You can have more than one class derived from a base class:

    class base { /*members*/ }; 
class derived1 : public base { /*members*/ };
class derived2 : public base { /*members*/ };
class derived3 : public base { /*members*/ };

Since C++ is strongly typed, it means that a pointer to one derived class cannot be used to point to another derived class. So you cannot use a derived1* pointer to access an...