Chapter 9 Classes: A Deeper Look

In this chapter of 'C++ How to Program' by Deitel & Deitel, we delve deeper into the world of classes in C++. In particular, we explore the concept of constant objects and const member functions.

If a class object is not declared as `const`, the compiler will use the non-const version of an overloaded member function. On the other hand, if the object is declared as `const`, the compiler will use the const version of the function. This is determined by the object on which the function is invoked.

One important aspect of const objects and const member functions is that a function specified as `const` cannot modify the object it is called upon. This is because a `const` object specifies that an object is not modifiable, and any attempt to modify such an object will result in a compilation error.

In addition, only const member functions can be called for const objects. This means that if you try to call a non-const member function on a const object, the compiler will raise an error.

The use of `const` objects and const member functions is crucial in good software engineering principles, particularly when it comes to abstract data types. By allowing access to data only when it is absolutely needed, we can ensure that our code is more secure and maintainable.

In the following sections, we will explore further examples of using `const` objects and const member functions in C++ programming.

Chapter 9 classes a deeper look