C++C++11C++14C++17Introduction to C++Learn C++

What You Need To Know About Virtual Destructors In C++ Apps

Destructors are not only used in classes but also used with struct and union data types. When you construct an object, sometimes you need operations to deconstruct. Do you want to learn what is Virtual Destructor or what kind of methods we have that we can declare and use a virtual destructor? In this post, we will try to explain how to use Virtual Destructor in your C++ apps.

What is a C++ Constructor?

The Constructor in C++ is a function, a method in the class, but it is a ‘special method’ that is automatically called when an object of a class is created. We don’t need to call this function. Whenever a new object of a class is created, the Constructor allows the class to initialize member variables or allocate storage. This is why the name Constructor is given to this special method. Here is a simple constructor class example below,

What is a C++ Destructor?

The Destructor in classes (i.e class_name) is a special member function to delete objects, in other terms it is called when the lifetime of an object ends. The purpose of the destructor is to do operations when destruct the object. The object may have acquired or allocated data on memory on runtime, they need to be freed too when objects are being deleted, destructor is the function that frees the resources of the object. When we construct an object, sometimes we need operations to deconstruct. Destructors are not only used in classes but also used with struct and union data types.

What is a Virtual Destructor in C++?

in C++The Destructor in classes (i.e. class_name) is a special member function to delete objects, in other terms it is called when the lifetime of an objects ends. The purpose of the destructor is to do operations when destruct the object. Object may have acquired or allocated data on memory on runtime, they need to be freed too when objects are being deleted, destructor is the function that free the resources of object.

Virtual Destructor is usually required in a base class, and it is used by the class which has this base class. Note that, deleting a class object through pointer to base invokes undefined behavior unless the destructor in the base class is virtual:

Syntax,

Virtual destructor declaration example in a class,

An example to virtual destructor in C++,

close

Oh hi there 👋
It’s nice to meet you.

Sign up to receive awesome C++ content in your inbox, every day.

We don’t spam! Read our privacy policy for more info.


Reduce development time and get to market faster with RAD Studio, Delphi, or C++Builder.
Design. Code. Compile. Deploy.
Start Free Trial

Free C++Builder Community Edition

About author

33+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux and some other operating systems. Dr. Yilmaz Yoru was born in 1974, Eskisehir-Turkey. He graduated from the department of Mechanical Engineering of Eskisehir Osmangazi University in 1997. One year later he started to work in the same university as an assistant. He received his MSc and PhD degrees from the same department of the same university. He has married and he is a father of a son. Some of his interests are Programming, Thermodynamics, Fluid Mechanics and Artificial Intelligence. He also likes the graphical 2D & 3D design and high-end innovations.
Related posts
C++C++11C++14C++17Introduction to C++Learn C++

This Is How To Join Two Wide Strings In Modern C++ Software

C++C++11C++14C++17Learn C++

How To Use The All-Powerful swscanf function In Your C++ App

C++ComponentsLanguage FeatureLearn C++

How To Use A Sharpen Effect in C+ Software On Windows?

C++C++11C++14C++17Introduction to C++Learn C++

What Is The Erase WString Method In A Modern C++ App

Worth reading...
::: Learn Destructors in C++ Classes