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

Learn to use Deleted Implicitly-Declared Default 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.

There are different contractor types and the Default Constructor in classes is one of these. This method not only used in classes but also used with struct and union data types Do you want to learn what is default constructor or what kind of methods we have that we can declare and use default constructors? In this post, we will try to explain the Default Constructor with examples.

Default Constructor is a constructor type in Classes that is called when class is defined with no arguments, or it is defined with an empty parameter list, or with default arguments provided for every parameter. A type with a public default constructor is Default Constructible; There are different methods to use this Default Constructor and one of these is using a Deleted Implicitly-Declared Default Constructor. If you are looking for how do we use Deleted Implicitly-Declared Default Constructor implicitly, here are details.

Deleted Implicitly-Declared Default Constructor

In C++ programming, If there is a declared default constructor, we can force the automatic generation of a default constructor in a new class by the compiler that would be implicitly declared otherwise with the keyword default. If we don’t define a constructor in a class and the implicitly-declared default constructor is not trivial, we can inhibit the automatic generation of an implicitly-defined default constructor by the compiler with the keyword delete.

Here is an Implicitly-Declared Default Constructor example that gives Error,

We have error because it is deleted.

Get started building powerful apps with C++Builder!

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

Dr. Yilmaz Yoru has 35+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux, and some other operating systems. He graduated and received his MSc and PhD degrees from the Department of Mechanical Engineering of Eskisehir Osmangazi University. He is the founder and CEO of ESENJA LLC Company. His interests are Programming, Thermodynamics, Fluid Mechanics, Artificial Intelligence, 2D & 3D Designs, and high-end innovations.
Related posts
C++C++11C++14C++17C++20Learn C++

What Is The Priority Queue (std::priority_queue) In Modern C++?

C++C++11C++14C++17C++20

What Is The Stack (std::stack) In Modern C++?

C++C++11C++14C++17C++20Learn C++

What Is The Queue (std::queue) In Modern C++?

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

What Are The Logical Operation Metafunctions In Modern C++?

Worth reading...
Learn about Declaration of a Default Constructor Inside of Class Definition