Copy constructor vs Default Copy constructor vs Deficiencies of Default Copy Constructors

Copy Constructor

A copy constructor is a special constructor that's used when a new object is made and set up with the data from another object of the same class.

E.g

Class_name obj1(12);

Class_name obj2=obj1;

For example, if Ali and Khalid share the same hostel and a room object for Ali has already been created, it makes sense to initialize Khalid's room object to a copy of Ali's. In particular, suppose we have the following class to represent hostel rooms:

When we create an object and set it up with the data from another object of the same class, a special constructor called a copy constructor is automatically called by the compiler. This copy constructor copies the data from the existing object to the new one. Sometimes, we can define our own copy constructor if needed. as we will discuss below.

First, let me differentiate both user-defined and default copy constructors

In C++, when you don't define a copy constructor explicitly, the compiler generates a default copy constructor for you. The default copy constructor performs a memberwise copy of the data from one object to another, just like a user-defined copy constructor would do if you had written it explicitly.

User-defined copy constructor: You write the copy constructor explicitly in your code to define how you want the copying process to be done.

// User-defined copy constructor

  MyClass(const MyClass &other){

data=other.data//

}

user-defined copy constructor

Default Copy Constructor