📘 Lesson · Lesson 69

Copy Constructor

What is a Copy Constructor?

💡 Note

A copy constructor creates a new object as a copy of an existing object.

Example

C++

#include <iostream>
using namespace std;
class Point {
public:
    int x;
    Point(int x) { this->x = x; }
    Point(const Point &p) { x = p.x; }   // copy constructor
};
int main() {
    Point a(5);
    Point b = a;   // copy constructor called
    cout << b.x;   // 5
    return 0;
}

Output:
5

Types of Constructors

Default — no parameters.
Parameterized — takes arguments.
Copy — copies another object.

Summary

A copy constructor takes a reference to the same class and copies its data.
Three types: default, parameterized, copy.

a Copy Constructor क्या है?

💡 Note

A copy constructor creates a new object as a copy of an existing object.

Example

C++

#include <iostream>
using namespace std;
class Point {
public:
    int x;
    Point(int x) { this->x = x; }
    Point(const Point &p) { x = p.x; }   // copy constructor
};
int main() {
    Point a(5);
    Point b = a;   // copy constructor called
    cout << b.x;   // 5
    return 0;
}

Output:
5

Types of Constructors

Default — no parameters.
Parameterized — takes arguments.
Copy — copies another object.

सारांश

A copy constructor takes a reference to the same class and copies its data.
Three types: default, parameterized, copy.

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