As we know function overloading is one of the core features of object-oriented languages. We can use the same name of the functions; whose parameter sets are different. Here we will see how to overload the constructors of C++ classes. The constructor overloading has few important concepts.
- Overloaded constructors must have the same name and different number of arguments
- The constructor is called based on the number and types of the arguments are passed.
- We have to pass the argument while creating objects, otherwise the constructor cannot understand which constructor will be called.
Example
#include <iostream>
using namespace std;
class Rect{
private:
int area;
public:
Rect(){
area = 0;
}
Rect(int a, int b){
area = a * b;
}
void display(){
cout << "The area is: " << area << endl;
}
};
main(){
Rect r1;
Rect r2(2, 6);
r1.display();
r2.display();
}
Output
The area is: 0 The area is: 12