point.comC++ Copy Constructor
A copy constructor is used when the compiler has to create a temporary object of a class object.
The constructor can have any number of the parameters of the class may have a number of constructors overloaded.
The following situations Copy constructor used:-
- The initialization of an object by another object of the same class.
- Return of objects as function value.
- Stating the object as by value parameter of a function.
Syntax:
class_name(class_name &ptr)
Example:
#include <iostream>
using namespace std;
class circle
{
public:
int area;
circle(int radius)
{
area=3.14 * radius * radius;
}
circle(circle &ci) // copy constructor
{
area = ci.area;
}
};
int main()
{
circle c(20);
cout << "Area of Circle: " << c.area << endl;
circle c1(c); // Calling the copy constructor.
cout << "Area of Circle: " << c1.area;
return 0;
}
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