copy constructor
A copy constructor is a special constructor in the C++ programming language for creating a new object as a copy of an existing object. The first argument of such a constructor is a reference to an object of the same type as is being constructed (const or non-const), which might be followed by parameters of any type (all having default values).
Example
#include <iostream>
using namespace std;
class Vehicle
{
public:
int wheels;
};
int main()
{
Vehicle Car;
Car.wheels = 4;
cout << "from object Car, car wheels are " << Car.wheels << endl;
Vehicle smallTruck(Car); // copy constructor
cout << "from copy constructor, small truck wheels are "
<< smallTruck.wheels << endl;
getchar();
return 0;
}
Output :
from object Car, car wheels are 4 from copy constructor, small truck wheels are 4
