Virtual Base Class Example

#include <iostream>

using namespace std;

class A
{
public:
A()
{
cout << "A Class" << endl;
}
};

class B :virtual public A
{
public:
B()
{
cout << "B Class" << endl;
}
};

class C : virtual public A
{
public:
C()
{

cout << "C Class" << endl;

}
};

class D : public B,public C
{
public:
D()
{
cout << "D Class" << endl;
}
};

int main()

{

 D d;

return 0;

}

Output

A Class
B Class
C Class
D Class