Virtual base classes. : virtual function « Class « C++






  1. C++
  2. Class
  3. virtual function

Virtual base classes.

   
#include <iostream>
using namespace std;
   
class base {
public:
  int i;
};
   
// derived1 inherits base as virtual.
class derived1 : virtual public base {
public:
  int j;
};
   
// derived2 inherits base as virtual.
class derived2 : virtual public base {
public:
  int k;
};
   
class derived3 : public derived1, public derived2 {
public:
  int sum;
};
   
int main()
{
  derived3 ob;
   
  ob.i = 10; // now unambiguous
  ob.j = 20;
  ob.k = 30;
   
  // unambiguous
  ob.sum = ob.i + ob.j + ob.k;
   
  // unambiguous
  cout << ob.i << " ";
   
  cout << ob.j << " " << ob.k << " ";
  cout << ob.sum;
   
  return 0;
}








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