A base class reference is used to access a virtual function : virtual function « Class « C++

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

A base class reference is used to access a virtual function

   
#include <iostream>
using namespace std;
   
class base {
public:
  virtual void vfunc() {
    cout << "This is base's vfunc().\n";
  }
};
   
class derived1 : public base {
public:
  void vfunc() {
    cout << "This is derived1's vfunc().\n";
  }
};
   
class derived2 : public base {
public:
  void vfunc() {
    cout << "This is derived2's vfunc().\n";
  }
};
   
// Use a base class reference parameter.
void f(base &r) {
  r.vfunc();
}
   
int main()
{
  base b;
  derived1 d1;
  derived2 d2;
   
  f(b); // pass a base object to f()
  f(d1); // pass a derived1 object to f()
  f(d2); // pass a derived2 object to f()
   
  return 0;
}
  
    
    
  

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