The Virtual Attribute Is Inherited : virtual function « Class « C++

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

The Virtual Attribute Is Inherited

   
#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";
  }
};
   
/* derived2 inherits virtual function vfunc()
   from derived1. */
class derived2 : public derived1 {
public:
  // vfunc() is still virtual
  void vfunc() {
    cout << "This is derived2's vfunc().\n";
  }
};
   
int main()
{
  base *p, b;
  derived1 d1;
  derived2 d2;
   
  // point to base
  p = &b;
  p->vfunc(); // access base's vfunc()
   
  // point to derived1
  p = &d1;
  p->vfunc(); // access derived1's vfunc()
   
  // point to derived2
  p = &d2;
  p->vfunc(); // access derived2's vfunc()
   
  return 0;
}
  
    
    
  

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