Virtual Functions and Polymorphism

   
#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";
  }
};
   
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;
}

1.	virtual function from base and derived classes
2.	Virtual function and two subclasses
3.	Abstract classes by virtual function with no body
4.	Override non-virtual function
5.	Implementing Pure Virtual Functions
6.	Illustration of the Use of Virtual Inheritance
7.	Using Virtual Methods
8.	Multiple Virtual Functions Called in Turn
9.	Virtual Copy Constructor
10.	virtual functions accessed from pointer
11.	virtual functions with person class
12.	Call parent virtual function
13.	Using Virtual Functions to control the behaviour
14.	Pure Virtual Functions as a prototype
15.	Virtual Functions Are Hierarchical
16.	Virtual function in three level inheritance
17.	The Virtual Attribute Is Inherited
18.	A base class reference is used to access a virtual function
19.	Virtual base classes.
20.	virtual members

Virtual Functions and Polymorphism : virtual function « Class « C++

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