Virtual function: respond to random events

#include <iostream>
#include <cstdlib>
using namespace std;

class BaseClass {
public:
  int i;
  BaseClass(int x) { 
     i = x; 
  }
  virtual void myFunction()
  {
    cout << "Using BaseClass version of myFunction(): ";
    cout << i << '\n';
  }
};

class DerivedClass1 : public BaseClass {
public:
  DerivedClass1(int x) : BaseClass(x) {}
  void myFunction() 
  {
    cout << "Using DerivedClass1's version of myFunction(): ";
    cout << i*i << '\n';
  }
};

class DerivedClass2 : public BaseClass {
public:
  DerivedClass2(int x) : BaseClass(x) {}
  void myFunction() 
  {
    cout << "Using DerivedClass2's version of myFunction(): ";
    cout << i+i << '\n';
  }
};

int main()
{
  BaseClass *p;
  DerivedClass1 derivedObject1(10);   
  DerivedClass2 derivedObject2(10); 
  int i, j;

  for(i = 0; i <10; i++) {
    j = rand();
    if( ( j % 2 ) ) 
       p = &derivedObject1; 
    else 
       p = &derivedObject2; 
    p->myFunction();                      // call appropriate function
  }

  return 0;
}

Related examples in the same category

1.	A simple example using a virtual function.
2.	Virtual functions are hierarchical.
3.	Use virtual function to define interface.
4.	Virtual functions retain virtual nature when inherited.
5.	Virtual function and public inheritance
6.	Virtual function and three level inheritance
7.	Virtual function for two derived classes
8.	Class pointer and virtual function

Virtual function: respond to random events : Virtual « Function « C++

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