emp.cpp

#include <iostream>
using namespace std;

class Employee {
public:
  virtual void raiseSalary() { cout << 0 << endl; }

  virtual void promote() { /* common promote code */
  }
};

class Manager : public Employee {
  virtual void raiseSalary() { cout << 100 << endl; }

  virtual void promote() { /* Manager specific promote */
  }
};
class Engineer : public Employee {
  virtual void raiseSalary() { cout << 200 << endl; }

  virtual void promote() { /* Manager specific promote */
  }
};

// Similarly, there may be other types of employees
// We need a very simple function to increment salary of all employees
// Note that emp[] is an array of pointers and actual pointed objects can
// be any type of employees. This function should ideally be in a class
// like Organization, we have made it global to keep things simple
void globalRaiseSalary(Employee *emp[], int n) {
  for (int i = 0; i < n; i++)
    emp[i]->raiseSalary(); // Polymorphic Call: Calls raiseSalary()
                           // according to the actual object, not
                           // according to the type of pointer
}
int main() {
  Employee *emp[] = {new Manager(), new Engineer};
  globalRaiseSalary(emp, 2);
  return 0;
}