list1402.cpp

teach yourself C++ in 21 days 第五版

// Listing 14.2 Using dynamic_cast.
// Using rtti

#include <iostream>
using namespace std;

enum TYPE { HORSE, PEGASUS };

class Horse
{
  public:
    virtual void Gallop(){ cout << "Galloping...\n"; }

  private:
    int itsAge;
};

class Pegasus : public Horse
{
  public:
    virtual void Fly()
        {cout<<"I can fly! I can fly! I can fly!\n";}
};

const int NumberHorses = 5;
int main()
{
   Horse* Ranch[NumberHorses];
   Horse* pHorse;
   int choice,i;
   for (i=0; i<NumberHorses; i++)
   {
      cout << "(1)Horse (2)Pegasus: ";
      cin >> choice;
      if (choice == 2)
         pHorse = new Pegasus;
      else
         pHorse = new Horse;
      Ranch[i] = pHorse;
   }
   cout << endl;
   for (i=0; i<NumberHorses; i++)
   {
      Pegasus *pPeg = dynamic_cast< Pegasus *> (Ranch[i]);
      if (pPeg != NULL)
         pPeg->Fly();
      else
         cout << "Just a horse\n";

      delete Ranch[i];
   }
   return 0;
}