Dynamic cast : dynamic_cast « Pointer « C++ Tutorial

1. C++ Tutorial
2. Pointer
3. dynamic_cast

#include <iostream>
 using std::cout; // this file uses std::cout
 
 class Animal
 {
 public:
     Animal():itsAge(1) { 
        cout << "Animal constructor...\n"; 
     }
     virtual ~Animal() { 
        cout << "Animal destructor...\n"; 
     }
     virtual void Speak() const { 
        cout << "Animal speak!\n"; 
     }
 protected:
     int itsAge;
 };
 
 class Cat: public Animal
 {
 public:
     Cat() { 
        cout << "Cat constructor...\n"; 
     }
     ~Cat() { 
        cout << "Cat destructor...\n"; 
     }
     void Speak()const { 
        cout << "Meow\n"; 
     }
     void Miao() const { 
        cout << "Miao\n"; 
     }
 };
 
 class Dog: public Animal
 {
 public:
     Dog() { 
        cout << "Dog Constructor...\n"; 
     }
     ~Dog() { 
        cout << "Dog destructor...\n"; 
     }
     void Speak()const { 
        cout << "Woof!\n"; 
     }
 };
 
 
 int main()
 {
     const int NumberAnimals = 3;
     Animal* animalArray[NumberAnimals];
     
     int i;
     
     animalArray[0]  = new Dog;
     animalArray[1]  = new Cat;
     animalArray[2]  = new Cat;
 
     for (i=0; i<NumberAnimals; i++)
     {
         animalArray[i]->Speak();
 
         Cat *pRealCat =  dynamic_cast<Cat *> (animalArray[i]);
 
         if (pRealCat)
             pRealCat->Miao();
         else
             cout << "not a cat!\n";
 
         delete animalArray[i];
         cout << "\n";
     }
 
     return 0;
 }

Animal constructor...
Dog Constructor...
Animal constructor...
Cat constructor...
Animal constructor...
Cat constructor...
Woof!
not a cat!
Dog destructor...
Animal destructor...

Meow
Miao
Cat destructor...
Animal destructor...

Meow
Miao
Cat destructor...
Animal destructor...