// rtti2.cpp -- using dynamic_cast, typeid, and type_info #include #include #include #include using namespace std; class Grand { private: int hold; public: Grand(int h = 0) : hold(h) {} virtual void Speak() const { cout << "I am a grand class!\n";} virtual int Value() const { return hold; } }; class Superb : public Grand { public: Superb(int h = 0) : Grand(h) {} void Speak() const {cout << "I am a superb class!!\n"; } virtual void Say() const { cout << "I hold the superb value of " << Value() << "!\n";} }; class Magnificent : public Superb { private: char ch; public: Magnificent(int h = 0, char cv = 'A') : Superb(h), ch(cv) {} void Speak() const {cout << "I am a magnificent class!!!\n";} void Say() const {cout << "I hold the character " << ch << " and the integer " << Value() << "!\n"; } }; Grand * GetOne(); int main() { srand(time(0)); Grand * pg; Superb * ps; for (int i = 0; i < 5; i++) { pg = GetOne(); cout << "Now processing type " << typeid(*pg).name() << ".\n"; pg->Speak(); if( ps = dynamic_cast(pg)) ps->Say(); if (typeid(Magnificent) == typeid(*pg)) cout << "Yes, you're really magnificent.\n"; } // std::cin.get(); return 0; } Grand * GetOne() { Grand * p; switch( rand() % 3) { case 0: p = new Grand(rand() % 100); break; case 1: p = new Superb(rand() % 100); break; case 2: p = new Magnificent(rand() % 100, 'A' + rand() % 26); break; } return p; }