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Код: Выделить всё

#include <iostream>
class S {
 public:
   virtual int get() = 0;};
class A1 : public S {
 public:
   virtual int get() {
      return a1;
   }
 private:
   int a1;
};
class A2 : public A1 {
 public:
   virtual int get() {
      return a2;
   }
 private:
   int a2;
};
int main() {
   A1 *a1 = new A1();
   A1 *a2 = new A2();
   A2 *test = 0;
   test = dynamic_cast< A2 * >( a1 );
   if ( test != 0 )
      std::cout << "a1 is A2 object" << std::endl;
   else
      std::cout << "a1 is not A2 object" << std::endl;
   test = dynamic_cast< A2 * >( a2 );
   if ( test != 0 )
      std::cout << "a2 is A2 object" << std::endl;
   else
      std::cout << "a2 is not A2 object" << std::endl;
 system("pause");
   return 0;}