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  1. #include <cstdlib>
  2. #include <typeinfo>
  3. #include <ctime>
  4. #include <iostream>
  5. #include <list>
  6.  
  7. class Animal
  8. {
  9. public:
  10.     virtual ~Animal() = 0 ;
  11. };
  12.  
  13. Animal::~Animal() {}
  14.  
  15. class Cat : public Animal
  16. {
  17. };
  18.  
  19. class Dog : public Animal
  20. {
  21. };
  22.  
  23. typedef std::list<Animal*> list_type;
  24.  
  25. void displayTypes(list_type::iterator beg, list_type::iterator end)
  26. {
  27.     while (beg != end)
  28.     {
  29.         Animal* value = *beg++;
  30.  
  31.         if (typeid(*value) == typeid(Cat))
  32.             std::cout << "Cat";
  33.         else if (typeid(*value) == typeid(Dog))
  34.             std::cout << "Dog";
  35.         else if (typeid(*value) == typeid(Animal))
  36.             std::cout << "Animal";          // This should never happen!
  37.         else
  38.             std::cout << "Unknown";
  39.  
  40.         std::cout << '\n';
  41.     }
  42. }
  43.  
  44. int main()
  45. {
  46.     std::srand(std::time(0));
  47.  
  48.     list_type list;
  49.  
  50.     for (unsigned i = 0; i < 10; ++i)
  51.         list.push_back((rand() % 2 ? (Animal*)new Cat : (Animal*)new Dog));
  52.  
  53.     displayTypes(std::begin(list), std::end(list));
  54.  
  55.     while (!list.empty())
  56.     {
  57.         delete list.back();
  58.         list.pop_back();
  59.     }
  60. }
Success #stdin #stdout 0s 3476KB
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Cat
Dog
Dog
Cat
Dog
Cat
Dog
Cat
Dog
Cat
https://ideone.com/ktgLoX
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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