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  1. #include <iostream>
  2. #include <list>
  3. #include <string>
  4. using namespace std;
  5.  
  6. class Animal {
  7. public:
  8.     virtual void speak() = 0;
  9.     virtual ~Animal() {}; // Always a good thing if the class has virtual members
  10.     string name;
  11. };
  12.  
  13. class Dog : public Animal {
  14. public:
  15.     Dog(string n) { this->name = n; }
  16.     void speak() { cout << this->name << " says WOOF!" << endl; }    
  17. };
  18.  
  19. class AnimalQueue {
  20.     list<Dog> dogs;
  21. public:
  22.     void enqueue(Animal* a) {
  23.         Dog * d = dynamic_cast<Dog*>(a);
  24.         dogs.push_back(*d); // This creates a copy of d and stores it
  25.     }
  26.     Dog dequeueDog() {
  27.         Dog  d = dogs.front(); // This creates a copy of the front element
  28.         dogs.pop_front();
  29.         return d;
  30.     }
  31. };
  32.  
  33. int main() {
  34.     // Set up
  35.     AnimalQueue q;
  36.     Dog * d;
  37.     d = new Dog("Rex");
  38.     q.enqueue(d);
  39.  
  40.     // Try with dog-specific command
  41.     *d = q.dequeueDog();
  42.     cout << d->name << endl;// Prints "Rex"
  43.     d->speak();
  44.  
  45.     delete d; // Free your memory
  46.  
  47.     return 0;
  48. }
Success #stdin #stdout 0s 3276KB
comments ()
stdin 
Standard input is empty
stdout 
Rex
Rex says WOOF!
https://ideone.com/mWRuEV
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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