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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. class Cat;
  6. class Dog;
  7. class Animal;
  8.  
  9. typedef std::vector<Cat*> CatCollection;
  10. typedef std::vector<Dog*> DogCollection;
  11. typedef std::vector<Animal*> AnimalCollection;
  12.  
  13. class Animal {
  14. public:
  15.     /* If the function is not virtual, then the child classes' functions
  16.       won't be called when calling from a variable of type Animal* */
  17. 	virtual void doStuff() {
  18. 		cout << "Animal stuff!" << endl;
  19. 	}
  20. };
  21.  
  22. class Cat : public Animal {
  23. 	void doStuff() override {
  24. 		cout << "Cat stuff!" << endl;
  25. 	}
  26. };
  27.  
  28. class Dog : public Animal {
  29. 	void doStuff() override {
  30. 		cout << "Dog stuff!" << endl;
  31. 	}
  32. };
  33.  
  34. int main() {
  35. 	AnimalCollection coll;
  36.  
  37. 	//add elements
  38. 	Cat *cat = new Cat();
  39. 	Dog *dog = new Dog();
  40. 	Animal *animal = new Animal();
  41.  
  42. 	coll.push_back(cat);
  43. 	coll.push_back(animal);
  44. 	coll.push_back(dog);
  45.  
  46. 	//do something with the first item of the collection
  47. 	cout << "Checking the first item" << endl;
  48. 	coll[0] -> doStuff();
  49.  
  50. 	cout << "Checking everything" << endl;
  51. 	//do something on all items
  52. 	for (Animal *c: coll) {
  53. 	    c -> doStuff();
  54. 	}
  55.  
  56. 	//deleting memory as it was allocated with new
  57. 	for (Animal *ptr: coll) {
  58. 		delete ptr;
  59. 	}
  60. 	coll.clear(); //remove any reference to dangling pointers
  61.  
  62.  
  63. 	return 0;
  64. }
Success #stdin #stdout 0s 3416KB
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stdin
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Standard input is empty
stdout
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Checking the first item
Cat stuff!
Checking everything
Cat stuff!
Animal stuff!
Dog stuff!
https://ideone.com/QpdR8a
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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