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  1. #include <iostream>
  2. #include <memory>
  3.  
  4. class Animals
  5. {
  6. public:
  7. 	virtual void Display() = 0;
  8. 	virtual ~Animals() = default;
  9. };
  10.  
  11. class Dog : public Animals
  12. {
  13. 	void Display() override
  14. 	{
  15. 		std::cout << "This is Dog!" << std::endl;
  16. 	}
  17. };
  18.  
  19. class Cat : public Animals
  20. {
  21. 	void Display() override
  22. 	{
  23. 		std::cout << "This is Cat!" << std::endl;
  24. 	}
  25. };
  26.  
  27. class Goat : public Animals
  28. {
  29. 	void Display() override
  30. 	{
  31. 		std::cout << "This is Goat!" << std::endl;
  32. 	}
  33. };
  34.  
  35. int main()
  36. {
  37. 	Animals* animal = new Dog;
  38. 	animal->Display();
  39. 	delete animal; // delete at some point to avoid memory leak as Dog is allocated on the heap
  40.  
  41. 	Cat cat;
  42. 	animal = &cat;
  43. 	animal->Display(); // no delete needed, as Cat is allocated on the stack and will cleared when goes out of scope
  44.  
  45. 	std::unique_ptr<Animals> animal2 = std::make_unique<Goat>();
  46. 	animal2->Display(); // no delete needed, Goat is allocated on the heap but will be cleared when goes out of scope
  47.  
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 4452KB
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Standard input is empty
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This is Dog!
This is Cat!
This is Goat!
https://ideone.com/yoVt4G
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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