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  1. #include <iostream>
  2. using namespace std;
  3. class Base {
  4. 	public:
  5. 	virtual void tell()	{
  6. 		cout<<"Base"<<endl;
  7. 	}
  8. 	void tell_usual() {
  9. 		cout<<"Base"<<endl;
  10. 	}
  11. };
  12.  
  13. class Derived : public Base {
  14. 	public:
  15. 	void tell() override {
  16. 		cout<<"Derived"<<endl;
  17. 	}
  18. 	void tell_usual() {
  19. 		cout<<"Derived"<<endl;
  20. 	}
  21. };
  22.  
  23.  
  24. int main() {
  25. 	Base * base = new Base();
  26. 	Derived * derived = new Derived();
  27. 	Base *derived_as_base = derived; //pay attention! ptr to Base!
  28. 	cout<<"Base::tell ";
  29. 	base->tell();
  30. 	cout<<"Base::tell_usual ";
  31. 	base->tell_usual();
  32. 	cout<<"Derived::tell ";
  33. 	derived->tell();
  34. 	cout<<"Derived::tell_usual ";
  35. 	derived->tell_usual();
  36. 	cout<<"(Base*)Derived::tell (POLYMORPH!) ";
  37. 	derived_as_base->tell();
  38. 	cout<<"(Base*)Derived::tell_usual ";
  39. 	derived_as_base->tell_usual();
  40.  
  41. 	delete base;
  42. 	delete derived;
  43. 	return 0;
  44. }
Success #stdin #stdout 0s 4524KB
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stdout
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Base::tell Base
Base::tell_usual Base
Derived::tell Derived
Derived::tell_usual Derived
(Base*)Derived::tell (POLYMORPH!) Derived
(Base*)Derived::tell_usual Base
https://ideone.com/tyEFIs
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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