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  1. #include <iostream>
  2. #include <memory>
  3.  
  4. class parent {
  5. 	public:
  6. 		virtual std::string who() { return "parent"; }
  7. 		virtual ~parent(){}
  8. };
  9.  
  10. class child1 : public parent {
  11. 	public:
  12. 		std::string who() override { return "child1"; }
  13. };
  14.  
  15. class child2 : public parent {
  16. 	public:
  17. 		std::string who() override { return "child2"; }
  18. };
  19.  
  20. using fn_ptr = std::string (parent::*)();
  21. using parent_ptr = std::shared_ptr<parent>;
  22.  
  23. std::string run(parent_ptr x, fn_ptr fnc)
  24. {
  25. 	return (x.get()->*fnc)();
  26. }
  27.  
  28. int main()
  29. {
  30. 	parent_ptr c1 = std::make_shared<child1>();
  31. 	parent_ptr c2 = std::make_shared<child2>();
  32. 	fn_ptr who = &parent::who;
  33.  
  34. 	std::cout << run(c1, who) << '\n';
  35. 	std::cout << run(c2, who) << '\n';
  36. }
  37.  
Success #stdin #stdout 0s 4932KB
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https://ideone.com/VUS9Hv
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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