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  1. #include <iostream>
  2.  
  3. struct Base
  4. {
  5. 	virtual void mem_f() = 0;
  6. 	virtual ~Base() {};
  7. };
  8.  
  9. template <class T>
  10. struct Derived;
  11.  
  12. template <>
  13. struct Derived<std::string> : public Base
  14. {
  15. 	virtual void mem_f() { std::cout << "Derived<std::string>::mem_f()\n"; };
  16. };
  17.  
  18. template <>
  19. struct Derived<int> : public Base
  20. {
  21. 	virtual void mem_f() { std::cout << "Derived<int>::mem_f()\n"; };
  22. };
  23.  
  24. Base* menu()
  25. {
  26. 	int x; std::cin >> x;
  27. 	if (x == 42) {
  28. 		return new Derived<std::string>;
  29. 	}
  30. 	return new Derived<int>;
  31. }
  32. int main()
  33. {
  34. 	Base *base1 = menu();
  35. 	base1->mem_f();
  36.  
  37. 	Base *base2 = menu();
  38. 	base2->mem_f();
  39.  
  40. 	delete base1;
  41. 	delete base2;
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0s 3432KB
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stdin
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42
5
stdout
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Derived<std::string>::mem_f()
Derived<int>::mem_f()
https://ideone.com/qPS3SR
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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