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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct foo {};
  5. struct xyz {};
  6.  
  7. struct base {
  8. 	base(foo) { cout << "base(foo)\n"; }
  9. 	base(xyz) { cout << "base(xyz)\n"; }
  10. 	base(const base&) { cout << "base(base) - cctor\n"; }
  11. };
  12.  
  13. struct derived : base {
  14. 	template<class... Args>
  15. 	derived(Args&&... args) : base(forward<Args>(args)...) {
  16. 		cout << __PRETTY_FUNCTION__ << endl;
  17. 	}
  18.  
  19. 	template<class Arg>
  20. 	derived(Arg&& arg) : base(arg) {
  21. 		cout << __PRETTY_FUNCTION__ << endl;
  22. 	}
  23.  
  24. 	template<class Arg>
  25. 	derived(const Arg& arg) : base(arg) {
  26. 		cout << __PRETTY_FUNCTION__ << endl;
  27. 	}
  28.  
  29. 	derived(const derived& d) : base(d) { cout << "derived cctor\n"; }
  30.  
  31. 	derived(derived&& d) : base(d) { cout << "derived mctor\n"; }
  32.  
  33. 	derived(xyz x) : base(x) { cout << "derived(xyz)\n"; }
  34. };
  35.  
  36. int main() {
  37. 	derived d1((foo()));
  38. 	cout << "-----" << endl;
  39. 	derived d2((xyz()));
  40. 	cout << "-----" << endl;
  41. 	derived d3(d1);
  42. 	cout << "-----" << endl;
  43. 	return 0;
  44. }
Success #stdin #stdout 0s 3412KB
comments (?)
stdin 
Standard input is empty
stdout 
base(foo)
derived::derived(Arg&&) [with Arg = foo]
-----
base(xyz)
derived(xyz)
-----
base(base) - cctor
derived::derived(Arg&&) [with Arg = derived&]
-----
https://ideone.com/HCKwKm
template constructor of derived class wtf.
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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