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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template <typename T, typename U>
  5. struct S
  6. {
  7. 	unsigned int operator()(T t, U u) const
  8. 	{
  9. 		return 1;
  10. 	}
  11. };
  12.  
  13. template <typename T>
  14. struct S<T,nullptr_t>
  15. {
  16. 	bool operator()(T t, nullptr_t u) const
  17. 	{
  18. 		return 2;
  19. 	}
  20. };
  21.  
  22. class A{};
  23. class B{};
  24.  
  25. int main() {
  26. 	A a;
  27. 	B b;
  28.  
  29. 	cout << S<A*,B*>()(&a,&b) << endl;
  30. 	cout << S<A*,nullptr_t>()(&a,nullptr) << endl;
  31.  
  32. 	return 0;
  33. }
  34.  
Success #stdin #stdout 0s 4536KB
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https://ideone.com/KaiaZN
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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