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  1. #include <iostream>
  2. #include <type_traits>
  3. using namespace std;
  4.  
  5. namespace detail
  6. {
  7. 	template <typename T>
  8. 	auto has_to_string_helper (...) -> false_type;
  9.  
  10. 	template <typename T>
  11. 	auto has_to_string_helper (int) -> decltype(std::to_string(std::declval<T>()), true_type{});
  12. }
  13.  
  14. template <typename T>
  15. using has_to_string = decltype(detail::has_to_string_helper<T>(0));
  16.  
  17. template<typename T> 
  18. enable_if_t<has_to_string<T>::value, void> stringify(T t){
  19.     cout << "has\n";
  20. }
  21. template<typename T> 
  22. enable_if_t<!has_to_string<T>::value, void> stringify(T t){
  23.     cout << "has not\n";
  24. }
  25.  
  26. int main() {
  27. 	stringify(0);
  28. 	stringify("");
  29. 	return 0;
  30. }
Success #stdin #stdout 0s 3140KB
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Standard input is empty
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has
has not
https://ideone.com/rs0p8L
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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