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  1. #include <type_traits>
  2.  
  3. template<typename T>
  4. using identity = std::common_type<T>;
  5.  
  6. template<typename T>
  7. using make_signed = typename std::conditional
  8. <
  9. 	std::is_integral<T>::value,
  10. 	std::make_signed<T>,
  11. 	identity<T>
  12. >::type;
  13.  
  14. int main()
  15. {
  16. 	static_assert(std::is_same<make_signed<unsigned int>::type, int>::value, "!");
  17. 	static_assert(std::is_same<make_signed<double>::type, double>::value, "!");
  18. }
  19.  
Success #stdin #stdout 0s 3336KB
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https://ideone.com/uNCPt5
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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