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  1.     #include <type_traits>
  2.  
  3.     template<typename T>
  4.     struct identity { using type = T; };
  5.  
  6.     template<typename T>
  7.     using try_make_signed =
  8.         typename std::conditional<
  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<try_make_signed<unsigned int>::type, int>::value, "!");
  17.         static_assert(std::is_same<try_make_signed<double>::type, double>::value, "!");
  18.     }
  19.  
Success #stdin #stdout 0s 2892KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/pF1stw
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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