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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5.  
  6. template<typename Type>
  7. using IsRawString =
  8.     std::integral_constant<bool, std::is_same<const char*, Type>::value || std::is_same<char*, Type>::value>;
  9.  
  10. template<typename Type, typename Enable = void>
  11. struct Traits
  12. {
  13.     static const int Index = 1;
  14. };
  15.  
  16. template<typename Type>
  17. struct Traits<Type, std::enable_if_t<IsRawString<Type>::value>>
  18. {
  19.     static const int Index = 2;
  20. };
  21.  
  22. template<typename Type>
  23. struct Traits<Type, std::enable_if_t<std::is_pointer<Type>::value && !IsRawString<Type>::value>>
  24. {
  25.     static const int Index = 3;
  26. };
  27.  
  28. int main()
  29. {
  30.     cout << Traits<int>::Index << endl
  31.          << Traits<char*>::Index << endl
  32.          << Traits<const char*>::Index << endl
  33.          << Traits<void*>::Index << endl;
  34.  
  35.     return 0;
  36. }
  37.  
Success #stdin #stdout 0s 16048KB
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https://ideone.com/WGVuXE
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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