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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. struct Logger
  6. {
  7.     template<typename Type>
  8.     constexpr bool IsRawString()
  9.     {
  10.         return std::is_same<const char*, Type>::value || std::is_same<char*, Type>::value;
  11.     }
  12.  
  13.     template<typename Type, typename Enable = void>
  14.     struct Traits
  15.     {
  16.         static const int Index = 1;
  17.     };
  18.  
  19.     template<typename Type>
  20.     struct Traits<Type, std::enable_if_t<IsRawString<Type>()>>
  21.     {
  22.         static const int Index = 2;
  23.     };
  24.  
  25.     template<typename Type>
  26.     struct Traits<Type, std::enable_if_t<std::is_pointer<Type>::value && !IsRawString<Type>()>>
  27.     {
  28.         static const int Index = 3;
  29.     };
  30.  
  31. };
  32.  
  33. int main()
  34. {
  35.     cout << Logger::Traits<int>::Index << endl
  36.          << Logger::Traits<char*>::Index << endl
  37.          << Logger::Traits<const char*>::Index << endl
  38.          << Logger::Traits<void*>::Index << endl;
  39.  
  40.  
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0s 15224KB
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https://ideone.com/wPiM1m
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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