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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. struct Logger
  6. {
  7.     template<typename Type>
  8.     using IsRawString =
  9.         std::integral_constant<bool, std::is_same<const char*, Type>::value || std::is_same<char*, Type>::value>;
  10.  
  11.     template<typename Type, typename Enable = void>
  12.     struct Traits
  13.     {
  14.         static const int Index = 1;
  15.     };
  16.  
  17.     template<typename Type>
  18.     struct Traits<Type, std::enable_if_t<IsRawString<Type>::value>>
  19.     {
  20.         static const int Index = 2;
  21.     };
  22.  
  23.     template<typename Type>
  24.     struct Traits<Type, std::enable_if_t<std::is_pointer<Type>::value && !IsRawString<Type>::value>>
  25.     {
  26.         static const int Index = 3;
  27.     };
  28.  
  29. };
  30.  
  31. int main()
  32. {
  33.     cout << Logger::Traits<int>::Index << endl
  34.          << Logger::Traits<char*>::Index << endl
  35.          << Logger::Traits<const char*>::Index << endl
  36.          << Logger::Traits<void*>::Index << endl;
  37.  
  38.  
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 16048KB
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https://ideone.com/WQy71r
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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