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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. using namespace std;
  5.  
  6. struct Logger
  7. {
  8. //    template<typename Type>
  9. //    using IsRawString =
  10. //        std::integral_constant<bool, std::is_same<const char*, Type>::value || std::is_same<char*, Type>::value>;
  11.  
  12.     template<typename Type>
  13.     static constexpr bool IsRawString()
  14.     {
  15.         return std::is_same<const char*, Type>::value || std::is_same<char*, Type>::value;
  16.     }
  17.  
  18.     template<typename Type, typename Enable = void> struct Traits;
  19.  
  20.     template<typename Type>
  21.     struct Traits<Type, std::enable_if_t<!IsRawString<Type>() && !std::is_pointer<Type>::value>>
  22.     {
  23.         static const int Index = 1;
  24.     };
  25.  
  26.     template<typename Type>
  27.     struct Traits<Type, std::enable_if_t<IsRawString<Type>()>>
  28.     {
  29.         static const int Index = 2;
  30.     };
  31.  
  32.     template<typename Type>
  33.     struct Traits<Type, std::enable_if_t<std::is_pointer<Type>::value && !IsRawString<Type>()>>
  34.     {
  35.         static const int Index = 3;
  36.     };
  37.  
  38. };
  39.  
  40. int main()
  41. {
  42.     cout << Logger::Traits<int>::Index << endl
  43.          << Logger::Traits<char*>::Index << endl
  44.          << Logger::Traits<const char*>::Index << endl
  45.          << Logger::Traits<void*>::Index << endl;
  46.  
  47.  
  48.     return 0;
  49. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
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https://ideone.com/19V8wv
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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