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  1. #include <iostream>
  2. #include <tuple>
  3. #include <cstddef>
  4. using namespace std;
  5.  
  6.  
  7.   template <class T, class Tuple>
  8.   struct Index;
  9.  
  10.   template <class T, class... Types>
  11.   struct Index<T, std::tuple<T, Types...>> {
  12.       static const std::size_t value = 0;
  13.   };
  14.  
  15.   template <class T, class U, class... Types>
  16.   struct Index<T, std::tuple<U, Types...>> {
  17.       static const std::size_t value = 1 + Index<T, std::tuple<Types...>>::value;
  18.   };
  19.  
  20. template<class EnumType, template<class T, T> class Element, EnumType... enumValues>
  21. class Map
  22.   {
  23.   public:
  24.     using Type = std::tuple<Element<EnumType, enumValues>...>;
  25.  
  26.     template<EnumType enumValue>
  27.       using index = Index<Element<EnumType, enumValue>, Type>;
  28.  
  29.     template<EnumType enumValue>
  30.     Element<EnumType, enumValue>& get();
  31.  
  32.     Type storage_;
  33.   };
  34.  
  35. template<class EnumType, template<class T, T> class StorageElement, EnumType... enumValues>
  36. template<EnumType enumValue>
  37. StorageElement<EnumType, enumValue>& Map<EnumType, StorageElement, enumValues...>::get()
  38.   {
  39.   return std::get<index<enumValue>::value>(storage_);
  40.   }
  41. int main() {
  42. 	// your code goes here
  43. 	return 0;
  44. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/J98htf
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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