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  1.     #include <utility>
  2.  
  3.     // empty declaration with variable number of arguments
  4.     template<typename...>
  5.     struct hnode;
  6.  
  7.     // specialization for 1 template argument
  8.     template<typename T>
  9.     struct hnode<T> {
  10.         T data;
  11.         std::nullptr_t next;
  12.     };
  13.  
  14.     // specialization for multiple template arguments
  15.     template<typename T, typename... Rest>
  16.     struct hnode<T, Rest...> {
  17.         T data;
  18.         hnode<Rest...>* next;
  19.     };
  20.  
  21.     template<typename T>
  22.     hnode<T> hcons(T&& val, std::nullptr_t) {
  23.         return { std::forward<T>(val), nullptr };
  24.     }
  25.  
  26.     template<typename T, typename... Rest>
  27.     hnode<T, Rest...> hcons(T&& val, hnode<Rest...>& next) {
  28.         return { std::forward<T>(val), &next };
  29.     }
  30.  
  31.     int main() {
  32.         hnode<int> three = hcons(1, nullptr);
  33.         auto two = hcons("hi", three);
  34.     }
Success #stdin #stdout 0s 3336KB
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https://ideone.com/ZC2Pow
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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