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  1. #include <vector>
  2.  
  3. template<typename T>
  4. class Listoid;
  5. template<typename T>
  6. Listoid<T> cons(T new_elem, Listoid<T> list);
  7.  
  8. template<typename T>
  9. class Listoid{
  10.  
  11.   private:
  12.     std::vector<T> list;
  13.  
  14.   public:
  15.     typedef typename std::vector<T>::iterator iterator;
  16.  
  17.     iterator begin() {return list.begin();}
  18.     iterator end() {return list.end();}
  19.  
  20.   public:
  21.     Listoid(T t) {
  22.       list.push_back(t);
  23.     }
  24.  
  25.   const T operator [](int i){
  26.     return list[i];
  27.   }
  28.  
  29.   void addElem(T ne){
  30.     list.push_back(ne);
  31.   }
  32.  
  33.   friend Listoid<T> cons <>(T new_elem, Listoid<T> list);
  34.  
  35. };
  36.  
  37. template<typename T>
  38. Listoid<T> cons(T new_elem, Listoid<T> list){
  39.  
  40.   Listoid<T> new_list(new_elem);
  41.   for(typename Listoid<T>::iterator it = list.begin(), e = list.end();
  42.         it != e; ++it){
  43.           new_list.addElem(*it);
  44.         }
  45.   return new_list;
  46. }
  47.  
  48.  
  49. int main(){
  50.  
  51.   Listoid<int> lista(312);
  52.   lista.addElem(22);
  53.  
  54.   Listoid<int> lista2 = cons(21, lista);
  55.  
  56.   return 0;
  57. }
Success #stdin #stdout 0s 3012KB
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https://ideone.com/sTpPX
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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