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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class List
  5. {
  6.     struct Node
  7.     {
  8.         int data;
  9.         Node *next = nullptr;
  10.  
  11.         Node(int data1) : data(data1) { }
  12.     };
  13.  
  14.     Node *head, *tail;
  15.  
  16. public:
  17.     List() : head(nullptr), tail(nullptr) { }
  18.     List(const List&) = delete;
  19.     List& operator=(const List&) = delete;
  20.  
  21.     ~List()
  22.     {
  23.         Node *n = head;
  24.         while (n)
  25.         {
  26.             Node *next = n->next;
  27.             delete n;
  28.             n = next; 
  29.         }
  30.     }
  31.  
  32.     void push_back(int data)
  33.     {
  34.         Node **n = (tail) ? &(tail->next) : &head;
  35.         *n = new Node(data);
  36.         tail = *n;
  37.     }
  38.  
  39.     friend ostream& operator<<(ostream &os, const List &list)
  40.     {
  41.         Node *n = list.head;
  42.         if (n)
  43.         {
  44.             os << n->data;
  45.             while (n = n->next)
  46.             {
  47.                 os << ',' << n->data;
  48.             }
  49.         }
  50.         return os;
  51.     }
  52. };
  53.  
  54. int main()
  55. {
  56.     int arr[] = {1, 2, 3, 4, 5, 6};
  57.     List list;
  58.     for(int elem : arr)
  59.         list.push_back(elem);
  60.     cout << list;
  61.     return 0;
  62. }
Success #stdin #stdout 0s 5300KB
comments (?)
stdin 
Standard input is empty
stdout 
1,2,3,4,5,6
https://ideone.com/6g1JQZ
language:
C++ (gcc 8.3)
created:
92 days ago
visibility:
secret

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