Zadanie Dejwu, C++ (clang)

Zadanie Dejwu

#include <iostream>

class Node {
  public:
    Node() = delete;
    Node(int d) : data{d} { next = nullptr; }
    Node(int d, Node* ptr) : data{d}, next{ptr} {}

static void deleteNode(Node * ptr) {
        
        if(ptr == nullptr) return;
        
        //tail
        else if(ptr->next == nullptr) {
            //previous->next wskazuje na usuniety Node -> UB
            delete ptr;
        }
        
        //rest
        else {
            Node * tmp = ptr->next;
            ptr->data = tmp->data;
            ptr->next = tmp->next;
            delete tmp;
        }
    }
    
    static void printList(Node * ptr) {
        while(ptr != nullptr) {
        std::cout << ptr->data << '\n';
        ptr = ptr->next;
        }
    }

int data;
    Node *next;
};

auto main() ->int
{
    Node* third = new Node(3);
    Node* second = new Node(2, third);
    Node* head = new Node(1, second);
    
    Node::printList(head);
    
    Node::deleteNode(third);
    std::cout << '\n';
    Node::printList(head);
}


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