"Two star programming" with no star

203.cc

#include <functional>
 
class Solution {
public:
    ListNode* removeElements(ListNode* head, int val) {
        auto ls = std::ref(head);
        
        while (ls != nullptr) {
            if (ls.get()->val == val) {
                auto p = ls.get();
                ls.get() = p->next;
                delete p;
            }
            else
                ls = ls.get()->next;
        }
        
        return head;
    }
};