Delete Node in a Linked List

https://leetcode.com/problems/delete-node-in-a-linked-list/

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    void deleteNode(ListNode* node) {
        if(node==NULL||node->next==NULL)
            return;
        ListNode * temp;
        ListNode * tail;
        temp=node;
        tail=node->next;
        while(true)
        {
            temp->val=tail->val;
            if(tail->next==NULL)
                break;
            else
            {
                temp=tail;
                tail=tail->next;
            }
        }
        temp->next=NULL;
    }
};