c++ - Linkedlist - Templates - Pointer -

what wrong code? i'm getting error @ runner = runner->next;, after debugging, don't see what's wrong it.

void linkedlist<t>::add(t item) {     if (root == 0)     {         root = new node<t>(item);         cout << "add, root empty \n";     }     else     {         cout << "add, root  not empty \n";         node<t> * runner = root;         while (runner != 0)         {             runner = runner->next;         }         runner = new node<t>(item);     } } 

it should this:

node<t> * runner = root; while (runner->next != null) {     runner = runner->next; } runner->next = new node<t>(item); 

your code changes local variable, , not actual node. (note runner->next object in actual list, while runner local variable.)