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reverse a linked list

template void linkedlist::reverselist()
{
    nodeptr ptr = headd;
    nodeptr nextptr = ptr->_next;
    while(nextptr)
    {
        nodeptr temp = nextptr->_next;
        nextptr->_next = ptr;
        ptr = nextptr;
        nextptr = temp;
    }
    head->_next = 0;
    head = ptr;
}
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