C++ *&符号连用

void createTree(Node *&head)
{
    TypeElement data;
    cin >> data;
    if (data == ‘#‘)
    {
        head = NULL;
        return;
    }

    head = new Node(data);
    createTree(head->lChild);
    createTree(head->rChild);
}

int main()
{
    //cin >> nodeNum;
    Node *treeHead;
    createTree(treeHead);
    treeTraverse(treeHead, 0);
    cin >> nodeNum;
    return 0;
}