c++ question thingy

BST.cpp

BST& BST::operator=(BST&& otherBST) {
    if (this != &otherBST) {
        if (root) {
            stack <Node**> nodeStack;
            nodeStack.push(&root);

            Node **currentNode = nullptr;
            while (!nodeStack.empty()) {
                currentNode = nodeStack.top();
                nodeStack.pop();

                if ((*currentNode)->rlink) {
                    nodeStack.push(&(*currentNode)->rlink);
                }
                if ((*currentNode)->llink) {
                    nodeStack.push(&(*currentNode)->llink);
                }

                delete *currentNode;
                *currentNode = nullptr;
            }
            cout << root << endl; // This is where it seems like root is not being deleted correctly/nullptr'd.
        }

        root = move(otherBST.root);
        otherBST.root = nullptr;
    }
    else {
        cerr << "ERROR: Cannot assign to self." << endl;
    }

    return *this;
}