Print Binary Tree (C++)

void SplayTree::printTree ()
{
    prettyPrintTree(root, "", true);
    cout << "------------------------\n";
}
void SplayTree::prettyPrintTree(Node* root, string prefix, bool isLeft) {
    if (root == nullptr) {
        cout << "Empty tree";
        return;
    }

    if(root->right) {
        prettyPrintTree(root->right, prefix + (isLeft ? "│   " : "    "), false);
    }

    cout << prefix + (isLeft ? "└── " : "┌── ") + root->user.name + "\n";

    if (root->left) {
        prettyPrintTree(root->left, prefix + (isLeft ? "    " : "│   "), true);
    }
}