public function __construct(AbstractBinaryTree $root = NULL) { $this->queue = new \SplQueue(); parent::__construct($root); }
public function __construct(AbstractBinaryTree $root) { parent::__construct($root); }
public function __construct(AbstractBinaryTree $root = NULL) { $this->queue = new \SplQueue(); parent::__construct($root); }
public function __construct(AbstractBinaryTree $root) { parent::__construct($root); }