برنامج عن ال binary tree في c++

ايش كود trarers في برنامج ال binary tree

:(

وده كود ال insert ما اعرف اذا عندي في خطأ ولا؟

void insert(TreeNode * & nodePtr, int item)
{
   TreeNode* newnode = makeTreeNode(item);


   if (nodePtr == NULL)
   	{
		nodePtr = newnode;
		//return;
	   }
TreeNode * current;
TreeNode * before;
current = nodePtr;
 while (current != NULL)
	{
		   	before = current;
		 	if (newnode->key > current->key)
				current = current->right;
			else
			current = current->left;
	}//while
 if (newnode->key < before->key)
		before->left  =newnode
 else
		befor->right = newnode;
}//insert