c++ algorithm : Write AVL Tree left rotation function: Left rotate a node which has shared pointer of parent and shared pointers of left and right children.

the AVL node has

private:

int key;

int height;

int balance_factor;

std::weak_ptr parent;

std::shared_ptr left;

std::shared_ptr right;

Write the function of rotate:

void AVLTree::RotateLeft(std::shared_ptr ¤tNode) {