Please code in C++

(4) Based on Problem P13.10 Write a program that reads a list of strings (a string per line) from the file data4.txt and inserts them into a binary search tree. You can use the implementation of the class BinarySearchTree introduced in the textbook. Implement a traversal function void inorder (Action&a) for inorder traversal of a binary search tree that carries out an action other than just printing the node data. The action should be supplied as a derived class of the class class Action ( public: void act (string str) ) . Use the inorder function, and a suitable class derived from Action, to compute the sum of all lengths of the strings stored in a tree and then display it * Similarly, implement traversal functions preorder (Action & a) and postorder (Action &a)