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contains

Language/Type: C++ binary trees pointers recursion

Write a function named contains that accepts a pointer to the root of a binary tree of integers. Your function also accepts an integer value as a parameter and returns true if that value is found somewhere in the tree. Note that the elements of the tree are not guaranteed to be in any particular order; if the value is in the tree, it could be anywhere. If the tree is empty (nullptr), return false.

Constraints: You must implement your function recursively and without using loops. Do not construct any new BinaryTreeNode objects in solving this problem (though you may create as many BinaryTreeNode* pointer variables as you like). Do not use any auxiliary data structures to solve this problem (no array, vector, stack, queue, string, etc). Your function should not modify the tree's state; the state of the tree should remain constant with respect to your function.

Assume that you are using the BinaryTreeNode structure as defined below: 

struct BinaryTreeNode {
    int data;
    BinaryTreeNode* left;
    BinaryTreeNode* right;
};
Function: Write a C++ function as described, not a complete program.

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