call of duty

#include <iostream>
using namespace std;

template<typename T>
class BinaryTree
{
private:
    template<typename T>
    class Node
    {
    public:
        Node* pRight;
        Node* pLeft;
        T data;
        Node(T data = T(), Node* pRight = nullptr, Node* pLeft = nullptr)
        {
            this->data = data;
            this->pRight = pRight;
            this->pLeft = pLeft;
        }
    };
    Node<T>* root;
    size_t size;
public:
    BinaryTree();
    ~BinaryTree();
    void push(T data, Node*& node);
    void clear();
    int getSize() { return size; }
    T operator[] (const int index);
};

template<typename T>
BinaryTree<T>::BinaryTree()
{
    size = 0;
    root = nullptr;
}

template<typename T>
BinaryTree<T>::~BinaryTree()
{
    clear();
}

template<typename T>
void BinaryTree<T>::push(T data, Node*& node)
{
    if (root == nullptr)
    {
        root = new Node<T>(data);
    }
    else
    {
        Node<T>* current = this->root;
        if (current->data < data)
            push(data, current->pLeft);
        else
            push(data, current->pRight);
    }
    size++;
}

template<typename T>
void BinaryTree<T>::clear()
{
    while (size)
    {
        //pop_front();
    }
}

int main()
{
    cout << "Hello World!\n";
}