c++ new관련 질문

#include <iostream>
 
class turn
{
private:
    int x, y;
public:
    turn(int x, int y)
        :x{ x }, y{ y }
    {
    }
    int k()
    {
        return x + y;
    }
};
 
class game
{
private:
    turn* p;
public:
    void Add(turn *turn_p)
    {
        p = turn_p;
    }
 
    friend int main(); // A friend declaration
};
 
int main()
{
    game game;
    game.Add(new turn(2, 2));
 
    game.p->k(); // main에서 p에 k 호출하기
}