#include <iostream>
#include <vector>

using namespace std;

class Behaviour;

class Object
{
public:
    Object();
    void add_behaviour(Behaviour* behaviour);
    void simulate();
    void set_x(int i);
    void set_y(int i);
    int get_x() const;
    int get_y() const; 

    
private:
    int x;
    int y;
    vector<Behaviour*> behaviours;
};


class Behaviour
{
public:
    Behaviour() = default;
    virtual ~Behaviour() = default;
    virtual void execute(Object & object) = 0;
};

class Move : public Behaviour
{
public:
    Move() = default;
    virtual void execute(Object & object) override
    {
	object.set_x(object.get_x() + 1);
	object.set_y(object.get_y() + 1);
    }
};

class Display : public Behaviour
{
public:
    Display() = default;
    virtual void execute(Object & object) override
    {
	cout << object.get_x() << ", " << object.get_y() << endl;
    }    
};


Object::Object() : x{0}, y{0}, behaviours{} {}

void Object::add_behaviour(Behaviour* behaviour)
{
    behaviours.push_back(behaviour);
}

void Object::simulate()
{
    for (Behaviour* behaviour: behaviours)
    {
	behaviour -> execute(*this);
    }
}

void Object::set_x(int i)
{
    x = i;
}

void Object::set_y(int i)
{
    y = i;
}

int Object::get_x() const
{
    return x;
}

int Object::get_y() const
{
    return y;
}



int main()
{
    Object o1{};
    Move m1{};
    Display d1{};
    o1.add_behaviour(&m1);
    o1.add_behaviour(&d1);
    o1.simulate();
    o1.simulate();
    o1.simulate();
}