sort(this->sprites.begin(), this->sprites.end(), [](const struct SpriteInfo & s1, const struct SpriteInfo & s2) {

        return s1.priority > s2.priority;

    });

typedef function<void (string &)> callback;

void func(string &data)

{

    data = "YES";

    cout << data << endl;

}

void callee(string &data, callback call)

{

    call(data);

}

int main()

{

    string data;

    //callback call = &(func);

    //callee(data, call);

    callback call = [] (string data) { cout << "YES" << endl; };

    call(data);

    return ;

}