Class not seeing its avaliable attributes

Hi again

one of my classes operations keeps throwing up errors saying it can't find data it should be able too.

the operation is AISnake::check_collision( ); and it is a friend of the food class

prepare for masses of code

AI Class

Code:

---

// Class: AISnake Implementation


        AISnake::AISnake(int x = 0, int y = 0)
        {
            //Image main_image(20, 20);
            ImageFile("../Assets/node2.tga").load(nodeimage2);

            AIsegments.push_front(Position(20,40));
            AIsegments.push_front(Position(40,40));
            AIsegments.push_front(Position(60,40));
            direction_ = 'n';
        }

        void AISnake::AIupdate()
        {

            AIsegments.pop_back();
            Position AI_p = AIsegments.front();



            // depends upon direction_
            switch(direction_)
            {
                case 'w':
                    AI_p.x_ -= 20;
                break;

                case 's':
                    AI_p.y_ -= 20;
                break;

                case 'e':
                    AI_p.x_ += 20;
                break;

                case 'n':
                    AI_p.y_ += 20;
                break;
            }

        AIsegments.push_front(AI_p);

        if (AI_p.x_ <= 0 || AI_p.x_ >= 800)
            {
                aFont.print((Image.background, 400, 300, Colour(0, 0, 0)), "You WIN!");
            }
        else if (AI_p.y_ <= 0 || AI_p.y_ >= 600)
            {
                aFont.print((Image.background, 400, 300, Colour(0, 0, 0)), "You WIN!");
            }
        }


        void AISnake::AIcheck_collision(int foodx, int foody, int snakex, int snakey)
        {

            int index = 0;

                while (index <= 6)

                    {
                        int foodx = foodpositions_[index].x_;
                        int foody = foodpositions_[index].y_;

                        int snakex = AI_p.x_;
                        int snakey = AI_p.y_;

                        if(snakex == foodx)
                            {
                                if(snakey == foody)
                                    {
                                        AIsegments.push_front((AI_p.x_ );

                                        for(int i= 0; i< 5 ; i++)
                                            {
                                                foodpositions_[index] = foodpositions_[index+1];
                                            }
                                    }
                            }
                    }

      }

---

food class attribuites

Code:

---

class food {

    //Attributes

    protected:

    int type_;
    Image foodImage_;
    int foodcount_;
    Position foodpositions_[5];
    friend void Snake::check_collision();
    friend void AISnake::AIcheck_collision();
  //  int foodpossiblepos[39];

---

the complier says that foodpositions_ is not declared in scope and niether is AI_p.x_ and AI_p.y_

why can't it find these?

thanks

ES

You have to have a food object in mind if you intend to get values of variables. Each and every different food object has its own foodpositions_ array, so you have to know which of those multitude of objects is the one you care about.