Help with error, working with classes

[Hengad]

I am doing something wrong here, don't just know what, when compiling it says drawSnake was not declared in this scope. I have just succeeded making pong game, now I am trying to make snake game.

In Game.cpp I call drawSnake like this:

drawSnake();

Game.h:

#include <SFML/Graphics.hpp>

#ifndef GAME_H
#define GAME_H

class Game : public Snake
{
    public:
        Game();
};

#endif // GAME_H

In Snake.cpp I have made the drawSnake() function, it doesn't have errors:

void Snake::drawSnake()
{
    for(int i = 0; i < snake.size(); i++)
    {
        window.draw(snake);
    }
}

Snake.h:

#include <SFML/Graphics.hpp>
#include <vector>

#ifndef SNAKE_H
#define SNAKE_H

class Snake : public Game
{
    public:
        Snake();
        void drawSnake();
};

#endif // SNAKE_H

Even they are kind of long I tried to shorten them.

[Satus]

class Game : public Snake
class Snake : public Game

What?

[Hengad]

Yup, I need stuff in Game that is in Snake, and vice versa.

[Satus]

Yup, I need stuff in Game that is in Snake, and vice versa.

That is not quite what inheritance is for. You should read some books about C++ and OOP before you start coding games 

[Hengad]

Well yes, I ordered 2 books yesterday, but they haven't arrived yet. I know that is not why inheritance is, but in my snake class I need game class for window to draw the snake, and in game class I need snake to use functions in snake class.. How should I do this?

[Satus]

What you probably need is Composition or Aggregation.
Make you Snake a field inside Game, and if you need to access Game from Snake (though you should try to avoid child-to-parent relationships if possible), then pass a pointer to Game to you Snake object.
wikipedia