Using a header file in one code file and then vice versa? - c++

Question

So I've got a bit of a problem (well two but they're unrelated to each other).
I have two headers that look as follows:
Game.h
#ifndef INIT_GAME_H
#define INIT_GAME_H
#include <deps/deps.h>
#include <handlers/RenderHandler.h>
class Game {
private:
RenderHandler* renderHandler; /* <-- This is line 32 in my actual header */
public:
Game() {};
~Game() {};
int initialise();
void handleEvents();
void update();
void render();
void clean();
}; // class Game
#endif // INIT_GAME_H
RenderHandler.h
#ifndef HANDLERS_RENDERHANDLER_H
#define HANDLERS_RENDERHANDLER_H
#include <init/Game.h>
class RenderHandler {
private:
Game* game;
public:
RenderHandler() {};
~RenderHandler() {};
void initialise(Game* game);
void render();
}; // class RenderHandler
#endif // HANDLERS_RENDERHANDLER_H
But the above gives me an error during compilation:
game.h(32): error C2143: syntax error: missing ';' before '*'
game.h(32): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
game.h(32): error C2238: unexpected token(s) preceding ';'
As you've probably guessed, I'm trying to store Game's instance in RenderHandler and vice versa. I'm probably doing it completely the wrong way but I can't figure why it's not working.
Also, all ; are in their right places prior to line 32 in my header file.
EDIT:
after doing the suggested forward declaration, I get the following error (now in RenderHandler.cpp file).
Error: pointer to incomplete class type is not allowed
This is what my code file looks like
RenderHandler.cpp
#include <handlers/RenderHandler.cpp>
void RenderHandler::initialise(Game* game) {
this->game = game;
}
void RenderHandler::render() {
glfwSwapBuffers(game->getPrimaryWindow());
}

Answer 1

Use forward declaration :
#ifndef HANDLERS_RENDERHANDLER_H
#define HANDLERS_RENDERHANDLER_H
// FW declaration of Game
class Game;
class RenderHandler {
private:
Game* game;
public:
RenderHandler() {};
~RenderHandler() {};
void initialise(Game* game);
void render();
}; // class RenderHandler
#endif // HANDLERS_RENDERHANDLER_H