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Mutual Inclusion

Mutual Inclusion

Mutual Inclusion

I realise this seems a stupid question but I have googled this to death with no results so here goes:

I have two files, game.h and player.h. Each contains a reference to the other.

I started by simply putting an include to the other each file. This resulted in an infinite loop when I compiled the program, fair enough really!

So I tried the following, which I found in a c++ forum.


#ifndef PLAYER_H
#define PLAYER_H

class Player() {
thisIsAFunction( Game&; );



#ifndef GAME_H
#define GAME_H

class Game() {


The problem I have now is that the compiler reports an error on the thisIsAFunction( Game&; ); line. 'Game' has not been declared.

I should mention that the main.cpp file includes game.h, the game class (an instance of which is created by the main() function) has a member of type Player and the method in the Player class requires a Game object to be passed to it (otherwise I wont be able to draw to the screen!!)

Does anyone know any way around my problem? If I cant do this mutual inclusion thing it could make my code almost unmanageably longer!!!

I am using the gcc complier (i think, not sure how to check!) and using Code::Blocks IDE.


RE: Mutual Inclusion



#ifndef PLAYER_H
#define PLAYER_H

class Game;
class Player() {
thisIsAFunction( Game&; );

It's a forward reference, which tells the compiler that Game will be properly declared later.  But for now, it only knows that the class exists.  So you can't create instances of a Game, but you can point to a Game.

If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.

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