Enum Header Multiple Defnitions

Question

I've got this "multiple Definitions" Error and don't know who to fix it.

header.h

    #ifndef HEADER_H
     #definde HEADER_H

     enum Gamestate{
         MENU,
         PLAY,
         PAUSE,
         GAMEOVER
        };
     Gamestate GAMESTATE = MENU;

#endif

main.cpp

#include "header.h"

switch(GAMESTATE){...}

If I put the Gamestate GAMESTATE = MENU; in the header.cpp main.cpp doesn't know the variable. If I compile it this way I get the multiple Def . Error.

Pete Becker · Accepted Answer · 2016-01-31 11:53:04Z

2

You should declare the global variable extern in the header:

 #ifndef HEADER_H
 #definde HEADER_H

 enum Gamestate{
     MENU,
     PLAY,
     PAUSE,
     GAMEOVER
    };

 extern Gamestate GAMESTATE;

 #endif

and provide a definition in any of your .cpp files:

 Gamestate GAMESTATE = MENU;

edited Jan 31, 2016 at 11:53

Pete Becker

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answered Jan 31, 2016 at 11:17

πάντα ῥεῖ

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Vlad from Moscow · Accepted Answer · 2016-01-31 11:17:49Z

1

It means that header "header.h" is included in more than one compilation unit.

In this case variable GAMESTATE is defined in each module that includes the header.

You should declare the variable without its definition in the header the following way

extern Gamestate GAMESTATE;

and then for example in main.cpp define it like

Gamestate GAMESTATE = MENU;

answered Jan 31, 2016 at 11:17

Vlad from Moscow

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