enum and struct definition

Question

I have errors when compiling my project with codeblocks. My problem comes from a enum definition, and from a struct definition.

They are bot defined in a header file, that worked since i was only using those enum and struct in the .c associated file. But when i include the .h file in another .c file, i get errors, here is some code;

maps.h

#include <stdlib.h>
#include <stdio.h>

enum Property { BACKGROUND, FOREGROUND, BLOCK, EVENT };

typedef struct {
   char map_name[50];
   int width;
   int height;
   char* map_struct;
}rpgMap;
char getTileProperty(rpgMap map, int x, int y, int property);

maps.c

#include "maps.h"

char getTileProperty(rpgMap map, int x, int y, int property){    // Works
   char value = NULL;
   value = map.map_struct[(((y*(map.width-1))+y+x) * 4 ) + property];
   return value;
}   
rpgMap loadMap(unsigned char* map){
   rpgMap Map;
       //....
       //some code
       //...
   return Map;
}
// This works until i include maps.h in another .c file

So here's the stuff, when i include maps.h in eg. game.c or game.h i have this error;

error: nested redefinition of 'enum Property'

I don't get it !

Answer 1

You need to add header guards to your header files otherwise you will get multiple declarations.

For example, for your maps.h surround it with this:

#ifndef MAPS_H
#define MAPS_H

...


#endif