Header problems

[hakeris1010]

Hello! I'm making a program with lots of headers, but it doesn't link correctly, displaying the "not declared in this scope" error. How should i #include those headers correctly?

My files:

//main.cpp

using namespace std;

#include "world.h" 

//world.h

#ifndef WORLD_H_INCLUDED
#define WORLD_H_INCLUDED

#include "sfml_data.h"
#include "tile.h"
#include "entity.h"
#include "filedata.h" 

//sfml_data.h

#ifndef SFML_DATA_H_INCLUDED
#define SFML_DATA_H_INCLUDED

#include <SFML/Graphics.hpp>

sf::RenderWindow window;

const int tekstur_num=10;

sf::Texture teksturos[tekstur_num];

//tile.h

#ifndef TILE_H_INCLUDED
#define TILE_H_INCLUDED

#include <SFML/Graphics.hpp>

class Tile
{
    //some code
}

//tile.cpp

#include "tile.h"

//some code

sprites[i].setTexture(teksturos[picnum]);

//some code

window.draw(sprites[current_anim]);

The problem is that it says window and teksturos is not declared in this scope.

[Disch]

The problem is that it says window and teksturos is not declared in this scope.

They're not.

tile.cpp includes tile.h
tile.h includes SFML/Graphics.hpp and defines the tile class.


tile.cpp does not include ANYTHING that defines or includes 'window' or 'teksturos'. For that, it would need to include 'sfml_data' since that is where they are defined.


However... that will open up other problems because then you'd be defining those objects in multiple cpp files. So you'll get a linker error saying the objects are defined multiple times.



My advice: find a way to do this without using global variables.

[hakeris1010]

But i need to have those variables global, because they need to be loaded to memory only once, otherwise, loading them to memory from a file each time a tile is generated, it would slow down a performance very much!
Maybe i should try to make some class and load those sfml-data variables there?

[hakeris1010]

Using extern keyword in header file is the best option!