#define __RESOURCE_H__

Hi all,
I'm a c++ beginner (coming from java) and I'm struggling to understand what the directive "#define __RESOURCE_H__" in the code below does.

I understand this could sound like a silly question, but I can't find any other reference to __RESOURCES_H__ in all the rest of the program sources and I don't understand the need of it.

Thanks in advance for your help!

#if !defined(__RESOURCES_H__)
#define __RESOURCES_H__

//To be reviewed based on game dynamics
#define MAX_SYMBOL_TYPES   9

#include "Iw2D.h"
#include "Iw2DSceneGraph.h"

using namespace Iw2DSceneGraph;

/**
 * @class Resources
 *
 * @brief Resources class
 *
 * The that manages the lifetime of the following types of resources:
 * - Images
 * - Fonts
 * - Atlases
 */
class Resources
{
protected:
    CIw2DImage*     Gem;
    CIw2DImage*     MenuBG;
    CIw2DImage*     GameBG;
    CIw2DImage*     MenuButton;
    CIw2DImage*     Placard;
    CIw2DImage*     PauseIcon;
    CIw2DImage*     PlayButton;
    CIw2DFont*      Font;

public:
    CIw2DImage*     getGem()                    { return Gem; }
    CIw2DImage*     getMenuBG()                 { return MenuBG; }
    CIw2DImage*     getGameBG()                 { return GameBG; }
    CIw2DImage*     getMenuButton()             { return MenuButton; }
    CIw2DImage*     getPlacard()                { return Placard; }
    CIw2DImage*     getPlayButton()             { return PlayButton; }
    CIw2DImage*     getPauseIcon()              { return PauseIcon; }
    CIw2DFont*      getFont()                   { return Font; }

public:
    Resources();
    ~Resources();
};

extern Resources* g_pResources;

#endif  // __RESOURCES_H__

LB (13399)

It's part of an inclusion guard - look at the line immediately before it and think about what happens if this file is included twice or more.

http://en.wikipedia.org/wiki/Include_guard

The C/C++ header and source file system is widely agreed to be bad, and currently the C++ standards committee is working toward a new Modules system that will be more like other languages you are familiar with. However, headers will remain for many years.

Last edited on

virtueed (2)

wow, amazing. Multiple inclusion avoidance has to be manually managed! That's absolutely clear now.

Very valuable answer, you have saved me from a big headache :-)

Thank you a lot, very much appreciated.

Cheers

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#define __RESOURCE_H__