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why are my classes unknown?

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why is the line 'class gameGFX;' needed? Its declared in gameGFX which is included... But without that line it doesnt recognize gameGFX. Thanks #ifndef MAIN_H #define MAIN_H #include <hge.h> #include <hgesprite.h> #include <hgefont.h> #include <hgeparticle.h> #include <hgecolor.h> #include <fmod.h> #include <list> //non-game specific #include "def.h" #include "basic.h" #include "gameGFX.h" #include "gameGUI.h" //game specific #include "world.h" #include "actor.h" extern HGE * hge; class gameGFX; extern world www; extern gameGFX gfx; extern gameGUI gui; #endif

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An related issue:

I have a int2 class in basic.h
I have a unit class which need this class in unit.h
I have a main.h which holds all header-files so i include that one in other files.

In unit.h i include main.h so my unit can have int2 as members.
If i include unit.h in main.h (below basic.h) the int2 in unit.h is suddenly unknown!

why? the basic-header is above it?


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