"Identifier not found" C++ SDL. Help please?

[PaperDuckyFTW]

Heya *waves spastically*

A few weeks ago i made a topic asking help on a tile map system. I couldnt get any collision working so i decided jsut to go the hard way and impliment Lazy Foo's tilemap from his tutorial. So far my computer hasnt exploded so thats a good thing, but when i build it i get 2 errors:

error C3861: 'check_collision': identifier not found
error C3861: 'draw_surface': identifier not found

I looked up google for a solution but i found nothing so i thought you guys might have come accorss a simplar problem or know what im doing wrong. so far i have these files:

Code: Select all

main.cpp ( includes all the header files )
variables.h ( includes SDL.h, <string> and <fstream> )
functions.h  ( includes variables.h and classTile.h )
classTimer.h ( includes SDL.h and functions.h )
classPlayer.h ( includes SDL.h, functions and classTimer
classTile.h ( includes variables or functions, ive tried both and each singularly )

All of the header files have #ifndef, #define and #endif to declare them. I dont really know why i am getting that error and if you can help me, i would appreciate it. Have a nice day =]

[ultimatedragoon69]

should your draw_surface be apply_surface? did you include the functions into your code? It might help to see the code your having a problem with.

[PaperDuckyFTW]

thanks for your reply and sure. oh the draw_surface function is exactly the same as the apply_surfae, but i prefer it as draw because i dont think of it as applying, and i would refer to it as drawing

heres the parts of the ode thats cocking up. The errors are both in the tile class file.

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void Tile::draw()
{
	if( check_collision( camera, box ) == true )
	{
		draw_surface( box.x - camera.x, box.y - camera.y, tileSheet, screen, &clips[ type ] );
	}
}

Both the check collision and draw surfae functions in this function is what is coming up as unidentified. Both work in all the other files the function.h file is included it except the tile file.
I hope this can help you guys think of what could be wrong

[Maevik]

can you provide more info on how the functions are declared? are they just stand alone functions in functions.h or are they part of a class? if they are just functions, are you including the functions.h header file? do you have a circular include? is there a scope resolution operator you are missing? are they part of a namespace?

[PaperDuckyFTW]

okay heres the functions in the functions.h file that arent woking in the tile class

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void draw_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination, SDL_Rect* clip = NULL )
{
	SDL_Rect pos;
	pos.x = x;
	pos.y = y;
	
	SDL_BlitSurface( source, clip, destination, &pos );
}

Code: Select all

bool check_collision( SDL_Rect A, SDL_Rect B )
{
    //The sides of the rectangles
    int leftA, leftB;
    int rightA, rightB;
    int topA, topB;
    int bottomA, bottomB;

    //A's rect
    leftA = A.x;
    rightA = A.x + A.w;
    topA = A.y;
    bottomA = A.y + A.h;
        
    //B's rect
    leftB = B.x;
    rightB = B.x + B.w;
    topB = B.y;
    bottomB = B.y + B.h;

    //if the rects are sexually interwined
    if( bottomA <= topB )
    {
        return false;
    }
    
    if( topA >= bottomB )
    {
        return false;
    }
    
    if( rightA <= leftB )
    {
        return false;
    }
    
    if( leftA >= rightB )
    {
        return false;
    }
    
    //If none of the sides from A are outside B
    return true;
}

The functions are not part of any class.

[Maevik]

If I understand correctly, then your problem is definitely a circular include. The error you are getting is trying to call draw_surface and check_collision from the Tile Class (classTile.h)

functions.h includes classTile.h and classTile.h includes functions.h. I know you said it also fails if you include variables.h instead, but this obviously gives you the same error since without functions.h it still doesn't know wtf draw_surface and check_collision are.

What you need to do is design your system so that you are only using singular dependency. I would think that the easiest way to do this with what you have is to make functions.h operate without needing classTile.h.

Good Luck and I hope this helps!

[PaperDuckyFTW]

Hey man thanks for your reply. Your 1 Billion % right. Functions.h and tile.h both include each other and i thought this might be a problem but wasnt to sure. I'll knuckle down and think of how i can make either one included without the other. Yerr, ill try and fix it, sorry if that previous sentance made no sense. Btw, what are you working on? Sorry monds if thiws is off topic. Thanks, ill see if i can get it working

[Maevik]

Hey man thanks for your reply. Your 1 Billion % right. Functions.h and tile.h both include each other and i thought this might be a problem but wasnt to sure. I'll knuckle down and think of how i can make either one included without the other. Yerr, ill try and fix it, sorry if that previous sentance made no sense. Btw, what are you working on? Sorry monds if thiws is off topic. Thanks, ill see if i can get it working

Awesome! Glad you got it figured out. What am I working on? I'm working on a small 2D shoot-em-up game. This is the thread if you want to check it out.