Need help with forward declarations

[caiusg]

Hi there!
I'm learning Cinder and C++ and I'm stuck with forward declarations.

I have two classes and I would like to access each other: brick uses track and track uses brick.

Can you help me to solve this? I spent many hours and I still can't find a solution. This almost works now, but I cannot access anything from track within brick.


I've also tried separating the implementation of brick.h to brick.cpp, but it broke everything.

main.cpp

#include "cinder/app/AppBasic.h"
#include "cinder/gl/gl.h"

#include "track.h"
#include "player.h"

using namespace ci;
using namespace ci::app;
using namespace std;

class game_ver_2App : public AppBasic
{
	public:
		void setup();
		void update();
		void draw();
		void prepareSettings( Settings *settings );

	private:
		track		mTrack;
};

void game_ver_2App::prepareSettings( Settings *settings )
{
}
void game_ver_2App::setup()
{
}

void game_ver_2App::update()
{
}

void game_ver_2App::draw()
{
}

CINDER_APP_BASIC( game_ver_2App, RendererGl )



brick.h

#pragma once

#include "track.h"

class track;

class brick
{
	public:
		brick();
		void setTrack(track &theTrack);

	private:
		track *mTrack;
};

brick::brick()
{

}

void brick::setTrack(track &theTrack)
{
	mTrack = &theTrack;
	int b = mTrack->a;
}

track.h

#pragma once

#include <math.h>
#include "cinder/vector.h"
#include "cinder/BSpline.h"
#include "cinder/Rand.h"

#include "brick.h"

using namespace ci;
using namespace std;

class track
{

	public:
		track();
		int a;
	private:
		vector<brick> brickPositions;
};

track::track()
{
}

[kbw]

brick.h should not include track.h. By including it you're not really using a forward declaration.

track.h shouldn't include brick.h. And you need to change the vector declaration to:

class track
{
public:
	track();
	int a;

private:
	std::vector<brick*> brickPositions;
};

And don't put that using namespace stuff in header files.

[caiusg]

Thank you for helping!

I managed to solve it!