Cross include

BlueTeeth · #1 24-Mar-2004, 02:17

hi all,i have some problem and i`m not sure about the source
i have 2 classes

CPP / C++ / C Code:

#include "slot.h"
class cell
{
private:
	char content;
	bool occupied;
	bool SlotBegin;      // TRUE if this cell is the begining of slot
	slot* BlngTo;        // Points to slot it belongs to

CPP / C++ / C Code:

#include <string>
#include "cell.h"
using std::string ;

class slot
{
private:
	int row,col,size;
	char dir;
	string content;
	bool occupied;
	vector<cell*> contain;  // POINTERS to cells it contains

these were part of the interface of the 2 classes and it gives me errors at compiling is it because i can`t include cell.h in slot.h and in the same time include slot.h in cell.h ? if so what`s the solution?!
thnx in advance

dsmith · #2 24-Mar-2004, 07:22

Hi BlueTeeth.

I found a little trick that is implemented in all of the standard libraries. You need to include these files, but you don't want to include them if they are already included.

So at the very top of includes, I always put:

CPP / C++ / C Code:

#ifndef __HEADER_NAME
#define __HEADER_NAME

And at the end put:

CPP / C++ / C Code:

#endif //__HEADER_NAME

Your __HEADER_NAME is a unique name based on your file, I ussually use things like __CROSS_H.

This way, the include file will be gone through only once, even if it is included by several files.

HTH
d

BlueTeeth · #3 24-Mar-2004, 20:29

Quote:

Originally Posted by dsmith

Hi BlueTeeth.

I found a little trick that is implemented in all of the standard libraries. You need to include these files, but you don't want to include them if they are already included.

So at the very top of includes, I always put:

CPP / C++ / C Code:

#ifndef __HEADER_NAME
#define __HEADER_NAME

And at the end put:

CPP / C++ / C Code:

#endif //__HEADER_NAME

Your __HEADER_NAME is a unique name based on your file, I ussually use things like __CROSS_H.

This way, the include file will be gone through only once, even if it is included by several files.

HTH
d

i did that in the top of my files but i didn`t copy it

but my problem is that in the "cell.h" i want to include "slot.h" and in the same time in the "slot.h" i need to include "cell.h" ?!
i mean for example when compiling cell.cpp the compiler will need "slot.h" while the slot.h contains some "cell" members!!what`s the solution

WaltP · #4 24-Mar-2004, 20:37

Quote:

Originally Posted by BlueTeeth

i did that in the top of my files but i didn`t copy it

meaning what exactly?

Quote:

Originally Posted by BlueTeeth

but my problem is that in the "cell.h" i want to include "slot.h" and in the same time in the "slot.h" i need to include "cell.h" ?!

The solution is exacty what dsmith described to you.

Quote:

Originally Posted by BlueTeeth

i mean for example when compiling cell.cpp the compiler will need "slot.h" while the slot.h contains some "cell" members!!what`s the solution

slot.h has part of the cell class inside it? If so, rethink your code.

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