Simple question about header files

[Virtek]

I've got two header files: // This is file1.h #include "file2.h" __gc class Class1 { .... }; // This is file2.h #include "file2.h" __gc class Class2 { .... } I want both files to "know" each other, but it becomes an endless loop when i try to #include each other... Any idia ? Thanks

[Virtek]

Correction about the file2.h file: #include "file1.h" of-course

[2bee]

Hi Virtek, cross including seems kinda up to date problem. I would suggest that you add #pragma once to both of your header files. #pragma once "Specifies that the file will be included (opened) only once by the compiler when compiling a source code file." Furthermore those two threads might be interesting to you as well. http://www.codeproject.com/script/comments/forums.asp?msg=1401063&forumid=3785#xx1401063xx http://www.codeproject.com/script/comments/forums.asp?msg=1422933&forumid=3785#xx1422933xx regards Tobias

[mcljava]

Fundamental to the header files is the preprocessor. In order to avoid Multi-Inclusion you need a to tell the preprocessor to only include the header under certain conditions. For example, file1.h #ifndef __FILE_1_H__ #define __FILE_1_H__ ... #endif Now with that said, you probably need to revisit your header file design because you should not have a situation where File1 is including File2 and visa versa. If there is common definitions or structures, put those in a separate header. Keep the module specific data in the header that applies to the .CPP or .C module. You application might then look like: file1.h #include "File1.h" #include "CommonData.h" ... file2.h would be similar. Good Luck Mike Luster CTI/IVR/Telephony SME

[Divyang Mithaiwala]

Do you know why C apply .h & .c file concept. Becoz in .h file you do all declaration & in .c file you define all function. so what you do for both header file make .c/.cpp file(which you already done.). & include file1.h in file2.cpp & file2.h in file1.cpp. so it is not endless loop.

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Divyang Mithaiwala System Engineer & Software Developer

[Saksida Bojan]

Divyang Mithaiwala wrote:

so it is not endless loop.

It is. Unless you add the folowing

#ifndef _FILE1_H_ // At the beginning of .h file
#define _FILE1_H_ // Win32 style for declaring .h file

#endif // at the end of .h file