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some1 · Apr 27th, 2005, 10:14 AM

How to prevent header files from being included twice?
My code is messed up and I need to include lots of .h files in other files so I get errors from the linker that X is already defined in x.obj file.

I tried using inclusion guards like this:

#ifndef INC_HEADER1
#define INC_HEADER1

<file content goes here>

#endif

and also tried

#pragma once

but i still get the same errors
But even if i include e.g windows.h or string.h a hundred times i never get linker errors about them.

help?

Apr 27th, 2005, 10:14 AM	#1
some1 Programmer Join Date: Dec 2004 Posts: 50 Rep Power: 4	Including header files How to prevent header files from being included twice? My code is messed up and I need to include lots of .h files in other files so I get errors from the linker that X is already defined in x.obj file. I tried using inclusion guards like this: #ifndef INC_HEADER1 #define INC_HEADER1 <file content goes here> #endif and also tried #pragma once but i still get the same errors But even if i include e.g windows.h or string.h a hundred times i never get linker errors about them. help?