[C] The FAR in typedef

koyi · 07-21-2006, 12:34 PM

Hi, I have come across this typedef declaration in the header files of libjpeg62:

Code:

typedef JSAMPLE FAR *JSAMPROW;

Could somebody tell me what "FAR" means in this declaration?

Thanks.

jim mcnamara · 07-21-2006, 01:22 PM

16 bit systems use a FAR pointer when the pointer references something outside
the sixteen bit address space range. Some old code for Windows 3.1 and for DOS uses that. It is probably a #define in a header.

I would bet if you're on a 32-bit box that

Code:

#define FAR

is in effect ewhen you compile.

koyi · 07-21-2006, 07:37 PM

Thanks for the answer