Path: utzoo!attcan!uunet!spool2.mu.edu!sdd.hp.com!usc!apple!mips!daver!tscs!tct!chip
From: chip@tct.uucp (Chip Salzenberg)
Newsgroups: comp.lang.c++
Subject: Re: Problems maintaining header files
Message-ID: <279DC35F.69CB@tct.uucp>
Date: 23 Jan 91 17:09:51 GMT
References: <15917@reed.UUCP>
Organization: Teltronics/TCT, Sarasota, FL
Lines: 15

According to minar@reed.bitnet (Nelson Minar,L08,x640,7776519):
>Unless I take precautions (either a '#pragma once' or a series of
>'#ifndef .. #define' the header is included twice ...

I routinely protect all my header files (C and C++) with both
"#ifndef FOO_H ... #define FOO_H ... #endif" and "#pragma once".

I also add "#ifdef __cplusplus ... extern "C" { ... #endif" and the
closing "}" to all my C header files.

It ain't pretty, but it avoids lots of headaches down the road.
-- 
Chip Salzenberg at Teltronics/TCT     <chip@tct.uucp>, <uunet!pdn!tct!chip>
       "If Usenet exists, then what is its mailing address?"  -- me
             "c/o The Daily Planet, Metropolis."  -- Jeff Daiell