Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!usc!orion.oac.uci.edu!uci-ics!rfg
From: rfg@ics.uci.edu (Ron Guilmette)
Newsgroups: comp.lang.c++
Subject: Re: A solution to the multiple inclusion problem
Message-ID: <1989Oct27.170429.14184@paris.ics.uci.edu>
Date: 28 Oct 89 00:04:29 GMT
References: <DLD.89Oct25104101@F.GP.CS.CMU.EDU>
Reply-To: Ron Guilmette <rfg@ics.uci.edu>
Organization: University of California, Irvine - Dept of ICS
Lines: 24

In article <DLD.89Oct25104101@F.GP.CS.CMU.EDU> dld@F.GP.CS.CMU.EDU (David Detlefs) writes:
>Conclusion: IMHO, anybody who's read Nagle's post and implements a C
>preprocessor (or compiler that incorporates one) and doesn't use the
>technique doesn't recognize a good thing when it walks up and sits in
>his/her lap.  Even if your CPP incorporates a mechanism such as
>#pragma once, this will still help if the compiler is used on any of
>the vast existing body of code that doesn't use #pragma once.

Regarding that "vast existing body of code", I have a little csh script
for you:

	#!/bin/csh

	foreach file (*.h)
		cp $file /tmp/$file
		rm -f $file
		echo #pragma once > $file
		cat /tmp/$file >> $file
		rm -f /tmp/$file
	end

If you don't grok csh, I will interpret.

// rfg