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Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!ginosko!aplcen!haven!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.lang.c,comp.lang.c++,gnu.g++
Subject: Re: A solution to the multiple inclusion problem
Message-ID: <11424@smoke.BRL.MIL>
Date: 27 Oct 89 17:53:23 GMT
References: <14240@well.UUCP> <11396@smoke.BRL.MIL> <1989Oct25.164145.29980@utzoo.uucp>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 12

In article <1989Oct25.164145.29980@utzoo.uucp> henry@utzoo.uucp (Henry Spencer) writes:
-Can you elaborate on this, Doug?  Seems to me like what he was proposing --
-have compiler recognize files bracketed with `#ifndef FOO_H' and remember
-the bracketing -- comes under the "as if" rule.  Re-including such a file
-with FOO_H defined cannot possibly have any effect except to slow down
-the compilation.

I received some private correspondence on this also, and apparently I
didn't grasp the actual meat of the proposal.

I suppose if further #undef/#define of the identifier were properly
tracked, it would work.