Xref: utzoo comp.lang.c:23286 comp.lang.c++:5223 gnu.g++:477
Newsgroups: comp.lang.c,comp.lang.c++,gnu.g++
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: A solution to the multiple inclusion problem
Message-ID: <1989Oct25.164145.29980@utzoo.uucp>
Organization: U of Toronto Zoology
References: <14240@well.UUCP> <11396@smoke.BRL.MIL>
Date: Wed, 25 Oct 89 16:41:45 GMT

In article <11396@smoke.BRL.MIL> gwyn@brl.arpa (Doug Gwyn) writes:
>>      I propose a solution via compiler optimization.
>
>Your solution does not at all seem to me to preserve existing semantics.

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.
-- 
A bit of tolerance is worth a  |     Henry Spencer at U of Toronto Zoology
megabyte of flaming.           | uunet!attcan!utzoo!henry henry@zoo.toronto.edu