Newsgroups: comp.lang.c++
Path: utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: #pragma once (was Re: A solution to the multiple inclusion
Message-ID: <1989Oct30.180126.25138@utzoo.uucp>
Organization: U of Toronto Zoology
References: <14240@well.UUCP> <2082@plx.UUCP> <1989Oct27.163755.12976@paris.ics.uci.edu> <23464@cup.portal.com>
Date: Mon, 30 Oct 89 18:01:26 GMT

In article <23464@cup.portal.com> John_-_Nagle@cup.portal.com writes:
>     The "#pragma once" approach is a good idea.  But a pragma represents
>an explicitly nonstandard approach.  This should be standardized.
>
>     Common LISP has "require", which has the right semantics for this
>situation.  Perhaps we could use that keyword.

Better yet, why not mandate intelligent preprocessors, which recognize
include files that start with "#ifndef FOO_H" and end with "#endif"?
If we are going to mandate a change, why not mandate one that introduces
no new keywords and no incompatibility?
-- 
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