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From: jacob@gore.com (Jacob Gore)
Newsgroups: comp.lang.c
Subject: Re: A solution to the multiple inclusion problem
Message-ID: <470005@gore.com>
Date: 24 Oct 89 18:14:07 GMT
References: <14240@well.UUCP>
Reply-To: jacob@gore.com (Jacob Gore)
Organization: Gore Enterprises
Lines: 15

/ comp.lang.c / mgordon@lotus.com (PCSD Mac) / Oct 24, 1989 /
How about a new preprocessor directive that means "include this file only 
if it hasn't already been included", say "#require"?  The "preprocessor"
would simply keep a table of files that have already been included and use 
it to avoid including the same #required file more than once.  There will 
always be files you really do want to #include multiple times, so you can't
change the meaning of #include.
----------

Objective-C uses "#import" for just this.  It's very convenient.  (And
portable to all Objective-C implementations:-)

Jacob
--
Jacob Gore		Jacob@Gore.Com			boulder!gore!jacob