Path: utzoo!attcan!uunet!charyb!will
From: will@kfw.COM (Will Crowder)
Newsgroups: comp.lang.c
Subject: Re: IsUnsigned() function?
Message-ID: <1990Jul27.161339.14712@kfw.COM>
Date: 27 Jul 90 16:13:39 GMT
References: <1990Jul16.214155.5087@Neon.Stanford.EDU> <3539@sactoh0.UUCP> <104086@convex.convex.com> <RJC.90Aug25041948@brodie.uk.ac.ed.cstr>
Reply-To: will@kfw.com (Will Crowder)
Organization: KFW Corporation, Newbury Park, CA
Lines: 14

I promised myself I wouldn't get into this....

It sounds like the question has to do with whether or not a given
*type* is signed or unsigned for a given implementation.   That 
could be a useful thing to know, and ideally, the result would
be a compile-time constant.  The specific case I'm thinking of
char, which, according to ANSI, can be signed or unsigned as
the implementation desires.

What's wrong with:

#define IsUnsigned(type)	((type)0 - 1 > 0)

Will