Re: Error Return (was Re: (char *)(-1))

Article View: comp.std.c

Article #413

#413

From: David Keppel
Date: Fri, 04 Aug 1989 17:09

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iiitsh@cybaswan.UUCP (Steve Hosgood) writes:
>[errval(foo())]

Until it is `prior art', it probably doesn't belong in dpANS C.

Often, `-1' is used as a return value for things that can be array
indicies, because `-1' can't be an array index.  Having `errval'
requires that you know not just the return type, but also which kinds
of values are going to be meaningful (since, e.g., not all compilers
have condition codes).  To do this `right', you need a stronger typing
system than C provides.

	;-D on  ( Stronger types, with 40% more resolving power! )  Pardo
-- 
		    pardo@cs.washington.edu
    {rutgers,cornell,ucsd,ubc-cs,tektronix}!uw-beaver!june!pardo

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<GEOFF.89Jun11231924@onyx.cs.warwick.ac.uk| <2619@yunexus.UUCP| <388@celit.UUCP| <118@psitech.UUCP| <1063@tukki.jyu.fi| <1282@cbnewsl.ATT.COM| <617@prles2.UUCP| <220@ssp1.idca.tds.philips.nl> <594@cybaswan.UUCP>

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!uw-june!pardo
From: pardo@june.cs.washington.edu (David Keppel)
Newsgroups: comp.std.c
Subject: Re: Error Return (was Re: (char *)(-1))
Keywords: error, flag, exception
Message-ID: <8912@june.cs.washington.edu>
Date: 4 Aug 89 17:09:21 GMT
References: <GEOFF.89Jun11231924@onyx.cs.warwick.ac.uk| <2619@yunexus.UUCP| <388@celit.UUCP| <118@psitech.UUCP| <1063@tukki.jyu.fi| <1282@cbnewsl.ATT.COM| <617@prles2.UUCP| <220@ssp1.idca.tds.philips.nl> <594@cybaswan.UUCP>
Reply-To: pardo@uw-june.cs.washington.edu (David Keppel)
Organization: University of Washington, Computer Science, Seattle
Lines: 16

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