Article View: comp.std.c
Article #1065Re: Bounds checks. (was variable-length struct hack)
From: Richard H. Gumpertz
Date: Tue, 12 Dec 1989 14:06
Date: Tue, 12 Dec 1989 14:06
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1676 bytes
In article <1989Dec11.181631.3864@jarvis.csri.toronto.edu> norvell@csri.toronto.edu (Theo Norvell) writes:
> int A[N], *p;
> for(p=A; p < A+N ; ++p ) { ... } /* Good */
> for(p=A; p < &A[N] ; ++p ) { ... } /* Undefined! */
Gee, that is kind of interesting. Is the result of &A[N] "used as an
operand of the unary * operator" (which is prohibited in 3.3.6)? That
is, does the & operator cancel out the * implicit in [...]? I think some
special language might be required in 3.3.6 to allow &* without
undefined results, since this is probably what the committee desired
anyway. It would be silly to allow A+N but not &A[N]!
--
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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!aplcen!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!wuarchive!texbell!attctc!kcdev!pars!cpsolv!rhgReferences:
<448@longway.TIC.COM> <450@longway.TIC.COM> <15364@haddock.ima.isc.com> <809@prles2.UUCP> <1989Dec8.161820.24804@jarvis.csri.toronto.edu> <1989Dec11.181631.3864@jarvis.csri.toronto.edu>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!aplcen!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!wuarchive!texbell!attctc!kcdev!pars!cpsolv!rhg From: rhg@cpsolv.UUCP (Richard H. Gumpertz) Newsgroups: comp.std.c Subject: Re: Bounds checks. (was variable-length struct hack) Message-ID: <465@cpsolv.UUCP> Date: 12 Dec 89 14:06:39 GMT References: <448@longway.TIC.COM> <450@longway.TIC.COM> <15364@haddock.ima.isc.com> <809@prles2.UUCP> <1989Dec8.161820.24804@jarvis.csri.toronto.edu> <1989Dec11.181631.3864@jarvis.csri.toronto.edu> Reply-To: rhg@cpsolv.uucp (Richard H. Gumpertz) Organization: Computer Problem Solving, Leawood, Kansas Lines: 17