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From: jagardner@orchid.UUCP
Newsgroups: comp.lang.c
Subject: Re: Does ANSI C have lengthof() ?
Message-ID: <10585@orchid.waterloo.edu>
Date: Tue, 8-Sep-87 18:35:38 EDT
Article-I.D.: orchid.10585
Posted: Tue Sep  8 18:35:38 1987
Date-Received: Thu, 10-Sep-87 02:40:16 EDT
References: <9154@brl-adm.ARPA> <1265@mhres.mh.nl> <5360@utcsri.UUCP>
Reply-To: datanguay@watbun.waterloo.edu (David Tanguay)
Organization: U. of Waterloo, Ontario
Lines: 16

In article <5360@utcsri.UUCP> flaps@utcsri.UUCP (Alan J Rosenthal) writes:
> [...]
>
>Besides Doug Gwyn's completely-correct comment that you should be
>saying "typedef char *numptr", this facility currently exists anyway:
>

According to the draft ANSI standard, "The expression shall be an
integral constant expression that shall not contain a sizeof operator" ...
This is in section 3.8.1, in reference to the "constant expression that
controls conditional inclusion". (draft Oct 1 1986)
I don't think it's cpp's place to know machine constants like sizeof.
The draft allows "void *" (generic pointer), so that should solve your
problems.

David Tanguay