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From: jv@mhres.mh.nl (Johan Vromans)
Newsgroups: comp.lang.c
Subject: Re: Does ANSI C have lengthof() ?
Message-ID: <1295@mhres.mh.nl>
Date: Wed, 9-Sep-87 04:08:44 EDT
Article-I.D.: mhres.1295
Posted: Wed Sep  9 04:08:44 1987
Date-Received: Thu, 10-Sep-87 06:51:54 EDT
References: <9154@brl-adm.ARPA> <1265@mhres.mh.nl> <5360@utcsri.UUCP>
Organization: Multihouse N.V., The Netherlands
Lines: 32

In article <5360@utcsri.UUCP> flaps@utcsri.UUCP (Alan J Rosenthal) writes:
|
|In article <1265@mhres.mh.nl> jv@mhres.mh.nl (Johan Vromans) writes:
|>I think there is more need for these functions in the pre-processor:
|>
|>    # if sizeof (char*) == sizeof (int)
|>    [...]
|>    # endif
|
|Besides Doug Gwyn's completely-correct comment that you should be
|saying "typedef char *numptr", this facility currently exists anyway:
|
|    #if sizeof(char *) == sizeof(int)
|    [...]
|    #endif
|

Has your C-preprocessor "sizeof" built-in? Quite exceptional.

|And, of course, you could always use "#define numptr int" so that you
|could later "#ifdef numptr".

The point is that on 16/32 bit machines (like IBM-PC) I need to have a
"long" hole to store a pointer (for whatever purpose), and on 16 bit
machines I need an "int" hole. And I want the pre-processor and/or
compiler to arrange this for me, so I have portable sources.


-- 
Johan Vromans                              | jv@mh.nl via European backbone
Multihouse N.V., Gouda, the Netherlands    | uucp: ..{?????!}mcvax!mh.nl!jv
"It is better to light a candle than to curse the darkness"