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From: dave@ur-helheim.UUCP
Newsgroups: net.lang,net.lang.c
Subject: Re: Re: ... C builtin functions?
Message-ID: <601@ur-helheim.UUCP>
Date: Wed, 16-Apr-86 12:36:45 EST
Article-I.D.: ur-helhe.601
Posted: Wed Apr 16 12:36:45 1986
Date-Received: Sat, 19-Apr-86 08:16:15 EST
References: <41@cbmvax.cbmvax.cbm.UUCP> <824@ttrdc.UUCP> <202@chronon.UUCP> <359@uvacs.UUCP>
Reply-To: dave@helheim.UUCP (Raver Dave)
Organization: U. of Rochester, EE Dept.
Lines: 27
Xref: watmath net.lang:2368 net.lang.c:8614

In article <359@uvacs.UUCP> rwl@uvacs.UUCP (Ray Lubinsky) writes:
>> >C has standard built-in functions????
>> 
>> It looks like a function invocation, and is known and understood
>> by the compiler...
>
>The thing is, sizeof() evaluates to a constant *at run time*, just like
>'c'<<3  or  BUFSIZ  .  That makes it a pretty trivial function.  All it
>really does is give you a portable, automatic facility for referring to
>system dependencies.
>
>Ray Lubinsky	University of Virginia, Dept. of Computer Science

< *  italics mine * >

sizeof and BUFSIZ and a good implementation of  'c' << 3 resolve to 
constants at *compile time*.  No run time *evaluation* is necessary.



-- 
"The Faster I Go the Behinder I Get"
--Lewis Carroll

Dave Carlson

{allegra,seismo,decvax}!rochester!ur-valhalla!dave