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From: ark@alice.UucP (Andrew Koenig)
Newsgroups: net.lang,net.lang.c
Subject: Re: structured assembler (BASIC)  [Really: C builtin functions?]
Message-ID: <5341@alice.uUCp>
Date: Thu, 24-Apr-86 15:58:43 EST
Article-I.D.: alice.5341
Posted: Thu Apr 24 15:58:43 1986
Date-Received: Sat, 26-Apr-86 05:01:51 EST
References: <375@hadron.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 14
Xref: watmath net.lang:2395 net.lang.c:8727

> Any operator which maps its args into a unique value in its range
> defines an operation which is a function.  Just because you can
> say a + b doesn't mean that (plus a b) [resp., plus(a, b)] is not
> a function.  Similarly, sizeof(i), whether or not you use parens
> (and I always do) is an operator which, of course, is a function.

> Were you talking about details of implementation, perhaps?

The C definition of "function" is not the same as the mathematical
definition.  A C function is a part of a program.  A mathematical
function is a set of ordered pairs that meet certain conditions.

That said, note that sizeof(i) is syntactically a constant.  This
would not be true if sizeof were a function.