Path: utzoo!attcan!uunet!aplcen!haven!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.std.c
Subject: Re: sequence points
Message-ID: <13261@smoke.BRL.MIL>
Date: 28 Jun 90 15:58:43 GMT
References: <1988@mcrware.UUCP> <103459@convex.convex.com>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 13

In article <103459@convex.convex.com> grogers@convex.com (Geoffrey Rogers) writes:
>>	func1(<argument list>) + func2(<argument list>)
>The dp ANSI, Dec 89, page 42, states "The order of evaluation of the function
>designator, the arguments, and subexpressions within the arguments are 
>unspecified, but there is a sequence point before the actual call". This
>would lead me to believe that you can evaluate all of the arguments for
>both functions before calling either one.

The important point is that the + operator does not impose an order of
evaluation on its operands.  As you note, the arguments to a function
must be completely evaluated (including side effects) before the
function is called.  How much before is not specified, other than that
it must be after the previous sequence point.