Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ulysses!hector!jss
From: jss@hector.UUCP (Jerry Schwarz)
Newsgroups: comp.lang.c++
Subject: Re: associativity question for <<
Message-ID: <11605@ulysses.homer.nj.att.com>
Date: 27 May 89 03:32:38 GMT
References: <224@pink.ACA.MCC.COM>
Sender: netnews@ulysses.homer.nj.att.com
Reply-To: jss@hector.UUCP (Jerry Schwarz)
Organization: AT&T Bell Laboratories
Lines: 17

In article <224@pink.ACA.MCC.COM> rfg@MCC.COM (Ron Guilmette) writes:
>Consider the following short program.  In what order should
>the addition operations in "main" be performed?
>
>Does the language definition insist on any particular ordering
>for these addition operations?  If so, what is the required order?
>

C++, like C, does not in general (there are some well defined
exceptions) specify the order of evaluation of subexpressions or of
argument lists.  This is intended to provide the compiler with
flexibility to choose an efficient ordering. In cases where
subexpressions have side effects and order matters you must write the
code to explicitly force your desired order.

Jerry Schwarz
AT&T Bell Labs, Murray Hill