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* Re: c++/5724: Evaluation order of parameters for multiple operator<< calls
@ 2002-02-18 13:47 nathan
0 siblings, 0 replies; 3+ messages in thread
From: nathan @ 2002-02-18 13:47 UTC (permalink / raw)
To: RaoulGough, gcc-bugs, gcc-prs, nobody
Synopsis: Evaluation order of parameters for multiple operator<< calls
State-Changed-From-To: open->closed
State-Changed-By: nathan
State-Changed-When: Mon Feb 18 13:47:14 2002
State-Changed-Why:
no, there is no sequence point there. The code is
equivalent of
output (output (cout, f (a)), f (b));
where 'output' is the operator<< function. you'll see
that 'f (b)' can be called before or after
'output (cout, f (a))'
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5724
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: c++/5724: Evaluation order of parameters for multiple operator<< calls
@ 2002-02-18 12:26 Graham Stott
0 siblings, 0 replies; 3+ messages in thread
From: Graham Stott @ 2002-02-18 12:26 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/5724; it has been noted by GNATS.
From: Graham Stott <grahams@redhat.com>
To: RaoulGough@dial.pipex.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c++/5724: Evaluation order of parameters for multiple operator<<
calls
Date: Mon, 18 Feb 2002 20:18:34 +0000
Please supply a complete testcase.
^ permalink raw reply [flat|nested] 3+ messages in thread
* c++/5724: Evaluation order of parameters for multiple operator<< calls
@ 2002-02-18 11:06 RaoulGough
0 siblings, 0 replies; 3+ messages in thread
From: RaoulGough @ 2002-02-18 11:06 UTC (permalink / raw)
To: gcc-gnats
>Number: 5724
>Category: c++
>Synopsis: Evaluation order of parameters for multiple operator<< calls
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Mon Feb 18 11:06:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Raoul Gough
>Release: 2.95.3-5
>Organization:
>Environment:
Cygwin on Windows 2000
>Description:
I have an example where
cout << f(a) << f(b);
is calling f(b) before f(a), which I think is wrong. The operator<< is (in this case) a function call, so there should be a sequence point which guarantees evaluation order.
My apologies for submitting a bug on an old version.
>How-To-Repeat:
g++ gccseqtest.cc -o gccseqtest
./gccseqtest
Produces:
121
122
I think this should be:
122
122
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 3+ messages in thread
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2002-02-18 13:47 c++/5724: Evaluation order of parameters for multiple operator<< calls nathan
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2002-02-18 12:26 Graham Stott
2002-02-18 11:06 RaoulGough
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