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* c++/9334: args to cout evaluated prematurely
@ 2003-01-15 20:46 bala
0 siblings, 0 replies; 2+ messages in thread
From: bala @ 2003-01-15 20:46 UTC (permalink / raw)
To: gcc-gnats
>Number: 9334
>Category: c++
>Synopsis: args to cout evaluated prematurely
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Jan 15 12:46:03 PST 2003
>Closed-Date:
>Last-Modified:
>Originator: Bala Swaminathan
>Release: 2.95.3
>Organization:
>Environment:
LINUX:
monsterd01:~/c++> uname -a
Linux monsterd01 2.4.18-3-rmap12h-lvm105 #1 SMP Wed Aug 7 17:54:19 EDT 2002 i686 unknown
monsterd01:~/c++> /usr/bin/g++ -v
Reading specs from /usr/lib/gcc-lib/i486-suse-linux/2.95.3/specs
gcc version 2.95.3 20010315 (SuSE)
>Description:
a cout statement in is causing the gcc version 2.95.3 20010315 (SuSE) in Linux to prematurely pass the value of an int variable before any preceeding operator<< is evaluated on the cout.
(See "How-To-Repeat:" for the program)
// LINUX
monsterd01:~/c++> uname -a
Linux monsterd01 2.4.18-3-rmap12h-lvm105 #1 SMP Wed Aug 7 17:54:19 EDT 2002 i686 unknown
monsterd01:~/c++> /usr/bin/g++ -v
Reading specs from /usr/lib/gcc-lib/i486-suse-linux/2.95.3/specs
gcc version 2.95.3 20010315 (SuSE)
monsterd01:~/c++> /usr/bin/g++ linuxcout.C
monsterd01:~/c++> a.out
foo(&x): 100, x: 1111
//SUN
booby:~/c++> uname -a
SunOS booby 5.8 Generic_108528-16 sun4u sparc SUNW,Sun-Blade-100
booby:~/c++> g++ -v
Reading specs from /usr/local/gnu/install/gcc/2.9.5.2/lib/gcc-lib/sparc-sun-solaris2.6/2.95.2/specs
gcc version 2.95.2 19991024 (release)
booby:~/c++> g++ linuxcout.C
booby:~/c++> a.out
foo(&x): 100, x: 100
>How-To-Repeat:
#include <iostream>
int foo(int* changeme) { return (*changeme = 100); }
int main() {
int x=1111;
std::cout << "foo(&x): " << foo(&x) << ", x: " << x << std::endl;
}
// BTW: there was no complaint when I used an unqualified endl instead of std::endl;
>Fix:
Split the cout stmt above into two statements--one where x is evaluated and then one where x is printed:
std::cout << "foo(&x): " << foo(&x);
std::cout << ", x: " << x << std::endl;
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="linuxcout.e"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="linuxcout.e"
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: c++/9334: args to cout evaluated prematurely
@ 2003-01-15 21:46 bangerth
0 siblings, 0 replies; 2+ messages in thread
From: bangerth @ 2003-01-15 21:46 UTC (permalink / raw)
To: bala, gcc-bugs, gcc-prs, nobody
Synopsis: args to cout evaluated prematurely
State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Wed Jan 15 13:46:22 2003
State-Changed-Why:
That's how C++ works: the order of evaluation of statements
between sequence points is unspecified. So either the
value of "x" or of "foo(&x)" is pushed on the stack first.
Most any good C/C++ book will explain the matter.
W.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9334
^ permalink raw reply [flat|nested] 2+ messages in thread
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2003-01-15 21:46 bangerth
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