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libstdc++/9523: ios_base::sync_with_stdio clobbers standard streams
- From: peturr02 at ru dot is
- To: gcc-gnats at gcc dot gnu dot org
- Date: 31 Jan 2003 12:17:16 -0000
- Subject: libstdc++/9523: ios_base::sync_with_stdio clobbers standard streams
- Reply-to: peturr02 at ru dot is
>Number: 9523
>Category: libstdc++
>Synopsis: ios_base::sync_with_stdio clobbers standard streams
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Fri Jan 31 12:26:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: peturr02@ru.is
>Release: gcc-3.2.1
>Organization:
>Environment:
Red Hat Linux 8.0
>Description:
If any changes are made to the state of the standard stream objects (cin, cout etc.) before ios_base::sync_with_stdio is called, that state is lost as a result of the call.
>How-To-Repeat:
See attachment.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="syncwstdiobug.cc"
Content-Disposition: inline; filename="syncwstdiobug.cc"
#include <iostream>
#undef NDEBUG
#include <cassert>
int main()
{
using namespace std;
int index = ios_base::xalloc();
cin.iword(index) = 5;
cout.iword(index) = 5;
cerr.iword(index) = 5;
clog.iword(index) = 5;
wcin.iword(index) = 5;
wcout.iword(index) = 5;
wcerr.iword(index) = 5;
wclog.iword(index) = 5;
ios_base::sync_with_stdio(false);
assert(cin.iword(index) == 5);
assert(cout.iword(index) == 5);
assert(cerr.iword(index) == 5);
assert(clog.iword(index) == 5);
assert(wcin.iword(index) == 5);
assert(wcout.iword(index) == 5);
assert(wcerr.iword(index) == 5);
assert(wclog.iword(index) == 5);
return 0;
}