[STDCXX-174] [MSVC/Win64] std::bitset::count() returns wrong value

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.1.3
• Fix Version/s: 4.2.0
• Component/s: 23. Containers

Environment

MSVC/Win64

• Assignee: Martin Sebor
• Reporter: Martin Sebor
• Created: 21/Apr/06 05:43
• Updated: 12/Jun/06 04:45
• Resolved: 12/Jun/06 04:45

Description

When compiled with MSVC on Win64 the program below aborts at runtime.

$ cat bitset.cpp && nmake bitset.exe

#include <bitset>
#include <cassert>

int main ()
{
std::bitset<1> b;
b = ~b;
assert (1 == b.count ());
}

Microsoft (R) Program Maintenance Utility Version 8.00.50727.42
Copyright (C) Microsoft Corporation. All rights reserved.

cl -D_RWCONFIG=12d -Ic:\build\sebor\stdlib-4.1.4\examples\stdlib\manual/../include -I.\..\..\..\../include -Ic:\build\sebor\stdlib-4.1.4/include -Ic:/build/sebor/stdlib-4.1.4/include/ansi -I.\..\..\..\.. -Ic:\build\sebor\stdlib-4.1.4 -Ic:\build\sebor\stdlib-4.1.4\examples\stdlib\manual -nologo -EHsc -MD -W3 -O2 -GR -c c:\build\sebor\stdlib-4.1.4\examples\stdlib\manual\bitset.cpp
bitset.cpp
link -nologo /NODEFAULTLIB:msvcprt /LIBPATH:.\..\..\..\..\lib /OUT:bitset.exe bitset.obj std12d.lib user32.lib

C:\build\sebor\stdlib-4.1.4-build\examples\stdlib\manual\12d>bitset.exe
Assertion failed: 1 == b.count (), file c:\build\sebor\stdlib-4.1.4\examples\stdlib\manual\bitset.cpp, line 8

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.