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From: "marc.glisse at normalesup dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/50268] New: [C++0x] bitset doesn't sanitize input
Date: Thu, 01 Sep 2011 19:20:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50268

             Bug #: 50268
           Summary: [C++0x] bitset doesn't sanitize input
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: marc.glisse@normalesup.org


#include <bitset>
#include <iostream>
int main(){
        std::bitset<1> b(3);
        std::cout << b.count() << std::endl;
}

Prints 1 with -std=c++98 and 2 with -std=c++0x.

(I noticed it while wondering why _M_are_all_aux uses popcount, which isn't
optimal)