Mac Forum / Programming / CodeWarrior / December 2003

Hi,

I have this code:

 #include <iostream>
 #include <bitset>

 template< std::size_t N >
 void test()
 {
   std::cout << N << "bit:\n";
   std::bitset<N> bset; std::cout << bset << '\n';
   bset.set();          std::cout << bset << '\n';
   bset.reset();        std::cout << bset << '\n';
   bset.set();          std::cout << bset << "\n\n";
 }

 int main()
 {
   test<31>();
   test<32>();
   test<33>();
   return 0;
 }

Using VC7.1 (Dinkumware std lib) results in

 31bit:
 0000000000000000000000000000000
 1111111111111111111111111111111
 0000000000000000000000000000000
 1111111111111111111111111111111

 32bit:
 00000000000000000000000000000000
 11111111111111111111111111111111
 00000000000000000000000000000000
 11111111111111111111111111111111

 33bit:
 000000000000000000000000000000000
 111111111111111111111111111111111
 000000000000000000000000000000000
 111111111111111111111111111111111

which is just what I would have thought.
However, CW9.1 results in

 31bit:
 0000000000000000000000000000000
 1111111111111111111111111111111
 0000000000000000000000000000000
 1111111111111111111111111111111

 32bit:
 00000000000000000000000000000000
 00000000000000000000000000000000
 00000000000000000000000000000000
 00000000000000000000000000000000

 33bit:
 000000000000000000000000000000000
 111111111111111111111111111111111
 000000000000000000000000000000000
 111111111111111111111111111111111

I think this is a bug.

Schobi