title: Good library for bitsets or bitarrays
body: <p>Hallo all,
  I'm looking for some good library, that works with bitsets or bitarrays. Anybody knows something better (or not worse in all cases) then boost::dynamic_bitset? No matter if the library is open source or commercial.</p>
  
  <p>In my project it is a common task to store and work with large bit masks, that contain less number of ones. So they could be compressed well in memory.</p>