The first thing that C++ users will notice is that C++ headers have a ".hh" suffix or a ``.hxx'' suffix to distinguish them from C's ".h" suffix. Pre Babel 0.11, the ``.hh'' suffix was used for all C++ bindings. For Babel 0.11 and after, the ``.hh'' suffix was exclusively for the DCxx binding, and ``.hxx'' was introduced for the UCxx binding.