Index: concept_archetype.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/concept_archetype.hpp,v
retrieving revision 1.29
diff -r1.29 concept_archetype.hpp
21a22,32
> #if defined(__HP_aCC) && BOOST_WORKAROUND(_RWSTD_VER, == 0x02020100)
> namespace std {
> struct __unknown_iterator_tag {};
> template <class _TypeT>
> inline __unknown_iterator_tag __iterator_category (const _TypeT&)
> {
>     return __unknown_iterator_tag ();
> }
> } // namespace std
> #endif
>