How to use hash_setS in adjacent_list? If I define BOOST_HAS_HASH the compiler will generate "error C2977: 'stdext::hash_set' : too many template arguments". This is caused by using "BOOST_STD_EXTENSION_NAMESPACE::hash_set" in definition of "template struct container_traits< BOOST_STD_EXTENSION_NAMESPACE::hash_set > { typedef set_tag category; typedef stable_tag iterator_stability; // is this right? };" Class hash_set is defined in STL as follows: template >, class _Alloc = _STD allocator<_Kty> > class hash_set : public _Hash<_Hset_traits<_Kty, _Tr, _Alloc, false> > {...}; which has only 3 params. I'm using VS2008 Regards liquid