I am using MSVC 6 with Boost 1-32. Below is my sample code using two indeices: struct by_id{}; struct by_symbol{}; struct StringIdPair { StringIdPair(int _id, const std::string & _string): id(_id), string(_string) {} int id; std::string string; }; typedef multi_index_container< StringIdPair, indexed_by< ordered_unique, BOOST_MULTI_INDEX_MEMBER(StringIdPair, int, id) >, ordered_unique, BOOST_MULTI_INDEX_MEMBER(StringIdPair, std::string, string) > > > StringIdTable; StringIdTable string_id_table; When I compile it, I have following errors. The actual message is much longer than this. I don't want paste them here to piss off every one on this mailing list. :) Anyway, I am not a template expert. I couldn't figure it out myself. Any help will be appreciated. Thanks. c:\boost\include\boost_1_32\boost\multi_index\detail\msvc_index_specifier.hpp(45) : error C2039: 'node_class' : is not a member of 'fake_index_type<0>' c:\boost\include\boost_1_32\boost\multi_index\detail\node_type.hpp(42) : see reference to class template instantiation 'boost::multi_index::detail::msvc_index_specifier,struct boost::multi_index::member_offset,4>,struct boost::multi_index::detail: :null_arg> >::result_node_class' being compiled c:\boost\include\boost_1_32\boost\mpl\aux_\preprocessed\msvc60\apply_wrap.hpp(102) : see reference to class template instantiation 'boost::multi_index::detail::index_node_applier::apply,struct boost::multi_index::member_offset,struct boost::multi_index::detail::null_arg>,struct boost::multi_index::ordered_unique,struct boost::multi_index::member_offset,4>,struct boost::multi_index::detail::null_arg> >,1>,struct boost::multi_index::detail::index_node_base<struct StringIdPair> >' being compiled