I'm having trouple compiling multi_index_container<> with VC++7.1 I started from bidirectional_map example from the library (http://www.boost.org/libs/multi_index/doc/examples.html#example4), that compiles and works just fine. then i've added third tempate parameter CompareLessT to the bidirectional map: template<typename FromT, typename ToT, typename CompareLessT> struct bidir_map { typedef std::pair<std::string, std::string> value_type; typedef multi_index_container< value_type , indexed_by< ordered_unique< tag<from> , member<value_type, FromT, &value_type::first> , CompareLessT> , ordered_unique< tag<to> , member<value_type, ToT, &value_type::second> > , CompareLessT > > type; }; and it stops compiling giving me infamous INTERNAL COMPILER ERROR: e:\edatools\boost\1.32.0\boost\mpl\aux_\preprocessed\plain\apply_wrap.hpp(48) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line 2712) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information I might choose to ms's technical support, but had a bad feeling it wont do much good :).