Hello Joaquín, Hello Pavel, thank you for your responses.
typedef composite_key<Element_t,...> SBothKeyExtractor_t; typedef multi_index_container<Element_t, indexed_by< ordered_non_unique<tag<SFirst>,...> ordered_non_unique<tag<SSecond>,...> ordered_unique<tag<SBoth>, SBothKeyExtractor_t>
MultiIndex_t;
The typedef SBothKeyExtractor_t causes an internal compiler error of the Visual C++ 7.1 Compiler, too. d:\Libraries\DLLs\Boost\Boost_1_32_0\inc\boost\tuple\detail\tuple_basic.hpp(612): fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line 2701) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information
if this still doesn't work, try then
struct SBothKeyExtractor_t: public composite_key<Element_t,...> { };
// as before
The declaration of the struct fixes the problem. Now, I'm able to build the example without an error. Thanks a lot. For completeness. Below is the whole source code of my initial example, which causes the internal compiler error: #include <string> #include <boost/multi_index_container.hpp> #include <boost/multi_index/member.hpp> #include <boost/multi_index/ordered_index.hpp> #include <boost/multi_index/sequenced_index.hpp> #include <boost/multi_index/key_extractors.hpp> using boost::multi_index_container; using namespace boost::multi_index; struct SSequence { }; struct SFirst { }; struct SSecond { }; struct SBoth { }; typedef std::pair<std::wstring, std::wstring> Element_t; typedef multi_index_container<Element_t, indexed_by<ordered_non_unique<tag<SFirst>, member<Element_t, std::wstring, &Element_t::first> >, ordered_non_unique<tag<SSecond>, member<Element_t, std::wstring, &Element_t::second> >, ordered_unique<tag<SBoth>, composite_key<Element_t, member<Element_t, std::wstring, &Element_t::first>, member<Element_t, std::wstring, &Element_t::second> > > > > MultiIndex_t; int main(int argc, char** argv) { using namespace std; using namespace boost; MultiIndex_t test; MultiIndex_t::index<SBoth>::type& both = test.get<SBoth>(); return 0; } Regards, Jochen.