Hi, getting lambda work with multi_index seems a bit tough for me.... the following compiles fine with MSVC++ 2003, but not when I #include sequenced_index.hpp or ordered_index.hpp. The error message says: error C2872: '_1' : ambiguous symbol could be 'c:\Boost\include\boost-1_33_1\boost\lambda\core.hpp(69) : const boost::lambda::placeholder1_type &boost::lambda::`anonymous-namespace'::_1' or 'c:\Boost\include\boost-1_33_1\boost\bind\placeholders.hpp(42) : boost::arg<I> `anonymous-namespace'::_1' with [ I=1 ] This can of course be fixed by using boost::lambda::_1, but I doubt that it is the expected behavior. Can anyone please explain what I'm doing wrong? Thanks, Filip #include <boost/config.hpp> #include <boost/lambda/lambda.hpp> #include <boost/multi_index_container.hpp> #include <boost/multi_index/member.hpp> #include <boost/multi_index/hashed_index.hpp> //#include <boost/multi_index/sequenced_index.hpp> //#include <boost/multi_index/ordered_index.hpp> #include <list> using namespace boost; using namespace boost::lambda; int main(int argc, char* argv[]) { std::list<int> v(10); for_each(v.begin(), v.end(), _1 = 1); return 0; }