boost::lambda::select2nd

Hi! I would like to write code like int main() { namespace l = boost::lambda; std::map M; M[1] = 5.0; M[3] = 7.0; std::for_each(M.begin(), M.end(), l::select2nd(l::_1) *= 6.0); } Is it hard to implement this for boost::lambda? Markus