Hi, The following meta program compiles, except for the last (commented) line. I expected it to work since it does so for the mpl::vector case. Any ideas what I am doing wrong here? #include #include #include #include #include #include #include #include using namespace boost; template struct insert_at { typedef typename mpl::advance::type itr; typedef typename mpl::insert::type type; }; typedef insert_at, mpl::int_<0>, int>::type vector1_int; BOOST_MPL_ASSERT(( mpl::equal)); //Doesn't compile with VC2008 // typedef insert_at, mpl::int_<0>, int>::type fusion_vector1_int; Code is using boost-trunk, rather recently updated. Thanks, Christian