 {     template<           typename First         , typename Last         , typename State         , typename BackwardOp         , typename ForwardOp         >     struct result_     {         typedef First iter0;         typedef State fwd_state0;         typedef typename apply0< ForwardOp, fwd_state0, typename deref<iter0>::type >::type fwd_state0;         typedef typename mpl::next<iter0>::type iter0;         typedef typename apply0< ForwardOp, fwd_state0, typename deref<iter0>::type >::type fwd_state0;         typedef typename mpl::next<iter0>::type iter0;         typedef typename apply0< ForwardOp, fwd_state0, typename deref<iter0>::type >::type fwd_state0;         typedef typename mpl::next<iter0>::type iter0;         typedef typename apply0< ForwardOp, fwd_state0, typename deref<iter0>::type >::type fwd_state0;         typedef typename mpl::next<iter0>::type iter0;                   typedef 