| #if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES) |
| |
| #include <boost/proto/transform/detail/preprocessed/fold_impl.hpp> |
| |
| #elif !defined(BOOST_PP_IS_ITERATING) |
| |
| #define BOOST_PROTO_CHILD_N_TYPE(N) \ |
| BOOST_PP_CAT(proto_child, N) \ |
| /**/ |
| |
| #define BOOST_PROTO_FOLD_STATE_TYPE(Z, N, DATA) \ |
| typedef \ |
| typename when<_, Fun>::template impl< \ |
| typename result_of::child_c<Expr, N>::type \ |
| , BOOST_PP_CAT(state, N) \ |
| , Data \ |
| >::result_type \ |
| BOOST_PP_CAT(state, BOOST_PP_INC(N)); \ |
| /**/ |
| |
| #define BOOST_PROTO_FOLD_STATE(Z, N, DATA) \ |
| BOOST_PP_CAT(state, BOOST_PP_INC(N)) \ |
| BOOST_PP_CAT(s, BOOST_PP_INC(N)) \ |
| = typename when<_, Fun>::template impl< \ |
| typename result_of::child_c<Expr, N>::type \ |
| , BOOST_PP_CAT(state, N) \ |
| , Data \ |
| >()( \ |
| proto::child_c<N>(e) \ |
| , BOOST_PP_CAT(s, N) \ |
| , d \ |
| ); \ |
| /**/ |
| |
| #define BOOST_PROTO_REVERSE_FOLD_STATE_TYPE(Z, N, DATA) \ |
| typedef \ |
| typename when<_, Fun>::template impl< \ |
| typename result_of::child_c< \ |
| Expr \ |
| , BOOST_PP_SUB(DATA, BOOST_PP_INC(N)) \ |
| >::type \ |
| , BOOST_PP_CAT(state, BOOST_PP_SUB(DATA, N)) \ |
| , Data \ |
| >::result_type \ |
| BOOST_PP_CAT(state, BOOST_PP_SUB(DATA, BOOST_PP_INC(N))); \ |
| /**/ |
| |
| #define BOOST_PROTO_REVERSE_FOLD_STATE(Z, N, DATA) \ |
| BOOST_PP_CAT(state, BOOST_PP_SUB(DATA, BOOST_PP_INC(N))) \ |
| BOOST_PP_CAT(s, BOOST_PP_SUB(DATA, BOOST_PP_INC(N))) \ |
| = typename when<_, Fun>::template impl< \ |
| typename result_of::child_c< \ |
| Expr \ |
| , BOOST_PP_SUB(DATA, BOOST_PP_INC(N)) \ |
| >::type \ |
| , BOOST_PP_CAT(state, BOOST_PP_SUB(DATA, N)) \ |
| , Data \ |
| >()( \ |
| proto::child_c<BOOST_PP_SUB(DATA, BOOST_PP_INC(N))>(e) \ |
| , BOOST_PP_CAT(s, BOOST_PP_SUB(DATA, N)) \ |
| , d \ |
| ); \ |
| /**/ |
| |
| #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES) |
| #pragma wave option(preserve: 2, line: 0, output: "preprocessed/fold_impl.hpp") |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /// \file fold_impl.hpp |
| /// Contains definition of fold_impl<> and reverse_fold_impl<> templates. |
| // |
| // Copyright 2008 Eric Niebler. Distributed under the Boost |
| // Software License, Version 1.0. (See accompanying file |
| // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| |
| #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES) |
| #pragma wave option(preserve: 1) |
| #endif |
| |
| #define BOOST_PP_ITERATION_PARAMS_1 \ |
| (3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/transform/detail/fold_impl.hpp>)) |
| #include BOOST_PP_ITERATE() |
| |
| #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES) |
| #pragma wave option(output: null) |
| #endif |
| |
| #undef BOOST_PROTO_REVERSE_FOLD_STATE |
| #undef BOOST_PROTO_REVERSE_FOLD_STATE_TYPE |
| #undef BOOST_PROTO_FOLD_STATE |
| #undef BOOST_PROTO_FOLD_STATE_TYPE |
| #undef BOOST_PROTO_CHILD_N_TYPE |
| |
| #else |
| |
| #define N BOOST_PP_ITERATION() |
| |
| template<typename State0, typename Fun, typename Expr, typename State, typename Data> |
| struct fold_impl<State0, Fun, Expr, State, Data, N> |
| : transform_impl<Expr, State, Data> |
| { |
| typedef typename when<_, State0>::template impl<Expr, State, Data>::result_type state0; |
| BOOST_PP_REPEAT(N, BOOST_PROTO_FOLD_STATE_TYPE, N) |
| typedef BOOST_PP_CAT(state, N) result_type; |
| |
| result_type operator ()( |
| typename fold_impl::expr_param e |
| , typename fold_impl::state_param s |
| , typename fold_impl::data_param d |
| ) const |
| { |
| state0 s0 = |
| typename when<_, State0>::template impl<Expr, State, Data>()(e, s, d); |
| BOOST_PP_REPEAT(N, BOOST_PROTO_FOLD_STATE, N) |
| return BOOST_PP_CAT(s, N); |
| } |
| }; |
| |
| template<typename State0, typename Fun, typename Expr, typename State, typename Data> |
| struct reverse_fold_impl<State0, Fun, Expr, State, Data, N> |
| : transform_impl<Expr, State, Data> |
| { |
| typedef typename when<_, State0>::template impl<Expr, State, Data>::result_type BOOST_PP_CAT(state, N); |
| BOOST_PP_REPEAT(N, BOOST_PROTO_REVERSE_FOLD_STATE_TYPE, N) |
| typedef state0 result_type; |
| |
| result_type operator ()( |
| typename reverse_fold_impl::expr_param e |
| , typename reverse_fold_impl::state_param s |
| , typename reverse_fold_impl::data_param d |
| ) const |
| { |
| BOOST_PP_CAT(state, N) BOOST_PP_CAT(s, N) = |
| typename when<_, State0>::template impl<Expr, State, Data>()(e, s, d); |
| BOOST_PP_REPEAT(N, BOOST_PROTO_REVERSE_FOLD_STATE, N) |
| return s0; |
| } |
| }; |
| |
| #undef N |
| |
| #endif |
