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