ceph/src/boost/libs/proto/include/boost/proto/transform/detail/fold_impl.hpp

   1 #if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
   2
   3     #include <boost/proto/transform/detail/preprocessed/fold_impl.hpp>
   4
   5 #elif !defined(BOOST_PP_IS_ITERATING)
   6
   7     #define BOOST_PROTO_CHILD_N_TYPE(N)                                                             \
   8         BOOST_PP_CAT(proto_child, N)                                                                \
   9         /**/
  10
  11     #define BOOST_PROTO_FOLD_STATE_TYPE(Z, N, DATA)                                                 \
  12         typedef                                                                                     \
  13             typename when<_, Fun>::template impl<                                                   \
  14                 typename result_of::child_c<Expr, N>::type                                          \
  15               , BOOST_PP_CAT(state, N)                                                              \
  16               , Data                                                                                \
  17             >::result_type                                                                          \
  18         BOOST_PP_CAT(state, BOOST_PP_INC(N));                                                       \
  19         /**/
  20
  21     #define BOOST_PROTO_FOLD_STATE(Z, N, DATA)                                                      \
  22         BOOST_PP_CAT(state, BOOST_PP_INC(N))                                                        \
  23         BOOST_PP_CAT(s, BOOST_PP_INC(N))                                                            \
  24           = typename when<_, Fun>::template impl<                                                   \
  25                 typename result_of::child_c<Expr, N>::type                                          \
  26               , BOOST_PP_CAT(state, N)                                                              \
  27               , Data                                                                                \
  28             >()(                                                                                    \
  29                 proto::child_c<N>(e)                                                                \
  30               , BOOST_PP_CAT(s, N)                                                                  \
  31               , d                                                                                   \
  32             );                                                                                      \
  33         /**/
  34
  35     #define BOOST_PROTO_REVERSE_FOLD_STATE_TYPE(Z, N, DATA)                                         \
  36         typedef                                                                                     \
  37             typename when<_, Fun>::template impl<                                                   \
  38                 typename result_of::child_c<                                                        \
  39                     Expr                                                                            \
  40                   , BOOST_PP_SUB(DATA, BOOST_PP_INC(N))                                             \
  41                 >::type                                                                             \
  42               , BOOST_PP_CAT(state, BOOST_PP_SUB(DATA, N))                                          \
  43               , Data                                                                                \
  44             >::result_type                                                                          \
  45         BOOST_PP_CAT(state, BOOST_PP_SUB(DATA, BOOST_PP_INC(N)));                                   \
  46         /**/
  47
  48     #define BOOST_PROTO_REVERSE_FOLD_STATE(Z, N, DATA)                                              \
  49         BOOST_PP_CAT(state, BOOST_PP_SUB(DATA, BOOST_PP_INC(N)))                                    \
  50         BOOST_PP_CAT(s, BOOST_PP_SUB(DATA, BOOST_PP_INC(N)))                                        \
  51           = typename when<_, Fun>::template impl<                                                   \
  52                 typename result_of::child_c<                                                        \
  53                     Expr                                                                            \
  54                   , BOOST_PP_SUB(DATA, BOOST_PP_INC(N))                                             \
  55                 >::type                                                                             \
  56               , BOOST_PP_CAT(state, BOOST_PP_SUB(DATA, N))                                          \
  57               , Data                                                                                \
  58             >()(                                                                                    \
  59                 proto::child_c<BOOST_PP_SUB(DATA, BOOST_PP_INC(N))>(e)                              \
  60               , BOOST_PP_CAT(s, BOOST_PP_SUB(DATA, N))                                              \
  61               , d                                                                                   \
  62             );                                                                                      \
  63         /**/
  64
  65     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
  66         #pragma wave option(preserve: 2, line: 0, output: "preprocessed/fold_impl.hpp")
  67     #endif
  68
  69     ///////////////////////////////////////////////////////////////////////////////
  70     /// \file fold_impl.hpp
  71     /// Contains definition of fold_impl<> and reverse_fold_impl<> templates.
  72     //
  73     //  Copyright 2008 Eric Niebler. Distributed under the Boost
  74     //  Software License, Version 1.0. (See accompanying file
  75     //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  76
  77     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
  78         #pragma wave option(preserve: 1)
  79     #endif
  80
  81     #define BOOST_PP_ITERATION_PARAMS_1                                                             \
  82         (3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/transform/detail/fold_impl.hpp>))
  83     #include BOOST_PP_ITERATE()
  84
  85     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
  86         #pragma wave option(output: null)
  87     #endif
  88
  89     #undef BOOST_PROTO_REVERSE_FOLD_STATE
  90     #undef BOOST_PROTO_REVERSE_FOLD_STATE_TYPE
  91     #undef BOOST_PROTO_FOLD_STATE
  92     #undef BOOST_PROTO_FOLD_STATE_TYPE
  93     #undef BOOST_PROTO_CHILD_N_TYPE
  94
  95 #else
  96
  97     #define N BOOST_PP_ITERATION()
  98
  99     template<typename State0, typename Fun, typename Expr, typename State, typename Data>
 100     struct fold_impl<State0, Fun, Expr, State, Data, N>
 101       : transform_impl<Expr, State, Data>
 102     {
 103         typedef typename when<_, State0>::template impl<Expr, State, Data>::result_type state0;
 104         BOOST_PP_REPEAT(N, BOOST_PROTO_FOLD_STATE_TYPE, N)
 105         typedef BOOST_PP_CAT(state, N) result_type;
 106
 107         result_type operator ()(
 108             typename fold_impl::expr_param e
 109           , typename fold_impl::state_param s
 110           , typename fold_impl::data_param d
 111         ) const
 112         {
 113             state0 s0 =
 114                 typename when<_, State0>::template impl<Expr, State, Data>()(e, s, d);
 115             BOOST_PP_REPEAT(N, BOOST_PROTO_FOLD_STATE, N)
 116             return BOOST_PP_CAT(s, N);
 117         }
 118     };
 119
 120     template<typename State0, typename Fun, typename Expr, typename State, typename Data>
 121     struct reverse_fold_impl<State0, Fun, Expr, State, Data, N>
 122       : transform_impl<Expr, State, Data>
 123     {
 124         typedef typename when<_, State0>::template impl<Expr, State, Data>::result_type BOOST_PP_CAT(state, N);
 125         BOOST_PP_REPEAT(N, BOOST_PROTO_REVERSE_FOLD_STATE_TYPE, N)
 126         typedef state0 result_type;
 127
 128         result_type operator ()(
 129             typename reverse_fold_impl::expr_param e
 130           , typename reverse_fold_impl::state_param s
 131           , typename reverse_fold_impl::data_param d
 132         ) const
 133         {
 134             BOOST_PP_CAT(state, N) BOOST_PP_CAT(s, N) =
 135                 typename when<_, State0>::template impl<Expr, State, Data>()(e, s, d);
 136             BOOST_PP_REPEAT(N, BOOST_PROTO_REVERSE_FOLD_STATE, N)
 137             return s0;
 138         }
 139     };
 140
 141     #undef N
 142
 143 #endif