ceph/src/boost/boost/proto/transform/detail/call.hpp

   1 #if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
   2
   3     #include <boost/proto/transform/detail/preprocessed/call.hpp>
   4
   5 #elif !defined(BOOST_PP_IS_ITERATING)
   6
   7     #define BOOST_PROTO_NTH_RESULT_TYPE(Z, M, DATA)                                                 \
   8         typedef                                                                                     \
   9             typename when<_, BOOST_PP_CAT(A, M)>::template impl<Expr, State, Data>                  \
  10         BOOST_PP_CAT(a, M);                                                                         \
  11         typedef typename BOOST_PP_CAT(a, M)::result_type BOOST_PP_CAT(b, M);                        \
  12         /**/
  13
  14     #define BOOST_PROTO_NTH_RESULT(Z, M, DATA)                                                      \
  15         detail::as_lvalue(BOOST_PP_CAT(a, M)()(e, s, d))                                            \
  16         /**/
  17
  18     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
  19         #pragma wave option(preserve: 2, line: 0, output: "preprocessed/call.hpp")
  20     #endif
  21
  22     ///////////////////////////////////////////////////////////////////////////////
  23     /// \file call.hpp
  24     /// Contains definition of the call<> transform.
  25     //
  26     //  Copyright 2008 Eric Niebler. Distributed under the Boost
  27     //  Software License, Version 1.0. (See accompanying file
  28     //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  29
  30     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
  31         #pragma wave option(preserve: 1)
  32     #endif
  33
  34     #define BOOST_PP_ITERATION_PARAMS_1                                                             \
  35         (3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/transform/detail/call.hpp>))
  36     #include BOOST_PP_ITERATE()
  37
  38     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
  39         #pragma wave option(output: null)
  40     #endif
  41
  42     #undef BOOST_PROTO_NTH_RESULT
  43     #undef BOOST_PROTO_NTH_RESULT_TYPE
  44
  45 #else
  46
  47     #define N BOOST_PP_ITERATION()
  48
  49     #if N > 3
  50     /// \brief Call the PolymorphicFunctionObject \c Fun with the
  51     /// current expression, state and data, transformed according
  52     /// to \c A0 through \c AN.
  53     template<typename Fun BOOST_PP_ENUM_TRAILING_PARAMS(N, typename A)>
  54     struct call<Fun(BOOST_PP_ENUM_PARAMS(N, A))> : transform<call<Fun(BOOST_PP_ENUM_PARAMS(N, A))> >
  55     {
  56         template<typename Expr, typename State, typename Data>
  57         struct impl : transform_impl<Expr, State, Data>
  58         {
  59             BOOST_PP_REPEAT(N, BOOST_PROTO_NTH_RESULT_TYPE, ~)
  60
  61             typedef detail::poly_function_traits<Fun, Fun(BOOST_PP_ENUM_PARAMS(N, b))> function_traits;
  62             typedef typename function_traits::result_type result_type;
  63
  64             /// Let \c ax be <tt>when\<_, Ax\>()(e, s, d)</tt>
  65             /// for each \c x in <tt>[0,N]</tt>.
  66             /// Return <tt>Fun()(a0, a1,... aN)</tt>.
  67             ///
  68             /// \param e The current expression
  69             /// \param s The current state
  70             /// \param d An arbitrary data
  71             BOOST_FORCEINLINE
  72             result_type operator ()(
  73                 typename impl::expr_param   e
  74               , typename impl::state_param  s
  75               , typename impl::data_param   d
  76             ) const
  77             {
  78                 typedef typename function_traits::function_type function_type;
  79                 return function_type()(BOOST_PP_ENUM(N, BOOST_PROTO_NTH_RESULT, ~));
  80             }
  81         };
  82     };
  83     #endif
  84
  85     #if N > 0
  86     /// \brief Call the PolymorphicFunctionObject \c Fun with the
  87     /// current expression, state and data, transformed according
  88     /// to \c A0 through \c AN.
  89     template<typename Fun BOOST_PP_ENUM_TRAILING_PARAMS(N, typename A)>
  90     struct call<Fun(BOOST_PP_ENUM_PARAMS(N, A)...)> : transform<call<Fun(BOOST_PP_ENUM_PARAMS(N, A)...)> >
  91     {
  92         template<typename Expr, typename State, typename Data>
  93         struct impl
  94           : call<
  95                 typename detail::expand_pattern<
  96                     proto::arity_of<Expr>::value // BUGBUG this isn't right. Could be pack(_child), should use arity of child!
  97                   , BOOST_PP_CAT(A, BOOST_PP_DEC(N))
  98                   , detail::BOOST_PP_CAT(expand_pattern_rest_, BOOST_PP_DEC(N))<
  99                         Fun
 100                         BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_DEC(N), A)
 101                     >
 102                 >::type
 103             >::template impl<Expr, State, Data>
 104         {};
 105     };
 106     #endif
 107
 108     #undef N
 109
 110 #endif