boost/fusion/container/vector/detail/vector_n_chooser.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2006 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #ifndef BOOST_PP_IS_ITERATING
   8 #if !defined(FUSION_VECTOR_N_CHOOSER_07072005_1248)
   9 #define FUSION_VECTOR_N_CHOOSER_07072005_1248
  10
  11 #include <boost/fusion/container/vector/limits.hpp>
  12
  13 //  include vector0..N where N is FUSION_MAX_VECTOR_SIZE
  14 #include <boost/fusion/container/vector/vector10.hpp>
  15 #if (FUSION_MAX_VECTOR_SIZE > 10)
  16 #include <boost/fusion/container/vector/vector20.hpp>
  17 #endif
  18 #if (FUSION_MAX_VECTOR_SIZE > 20)
  19 #include <boost/fusion/container/vector/vector30.hpp>
  20 #endif
  21 #if (FUSION_MAX_VECTOR_SIZE > 30)
  22 #include <boost/fusion/container/vector/vector40.hpp>
  23 #endif
  24 #if (FUSION_MAX_VECTOR_SIZE > 40)
  25 #include <boost/fusion/container/vector/vector50.hpp>
  26 #endif
  27
  28 #include <boost/mpl/distance.hpp>
  29 #include <boost/mpl/find.hpp>
  30 #include <boost/mpl/begin_end.hpp>
  31 #include <boost/preprocessor/cat.hpp>
  32 #include <boost/preprocessor/repetition/enum_params.hpp>
  33
  34 namespace boost { namespace fusion
  35 {
  36     struct void_;
  37 }}
  38
  39 namespace boost { namespace fusion { namespace detail
  40 {
  41     template <int N>
  42     struct get_vector_n;
  43
  44     template <>
  45     struct get_vector_n<0>
  46     {
  47         template <BOOST_PP_ENUM_PARAMS(FUSION_MAX_VECTOR_SIZE, typename T)>
  48         struct call
  49         {
  50             typedef vector0 type;
  51         };
  52     };
  53
  54 #define BOOST_PP_FILENAME_1 \
  55     <boost/fusion/container/vector/detail/vector_n_chooser.hpp>
  56 #define BOOST_PP_ITERATION_LIMITS (1, FUSION_MAX_VECTOR_SIZE)
  57 #include BOOST_PP_ITERATE()
  58
  59     template <BOOST_PP_ENUM_PARAMS(FUSION_MAX_VECTOR_SIZE, typename T)>
  60     struct vector_n_chooser
  61     {
  62         typedef
  63             mpl::BOOST_PP_CAT(vector, FUSION_MAX_VECTOR_SIZE)
  64                 <BOOST_PP_ENUM_PARAMS(FUSION_MAX_VECTOR_SIZE, T)>
  65         input;
  66
  67         typedef typename mpl::begin<input>::type begin;
  68         typedef typename mpl::find<input, void_>::type end;
  69         typedef typename mpl::distance<begin, end>::type size;
  70
  71         typedef typename get_vector_n<size::value>::template
  72             call<BOOST_PP_ENUM_PARAMS(FUSION_MAX_VECTOR_SIZE, T)>::type
  73         type;
  74     };
  75 }}}
  76
  77 #endif
  78
  79 ///////////////////////////////////////////////////////////////////////////////
  80 //
  81 //  Preprocessor vertical repetition code
  82 //
  83 ///////////////////////////////////////////////////////////////////////////////
  84 #else // defined(BOOST_PP_IS_ITERATING)
  85
  86 #define N BOOST_PP_ITERATION()
  87
  88     template <>
  89     struct get_vector_n<N>
  90     {
  91         template <BOOST_PP_ENUM_PARAMS(FUSION_MAX_VECTOR_SIZE, typename T)>
  92         struct call
  93         {
  94             typedef BOOST_PP_CAT(vector, N)<BOOST_PP_ENUM_PARAMS(N, T)> type;
  95         };
  96     };
  97
  98 #undef N
  99 #endif // defined(BOOST_PP_IS_ITERATING)