detail/cpp03/nview_impl.hpp

0001 /*=============================================================================
0002     Copyright (c) 2009 Hartmut Kaiser
0003
0004     Distributed under the Boost Software License, Version 1.0. (See accompanying
0005     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 ==============================================================================*/
0007
0008 #ifndef BOOST_PP_IS_ITERATING
0009
0010 #if !defined(BOOST_FUSION_NVIEW_IMPL_SEP_23_2009_1017PM)
0011 #define BOOST_FUSION_NVIEW_IMPL_SEP_23_2009_1017PM
0012
0013 #include <climits>
0014 #include <boost/preprocessor/cat.hpp>
0015 #include <boost/preprocessor/repeat.hpp>
0016 #include <boost/preprocessor/iterate.hpp>
0017 #include <boost/preprocessor/repetition/enum_params.hpp>
0018 #include <boost/preprocessor/repetition/enum_binary_params.hpp>
0019 #include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
0020 #include <boost/mpl/vector_c.hpp>
0021 #include <boost/fusion/adapted/mpl.hpp>
0022 #include <boost/fusion/adapted/mpl/mpl_iterator.hpp>
0023
0024 #define BOOST_PP_ITERATION_PARAMS_1                                           \
0025     (3, (1, FUSION_MAX_VECTOR_SIZE,                                           \
0026     "boost/fusion/view/nview/detail/cpp03/nview_impl.hpp"))                   \
0027     /**/
0028
0029 ///////////////////////////////////////////////////////////////////////////////
0030 namespace boost { namespace fusion { namespace result_of
0031 {
0032     template <typename Sequence
0033       , BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(FUSION_MAX_VECTOR_SIZE, int I, INT_MAX)>
0034     struct as_nview
0035     {
0036         typedef mpl::vector_c<
0037             int, BOOST_PP_ENUM_PARAMS(FUSION_MAX_VECTOR_SIZE, I)
0038         > index_type;
0039         typedef nview<Sequence, index_type> type;
0040     };
0041 }}}
0042
0043 #include BOOST_PP_ITERATE()
0044
0045 #endif
0046
0047 ///////////////////////////////////////////////////////////////////////////////
0048 //  Preprocessor vertical repetition code
0049 ///////////////////////////////////////////////////////////////////////////////
0050 #else // defined(BOOST_PP_IS_ITERATING)
0051
0052 #define N BOOST_PP_ITERATION()
0053
0054 #if N < FUSION_MAX_VECTOR_SIZE
0055 namespace boost { namespace fusion { namespace result_of
0056 {
0057     template <typename Sequence, BOOST_PP_ENUM_PARAMS(N, int I)>
0058     struct as_nview<Sequence, BOOST_PP_ENUM_PARAMS(N, I)>
0059     {
0060         typedef mpl::vector_c<int, BOOST_PP_ENUM_PARAMS(N, I)> index_type;
0061         typedef nview<Sequence, index_type> type;
0062     };
0063 }}}
0064 #endif
0065
0066 namespace boost { namespace fusion
0067 {
0068     template<BOOST_PP_ENUM_PARAMS(N, int I), typename Sequence>
0069     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0070     inline nview<Sequence, mpl::vector_c<int, BOOST_PP_ENUM_PARAMS(N, I)> >
0071     as_nview(Sequence& s)
0072     {
0073         typedef mpl::vector_c<int, BOOST_PP_ENUM_PARAMS(N, I)> index_type;
0074         return nview<Sequence, index_type>(s);
0075     }
0076
0077 }}
0078
0079 #undef N
0080
0081 #endif