set/detail/as_set.hpp

0001 /*=============================================================================
0002     Copyright (c) 2014-2015 Kohei Takahashi
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 #ifndef FUSION_AS_SET_11062014_2121
0008 #define FUSION_AS_SET_11062014_2121
0009
0010 #include <boost/fusion/support/config.hpp>
0011 #include <boost/fusion/container/set/set_fwd.hpp>
0012
0013 ///////////////////////////////////////////////////////////////////////////////
0014 // Without variadics, we will use the PP version
0015 ///////////////////////////////////////////////////////////////////////////////
0016 #if !defined(BOOST_FUSION_HAS_VARIADIC_SET)
0017 # include <boost/fusion/container/set/detail/cpp03/as_set.hpp>
0018 #else
0019
0020 ///////////////////////////////////////////////////////////////////////////////
0021 // C++11 interface
0022 ///////////////////////////////////////////////////////////////////////////////
0023 #include <boost/fusion/support/detail/index_sequence.hpp>
0024 #include <boost/fusion/container/set/set.hpp>
0025 #include <boost/fusion/iterator/value_of.hpp>
0026 #include <boost/fusion/iterator/deref.hpp>
0027 #include <boost/fusion/iterator/advance.hpp>
0028 #include <cstddef>
0029
0030 namespace boost { namespace fusion { namespace detail
0031 {
0032 BOOST_FUSION_BARRIER_BEGIN
0033
0034     template <int size
0035             , typename = typename detail::make_index_sequence<size>::type>
0036     struct as_set;
0037
0038     template <int size, std::size_t ...Indices>
0039     struct as_set<size, detail::index_sequence<Indices...> >
0040     {
0041         template <typename I>
0042         struct apply
0043         {
0044             typedef set<
0045                 typename result_of::value_of<
0046                     typename result_of::advance_c<I, Indices>::type
0047                 >::type...
0048             > type;
0049         };
0050
0051         template <typename Iterator>
0052         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0053         static typename apply<Iterator>::type
0054         call(Iterator const& i)
0055         {
0056             typedef apply<Iterator> gen;
0057             typedef typename gen::type result;
0058             return result(*advance_c<Indices>(i)...);
0059         }
0060     };
0061
0062 BOOST_FUSION_BARRIER_END
0063 }}}
0064
0065 #endif
0066 #endif
0067