Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2001-2011 Joel de Guzman
Chris@16: 
Chris@16:     Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16:     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: ==============================================================================*/
Chris@16: #if !defined(FUSION_JOINT_VIEW_07162005_0140)
Chris@16: #define FUSION_JOINT_VIEW_07162005_0140
Chris@16: 
Chris@101: #include <boost/fusion/support/config.hpp>
Chris@16: #include <boost/fusion/view/joint_view/joint_view_fwd.hpp>
Chris@16: #include <boost/fusion/support/detail/access.hpp>
Chris@16: #include <boost/fusion/support/is_view.hpp>
Chris@16: #include <boost/fusion/sequence/intrinsic/begin.hpp>
Chris@16: #include <boost/fusion/sequence/intrinsic/end.hpp>
Chris@16: #include <boost/fusion/sequence/intrinsic/size.hpp>
Chris@16: #include <boost/fusion/view/joint_view/joint_view_iterator.hpp>
Chris@16: #include <boost/fusion/view/joint_view/detail/begin_impl.hpp>
Chris@16: #include <boost/fusion/view/joint_view/detail/end_impl.hpp>
Chris@16: #include <boost/fusion/support/sequence_base.hpp>
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: #include <boost/mpl/plus.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/mpl/eval_if.hpp>
Chris@16: #include <boost/mpl/inherit.hpp>
Chris@16: #include <boost/mpl/identity.hpp>
Chris@16: 
Chris@16: namespace boost { namespace fusion
Chris@16: {
Chris@16:     struct joint_view_tag;
Chris@16:     struct forward_traversal_tag;
Chris@16:     struct fusion_sequence_tag;
Chris@16: 
Chris@16:     template <typename Sequence1, typename Sequence2>
Chris@16:     struct joint_view : sequence_base<joint_view<Sequence1, Sequence2> >
Chris@16:     {
Chris@16:         typedef joint_view_tag fusion_tag;
Chris@16:         typedef fusion_sequence_tag tag; // this gets picked up by MPL
Chris@16:         typedef typename
Chris@16:             mpl::eval_if<
Chris@16:                 mpl::and_<
Chris@16:                     traits::is_associative<Sequence1>
Chris@16:                   , traits::is_associative<Sequence2>
Chris@16:                 >
Chris@16:               , mpl::inherit2<forward_traversal_tag,associative_tag>
Chris@16:               , mpl::identity<forward_traversal_tag>
Chris@16:             >::type
Chris@16:         category;
Chris@16:         typedef mpl::true_ is_view;
Chris@16: 
Chris@16:         typedef typename result_of::begin<Sequence1>::type first_type;
Chris@16:         typedef typename result_of::end<Sequence1>::type last_type;
Chris@16:         typedef typename result_of::begin<Sequence2>::type concat_type;
Chris@16:         typedef typename result_of::end<Sequence2>::type concat_last_type;
Chris@16:         typedef typename mpl::int_<
Chris@16:             result_of::size<Sequence1>::value + result_of::size<Sequence2>::value>
Chris@16:         size;
Chris@16: 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         joint_view(Sequence1& in_seq1, Sequence2& in_seq2)
Chris@16:             : seq1(in_seq1)
Chris@16:             , seq2(in_seq2)
Chris@16:         {}
Chris@16: 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         first_type first() const { return fusion::begin(seq1); }
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         concat_type concat() const { return fusion::begin(seq2); }
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         concat_last_type concat_last() const { return fusion::end(seq2); }
Chris@16: 
Chris@16:     private:
Chris@16:         // silence MSVC warning C4512: assignment operator could not be generated
Chris@16:         joint_view& operator= (joint_view const&);
Chris@16: 
Chris@16:         typename mpl::if_<traits::is_view<Sequence1>, Sequence1, Sequence1&>::type seq1;
Chris@16:         typename mpl::if_<traits::is_view<Sequence2>, Sequence2, Sequence2&>::type seq2;
Chris@16:     };
Chris@16: }}
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: