Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2009 Hartmut Kaiser
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: 
Chris@16: #if !defined(BOOST_FUSION_NVIEW_SEP_23_2009_0948PM)
Chris@16: #define BOOST_FUSION_NVIEW_SEP_23_2009_0948PM
Chris@16: 
Chris@101: #include <boost/fusion/support/config.hpp>
Chris@16: #include <boost/mpl/size.hpp>
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: #include <boost/mpl/vector_c.hpp>
Chris@16: #include <boost/utility/result_of.hpp>
Chris@16: 
Chris@16: #include <boost/type_traits/remove_reference.hpp>
Chris@16: #include <boost/type_traits/add_reference.hpp>
Chris@16: #include <boost/type_traits/add_const.hpp>
Chris@16: 
Chris@16: #include <boost/fusion/support/is_view.hpp>
Chris@16: #include <boost/fusion/support/category_of.hpp>
Chris@16: #include <boost/fusion/support/sequence_base.hpp>
Chris@16: #include <boost/fusion/container/vector.hpp>
Chris@16: #include <boost/fusion/view/transform_view.hpp>
Chris@16: 
Chris@16: #include <boost/config.hpp>
Chris@16: 
Chris@16: namespace boost { namespace fusion
Chris@16: {
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         struct addref
Chris@16:         {
Chris@16:             template<typename Sig>
Chris@16:             struct result;
Chris@16: 
Chris@16:             template<typename U>
Chris@16:             struct result<addref(U)> : add_reference<U> {};
Chris@16: 
Chris@16: #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
Chris@16:             template <typename T>
Chris@101:             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:             typename add_reference<T>::type 
Chris@16:             operator()(T& x) const
Chris@16:             {
Chris@16:                 return x;
Chris@16:             }
Chris@16: #else
Chris@16:             template <typename T>
Chris@101:             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:             typename result<addref(T)>::type
Chris@16:             operator()(T&& x) const
Chris@16:             {
Chris@16:                 return x;
Chris@16:             }
Chris@16: #endif
Chris@16:         };
Chris@16: 
Chris@16:         struct addconstref
Chris@16:         {
Chris@16:             template<typename Sig>
Chris@16:             struct result;
Chris@16: 
Chris@16:             template<typename U>
Chris@16:             struct result<addconstref(U)> 
Chris@16:               : add_reference<typename add_const<U>::type> 
Chris@16:             {};
Chris@16: 
Chris@16:             template <typename T>
Chris@101:             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:             typename add_reference<typename add_const<T>::type>::type 
Chris@16:             operator()(T& x) const
Chris@16:             {
Chris@16:                 return x;
Chris@16:             }
Chris@16: 
Chris@16:             template <typename T>
Chris@101:             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:             typename add_reference<typename add_const<T>::type>::type 
Chris@16:             operator()(T const& x) const
Chris@16:             {
Chris@16:                 return x;
Chris@16:             }
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     struct nview_tag;
Chris@16:     struct random_access_traversal_tag;
Chris@16:     struct fusion_sequence_tag;
Chris@16: 
Chris@16:     template<typename Sequence, typename Indicies>
Chris@16:     struct nview
Chris@16:       : sequence_base<nview<Sequence, Indicies> >
Chris@16:     {
Chris@16:         typedef nview_tag fusion_tag;
Chris@16:         typedef fusion_sequence_tag tag; // this gets picked up by MPL
Chris@16:         typedef random_access_traversal_tag category;
Chris@16: 
Chris@16:         typedef mpl::true_ is_view;
Chris@16:         typedef Indicies index_type;
Chris@16:         typedef typename mpl::size<Indicies>::type size;
Chris@16: 
Chris@16:         typedef typename mpl::if_<
Chris@16:             is_const<Sequence>, detail::addconstref, detail::addref
Chris@16:         >::type transform_type;
Chris@16:         typedef transform_view<Sequence, transform_type> transform_view_type;
Chris@16:         typedef typename result_of::as_vector<transform_view_type>::type 
Chris@16:             sequence_type;
Chris@16: 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         explicit nview(Sequence& val)
Chris@16:           : seq(sequence_type(transform_view_type(val, transform_type()))) 
Chris@16:         {}
Chris@16: 
Chris@16:         sequence_type seq;
Chris@16:     };
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: // define the nview() generator functions
Chris@16: #include <boost/fusion/view/nview/detail/nview_impl.hpp>
Chris@16: 
Chris@16: #endif
Chris@16: 
Chris@16: