123 lines
3.6 KiB
C++
123 lines
3.6 KiB
C++
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/*=============================================================================
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Copyright (c) 2009 Hartmut Kaiser
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_FUSION_NVIEW_SEP_23_2009_0948PM)
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#define BOOST_FUSION_NVIEW_SEP_23_2009_0948PM
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#include <boost/fusion/support/config.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/type_traits/add_const.hpp>
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#include <boost/fusion/support/is_view.hpp>
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#include <boost/fusion/support/sequence_base.hpp>
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#include <boost/fusion/container/vector.hpp>
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#include <boost/fusion/sequence/intrinsic/size.hpp>
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#include <boost/fusion/view/transform_view.hpp>
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#include <boost/config.hpp>
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namespace boost { namespace fusion
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{
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namespace detail
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{
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struct addref
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{
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template<typename Sig>
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struct result;
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template<typename U>
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struct result<addref(U)> : add_reference<U> {};
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#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
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template <typename T>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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typename add_reference<T>::type
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operator()(T& x) const
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{
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return x;
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}
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#else
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template <typename T>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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typename result<addref(T)>::type
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operator()(T&& x) const
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{
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return x;
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}
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#endif
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};
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struct addconstref
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{
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template<typename Sig>
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struct result;
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template<typename U>
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struct result<addconstref(U)>
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: add_reference<typename add_const<U>::type>
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{};
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template <typename T>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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typename add_reference<typename add_const<T>::type>::type
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operator()(T& x) const
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{
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return x;
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}
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template <typename T>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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typename add_reference<typename add_const<T>::type>::type
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operator()(T const& x) const
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{
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return x;
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}
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};
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}
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struct nview_tag;
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struct random_access_traversal_tag;
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struct fusion_sequence_tag;
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template<typename Sequence, typename Indicies>
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struct nview
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: sequence_base<nview<Sequence, Indicies> >
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{
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typedef nview_tag fusion_tag;
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typedef fusion_sequence_tag tag; // this gets picked up by MPL
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typedef random_access_traversal_tag category;
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typedef mpl::true_ is_view;
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typedef Indicies index_type;
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typedef typename result_of::size<Indicies>::type size;
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typedef typename mpl::if_<
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is_const<Sequence>, detail::addconstref, detail::addref
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>::type transform_type;
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typedef transform_view<Sequence, transform_type> transform_view_type;
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typedef typename result_of::as_vector<transform_view_type>::type
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sequence_type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit nview(Sequence& val)
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: seq(sequence_type(transform_view_type(val, transform_type())))
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{}
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sequence_type seq;
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};
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}}
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// define the nview() generator functions
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#include <boost/fusion/view/nview/detail/nview_impl.hpp>
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#endif
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