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