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109 lines
3.1 KiB
109 lines
3.1 KiB
/*============================================================================= |
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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/mpl/size.hpp> |
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#include <boost/mpl/if.hpp> |
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#include <boost/mpl/vector_c.hpp> |
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#include <boost/utility/result_of.hpp> |
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#include <boost/type_traits/remove_reference.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/category_of.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/view/transform_view.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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template <typename T> |
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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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}; |
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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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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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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 mpl::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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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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