forked from boostorg/fusion
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/*=============================================================================
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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/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)> : boost::add_reference<U> {};
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template <typename T>
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typename boost::result_of<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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};
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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 transform_view<Sequence, detail::addref> 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(as_vector(transform_view_type(val, detail::addref())))
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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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