view/reverse_view/reverse_view_iterator.hpp

0001 /*=============================================================================
0002     Copyright (c) 2001-2011 Joel de Guzman
0003
0004     Distributed under the Boost Software License, Version 1.0. (See accompanying
0005     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 ==============================================================================*/
0007 #if !defined(FUSION_REVERSE_VIEW_ITERATOR_07202005_0835)
0008 #define FUSION_REVERSE_VIEW_ITERATOR_07202005_0835
0009
0010 #include <boost/fusion/support/config.hpp>
0011 #include <boost/fusion/support/iterator_base.hpp>
0012 #include <boost/fusion/support/category_of.hpp>
0013 #include <boost/fusion/iterator/mpl/convert_iterator.hpp>
0014 #include <boost/fusion/adapted/mpl/mpl_iterator.hpp>
0015 #include <boost/fusion/view/reverse_view/detail/deref_impl.hpp>
0016 #include <boost/fusion/view/reverse_view/detail/next_impl.hpp>
0017 #include <boost/fusion/view/reverse_view/detail/prior_impl.hpp>
0018 #include <boost/fusion/view/reverse_view/detail/advance_impl.hpp>
0019 #include <boost/fusion/view/reverse_view/detail/distance_impl.hpp>
0020 #include <boost/fusion/view/reverse_view/detail/value_of_impl.hpp>
0021 #include <boost/fusion/view/reverse_view/detail/deref_data_impl.hpp>
0022 #include <boost/fusion/view/reverse_view/detail/value_of_data_impl.hpp>
0023 #include <boost/fusion/view/reverse_view/detail/key_of_impl.hpp>
0024 #include <boost/type_traits/is_base_of.hpp>
0025 #include <boost/static_assert.hpp>
0026
0027 #ifdef _MSC_VER
0028 #  pragma warning(push)
0029 #  pragma warning(disable: 4512) // assignment operator could not be generated.
0030 #endif
0031
0032 namespace boost { namespace fusion
0033 {
0034     struct reverse_view_iterator_tag;
0035
0036     template <typename First>
0037     struct reverse_view_iterator
0038         : iterator_base<reverse_view_iterator<First> >
0039     {
0040         typedef convert_iterator<First> converter;
0041         typedef typename converter::type first_type;
0042         typedef reverse_view_iterator_tag fusion_tag;
0043         typedef typename traits::category_of<first_type>::type category;
0044
0045         BOOST_STATIC_ASSERT((
0046             is_base_of<
0047                 bidirectional_traversal_tag
0048               , category>::value));
0049
0050         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0051         reverse_view_iterator(First const& in_first)
0052             : first(converter::call(in_first)) {}
0053
0054         first_type first;
0055     };
0056 }}
0057
0058 #ifdef _MSC_VER
0059 #  pragma warning(pop)
0060 #endif
0061
0062 #ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408
0063 namespace std
0064 {
0065     template <typename First>
0066     struct iterator_traits< ::boost::fusion::reverse_view_iterator<First> >
0067     { };
0068 }
0069 #endif
0070
0071 #endif
0072