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81 lines
2.5 KiB
81 lines
2.5 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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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(FUSION_FUSION_ITERATOR_10012005_1551)
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#define FUSION_FUSION_ITERATOR_10012005_1551
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/iterator/value_of.hpp>
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#include <boost/fusion/iterator/next.hpp>
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#include <boost/fusion/iterator/prior.hpp>
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#include <boost/fusion/iterator/advance.hpp>
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#include <boost/fusion/iterator/distance.hpp>
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#include <boost/fusion/support/category_of.hpp>
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#include <boost/mpl/next_prior.hpp>
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#include <boost/mpl/advance_fwd.hpp>
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#include <boost/mpl/distance_fwd.hpp>
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#include <boost/mpl/iterator_tags.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/type_traits/is_base_of.hpp>
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namespace boost { namespace fusion { namespace detail
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{
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template<class Category>
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struct to_mpl_category {
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typedef typename mpl::eval_if<
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is_base_of<random_access_traversal_tag, Category>,
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mpl::random_access_iterator_tag,
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mpl::eval_if<
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is_base_of<bidirectional_traversal_tag, Category>,
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mpl::bidirectional_iterator_tag,
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mpl::forward_iterator_tag
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>
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>::type type;
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};
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}}}
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namespace boost { namespace mpl
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{
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template <typename Iterator>
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struct fusion_iterator
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{
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typedef typename fusion::result_of::value_of<Iterator>::type type;
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typedef typename fusion::traits::category_of<Iterator>::type fusion_category;
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typedef typename fusion::detail::to_mpl_category<fusion_category>::type category;
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typedef Iterator iterator;
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};
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template <typename Iterator>
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struct next<fusion_iterator<Iterator> >
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{
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typedef fusion_iterator<typename fusion::result_of::next<Iterator>::type> type;
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};
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template <typename Iterator>
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struct prior<fusion_iterator<Iterator> >
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{
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typedef fusion_iterator<typename fusion::result_of::prior<Iterator>::type> type;
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};
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template <typename Iterator, typename N>
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struct advance<fusion_iterator<Iterator>, N>
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{
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typedef fusion_iterator<typename fusion::result_of::advance<Iterator, N>::type> type;
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};
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template <typename First, typename Last>
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struct distance<fusion_iterator<First>, fusion_iterator<Last> >
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: fusion::result_of::distance<First, Last>
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{};
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}}
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#endif
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