122 lines
3.7 KiB
Plaintext
122 lines
3.7 KiB
Plaintext
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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_STD_TUPLE_ITERATOR_09112011_1905)
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#define FUSION_STD_TUPLE_ITERATOR_09112011_1905
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/iterator/iterator_facade.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/fusion/support/detail/access.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/if.hpp>
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#include <tuple>
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#include <utility>
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namespace boost { namespace fusion
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{
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struct random_access_traversal_tag;
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template <typename Tuple, int Index>
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struct std_tuple_iterator_identity;
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template <typename Tuple, int Index>
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struct std_tuple_iterator
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: iterator_facade<
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std_tuple_iterator<Tuple, Index>
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, random_access_traversal_tag>
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{
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typedef Tuple tuple_type;
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static int const index = Index;
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typedef std_tuple_iterator_identity<
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typename add_const<Tuple>::type, Index>
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identity;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit std_tuple_iterator(Tuple& tuple)
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: tuple(tuple) {}
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Tuple& tuple;
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template <typename Iterator>
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struct value_of
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: std::tuple_element<Iterator::index,
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typename remove_const<typename Iterator::tuple_type>::type> {};
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template <typename Iterator>
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struct deref
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{
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typedef typename value_of<Iterator>::type element;
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typedef typename
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mpl::if_<
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is_const<typename Iterator::tuple_type>
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, typename fusion::detail::cref_result<element>::type
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, typename fusion::detail::ref_result<element>::type
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>::type
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Iterator const& iter)
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{
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return std::get<Index>(iter.tuple);
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}
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};
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template <typename Iterator, typename N>
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struct advance
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{
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static int const index = Iterator::index;
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typedef typename Iterator::tuple_type tuple_type;
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typedef std_tuple_iterator<tuple_type, index+N::value> type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Iterator const& i)
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{
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return type(i.tuple);
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}
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};
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template <typename Iterator>
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struct next : advance<Iterator, mpl::int_<1>> {};
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template <typename Iterator>
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struct prior : advance<Iterator, mpl::int_<-1>> {};
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template <typename I1, typename I2>
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struct equal_to
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: is_same<typename I1::identity, typename I2::identity> {};
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template <typename First, typename Last>
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struct distance
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{
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typedef mpl::int_<Last::index-First::index> type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(First const&, Last const&)
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{
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return type();
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}
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};
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};
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}}
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#ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408
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namespace std
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{
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template <typename Tuple, int Index>
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struct iterator_traits< ::boost::fusion::std_tuple_iterator<Tuple, Index> >
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{ };
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}
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#endif
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#endif
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