1 | /*=============================================================================
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2 | Copyright (c) 2003 Joel de Guzman
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3 | Copyright (c) 2004 Peder Holt
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4 |
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5 | Use, modification and distribution is subject to the Boost Software
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6 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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7 | http://www.boost.org/LICENSE_1_0.txt)
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8 | ==============================================================================*/
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9 | #if !defined(FUSION_ITERATOR_DETAIL_TUPLE_ITERATOR_NEXT_TRAITS_HPP)
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10 | #define FUSION_ITERATOR_DETAIL_TUPLE_ITERATOR_NEXT_TRAITS_HPP
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11 |
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12 | #include <boost/spirit/fusion/detail/config.hpp>
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13 | #include <boost/static_assert.hpp>
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14 | #include <boost/mpl/next.hpp>
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15 | #include <boost/mpl/less.hpp>
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16 |
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17 | namespace boost { namespace fusion
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18 | {
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19 | struct tuple_iterator_tag;
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20 |
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21 | template <int N, typename Tuple>
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22 | struct tuple_iterator;
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23 |
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24 | namespace detail
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25 | {
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26 | template <typename Iterator>
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27 | struct tuple_iterator_next_traits_impl
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28 | {
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29 | typedef FUSION_GET_INDEX(Iterator) index;
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30 | typedef FUSION_GET_TUPLE(Iterator) tuple_;
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31 | typedef FUSION_GET_SIZE(tuple_) size;
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32 | #if !BOOST_WORKAROUND(BOOST_MSVC,<=1300)
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33 | BOOST_STATIC_ASSERT((::boost::mpl::less<index, size>::value));
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34 | #endif
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35 | typedef typename mpl::next<index>::type next;
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36 | typedef tuple_iterator<FUSION_GET_VALUE(next), tuple_> type;
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37 |
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38 | static type
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39 | call(Iterator const& i);
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40 | };
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41 |
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42 | template <typename Iterator>
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43 | inline typename tuple_iterator_next_traits_impl<Iterator>::type
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44 | tuple_iterator_next_traits_impl<Iterator>::call(Iterator const& i)
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45 | {
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46 | return type(detail::ref(i.get_tuple()));
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47 | }
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48 | }
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49 |
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50 | namespace meta
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51 | {
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52 | template <typename Tag>
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53 | struct next_impl;
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54 |
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55 | template <>
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56 | struct next_impl<tuple_iterator_tag>
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57 | {
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58 | template <typename Iterator>
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59 | struct apply : detail::tuple_iterator_next_traits_impl<Iterator> {};
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60 | };
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61 | }
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62 | }}
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63 |
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64 | #endif
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65 |
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