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 | Copyright (c) 2005 Eric Niebler
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5 |
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6 | Use, modification and distribution is subject to the Boost Software
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7 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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8 | http://www.boost.org/LICENSE_1_0.txt)
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9 | ==============================================================================*/
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10 | #if !defined(FUSION_ITERATOR_CONS_ITERATOR_HPP)
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11 | #define FUSION_ITERATOR_CONS_ITERATOR_HPP
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12 |
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13 | #include <boost/mpl/aux_/na_fwd.hpp>
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14 | #include <boost/mpl/iterator_tags.hpp>
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15 | #include <boost/spirit/fusion/iterator/as_fusion_iterator.hpp>
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16 | #include <boost/spirit/fusion/iterator/detail/iterator_base.hpp>
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17 | #include <boost/spirit/fusion/sequence/detail/sequence_base.hpp>
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18 | #include <boost/spirit/fusion/iterator/detail/cons_iterator/deref_traits.hpp>
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19 | #include <boost/spirit/fusion/iterator/detail/cons_iterator/next_traits.hpp>
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20 | #include <boost/spirit/fusion/iterator/detail/cons_iterator/value_traits.hpp>
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21 |
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22 | namespace boost { namespace fusion
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23 | {
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24 | struct nil;
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25 |
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26 | struct cons_iterator_tag;
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27 |
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28 | template <typename Cons = nil>
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29 | struct cons_iterator : iterator_base<cons_iterator<Cons> >
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30 | {
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31 | typedef cons_iterator_tag tag;
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32 | typedef Cons cons_type;
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33 | typedef mpl::forward_iterator_tag category;
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34 |
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35 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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36 | typedef typename cons_detail::next_traits_impl<cons_iterator>::type next;
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37 | typedef typename cons_detail::value_traits_impl<cons_iterator>::type type;
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38 | #endif
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39 |
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40 | explicit cons_iterator(cons_type& cons_)
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41 | : cons(cons_) {}
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42 |
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43 | cons_type& cons;
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44 | private:
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45 | cons_iterator& operator=(cons_iterator const&);
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46 | };
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47 |
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48 | template <>
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49 | struct cons_iterator<nil> : iterator_base<cons_iterator<nil> >
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50 | {
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51 | typedef cons_iterator_tag tag;
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52 | typedef nil cons_type;
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53 | typedef mpl::forward_iterator_tag category;
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54 |
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55 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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56 | typedef cons_iterator next;
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57 | typedef mpl::na type;
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58 | #endif
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59 |
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60 | cons_iterator() {}
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61 | explicit cons_iterator(nil const&) {}
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62 | };
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63 |
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64 | template <>
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65 | struct cons_iterator<nil const> : iterator_base<cons_iterator<nil const> >
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66 | {
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67 | typedef cons_iterator_tag tag;
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68 | typedef nil const cons_type;
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69 | typedef mpl::forward_iterator_tag category;
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70 |
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71 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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72 | typedef cons_iterator next;
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73 | typedef mpl::na type;
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74 | #endif
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75 |
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76 | cons_iterator() {}
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77 | explicit cons_iterator(nil const&) {}
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78 | };
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79 | }}
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80 |
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81 | #endif
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