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1 /*=============================================================================
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2 Copyright (c) 2007 Tobias Schwinger
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3
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4 Distributed under the Boost Software License, Version 1.0. (See accompanying
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5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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6 ==============================================================================*/
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7
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8 #if !defined(BOOST_FUSION_REPETITIVE_VIEW_NEXT_IMPL_HPP_INCLUDED)
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9 #define BOOST_FUSION_REPETITIVE_VIEW_NEXT_IMPL_HPP_INCLUDED
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10
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11 #include <boost/fusion/support/config.hpp>
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12 #include <boost/fusion/iterator/next.hpp>
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13 #include <boost/fusion/iterator/equal_to.hpp>
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14
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15 namespace boost { namespace fusion
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16 {
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17 struct repetitive_view_iterator_tag;
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18
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19 template <typename Sequence, typename Pos>
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20 struct repetitive_view_iterator;
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21
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22 namespace extension
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23 {
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24 template <typename Tag>
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25 struct next_impl;
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26
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27 template <>
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28 struct next_impl<repetitive_view_iterator_tag>
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29 {
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30 template<typename Iterator,
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31 bool Last = result_of::equal_to<typename Iterator::end_type,
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32 typename result_of::next<
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33 typename Iterator::pos_type
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34 >::type>::value >
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35 struct apply_nonempty // <Iterator,false>
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36 {
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37 // advanvce to next position
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38
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39 typedef repetitive_view_iterator<
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40 typename Iterator::sequence_type,
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41 typename result_of::next<typename Iterator::pos_type>::type
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42 >
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43 type;
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44
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45 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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46 static type call(Iterator const& i)
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47 {
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48 return type(i.seq, next(i.pos));
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49 }
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50 };
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51 template <typename Iterator>
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52 struct apply_nonempty<Iterator,true>
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53 {
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54 // reset to beginning
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55
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56 typedef repetitive_view_iterator<
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57 typename Iterator::sequence_type,
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58 typename Iterator::first_type
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59 >
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60 type;
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61
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62 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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63 static type call(Iterator const& i)
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64 {
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65 return type(i.seq);
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66 }
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67 };
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68
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69 template <typename Iterator,
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70 bool Empty = result_of::equal_to<typename Iterator::end_type,
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71 typename Iterator::pos_type>::value >
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72 struct apply // <Iterator,false>
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73 : apply_nonempty<Iterator>
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74 { };
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75
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76 template <typename Iterator>
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77 struct apply<Iterator,true>
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78 {
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79 // eps^n = eps
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80
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81 typedef Iterator type;
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82
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83 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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84 static type call(Iterator const& i)
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85 {
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86 return type(i);
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87 }
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88 };
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89 };
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90 }
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91 }}
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92
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93 #endif
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94
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