1 | /*=============================================================================
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2 | Copyright (c) 2003 Joel de Guzman
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3 |
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4 | Use, modification and distribution is subject to the Boost Software
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5 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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6 | http://www.boost.org/LICENSE_1_0.txt)
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7 | ==============================================================================*/
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8 | #if !defined(FUSION_SEQUENCE_DETAIL_SINGLE_VIEW_BEGIN_END_TRAITS_HPP)
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9 | #define FUSION_SEQUENCE_DETAIL_SINGLE_VIEW_BEGIN_END_TRAITS_HPP
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10 |
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11 | #include <boost/spirit/fusion/detail/config.hpp>
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12 |
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13 | namespace boost { namespace fusion
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14 | {
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15 | struct single_view_tag;
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16 |
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17 | template <typename T>
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18 | struct single_view_iterator_end;
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19 |
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20 | template <typename T>
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21 | struct single_view_iterator;
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22 |
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23 | namespace single_view_detail
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24 | {
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25 | template <typename Sequence>
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26 | struct begin_traits_impl
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27 | {
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28 | typedef single_view_iterator<Sequence> type;
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29 |
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30 | static type
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31 | call(Sequence& s);
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32 | };
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33 |
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34 | template <typename Sequence>
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35 | inline typename begin_traits_impl<Sequence>::type
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36 | begin_traits_impl<Sequence>::call(Sequence& s)
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37 | {
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38 | return type(s);
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39 | }
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40 |
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41 | template <typename Sequence>
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42 | struct end_traits_impl
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43 | {
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44 | typedef single_view_iterator_end<Sequence> type;
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45 |
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46 | static type
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47 | call(Sequence&);
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48 | };
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49 |
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50 | template <typename Sequence>
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51 | inline typename end_traits_impl<Sequence>::type
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52 | end_traits_impl<Sequence>::call(Sequence&)
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53 | {
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54 | FUSION_RETURN_DEFAULT_CONSTRUCTED;
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55 | }
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56 | }
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57 |
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58 | namespace meta
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59 | {
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60 | template <typename Tag>
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61 | struct begin_impl;
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62 |
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63 | template <>
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64 | struct begin_impl<single_view_tag>
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65 | {
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66 | template <typename Sequence>
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67 | struct apply : single_view_detail::begin_traits_impl<Sequence> {};
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68 | };
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69 |
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70 | template <typename Tag>
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71 | struct end_impl;
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72 |
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73 | template <>
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74 | struct end_impl<single_view_tag>
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75 | {
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76 | template <typename Sequence>
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77 | struct apply : single_view_detail::end_traits_impl<Sequence> {};
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78 | };
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79 | }
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80 | }}
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81 |
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82 | namespace boost { namespace mpl
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83 | {
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84 | template <typename Tag>
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85 | struct begin_impl;
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86 |
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87 | template <typename Tag>
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88 | struct end_impl;
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89 |
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90 | template <>
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91 | struct begin_impl<fusion::single_view_tag>
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92 | : fusion::meta::begin_impl<fusion::single_view_tag> {};
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93 |
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94 | template <>
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95 | struct end_impl<fusion::single_view_tag>
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96 | : fusion::meta::end_impl<fusion::single_view_tag> {};
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97 | }}
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98 |
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99 | #endif
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100 |
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101 |
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