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_FILTER_VIEW_BEGIN_END_TRAITS_HPP)
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9 | #define FUSION_SEQUENCE_DETAIL_FILTER_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 filter_view_tag;
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16 |
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17 | template <typename View, typename Pred>
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18 | struct filter_view;
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19 |
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20 | template <typename First, typename Last, typename Pred>
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21 | struct filter_iterator;
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22 |
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23 | namespace meta
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24 | {
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25 | template <typename Tag>
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26 | struct begin_impl;
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27 |
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28 | template <>
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29 | struct begin_impl<filter_view_tag>
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30 | {
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31 | template <typename Sequence>
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32 | struct apply
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33 | {
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34 | typedef typename Sequence::first_type first_type;
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35 | typedef typename Sequence::last_type last_type;
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36 | typedef typename Sequence::pred_type pred_type;
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37 | typedef filter_iterator<first_type, last_type, pred_type> type;
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38 |
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39 | static type
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40 | call(Sequence& s)
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41 | {
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42 | return type(s.first);
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43 | }
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44 | };
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45 | };
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46 |
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47 | template <typename Tag>
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48 | struct end_impl;
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49 |
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50 | template <>
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51 | struct end_impl<filter_view_tag>
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52 | {
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53 | template <typename Sequence>
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54 | struct apply
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55 | {
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56 | typedef typename Sequence::last_type last_type;
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57 | typedef typename Sequence::pred_type pred_type;
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58 | typedef filter_iterator<last_type, last_type, pred_type> type;
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59 |
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60 | static type
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61 | call(Sequence& s)
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62 | {
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63 | return type(s.last);
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64 | }
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65 | };
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66 | };
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67 | }
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68 | }}
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69 |
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70 | namespace boost { namespace mpl
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71 | {
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72 | template <typename Tag>
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73 | struct begin_impl;
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74 |
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75 | template <typename Tag>
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76 | struct end_impl;
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77 |
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78 | template <>
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79 | struct begin_impl<fusion::filter_view_tag>
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80 | : fusion::meta::begin_impl<fusion::filter_view_tag> {};
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81 |
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82 | template <>
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83 | struct end_impl<fusion::filter_view_tag>
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84 | : fusion::meta::end_impl<fusion::filter_view_tag> {};
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85 | }}
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86 |
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87 | #endif
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88 |
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89 |
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