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_ITERATOR_DETAIL_SINGLE_VIEW_ITERATOR_DEREF_TRAITS_HPP)
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9 | #define FUSION_ITERATOR_DETAIL_SINGLE_VIEW_ITERATOR_DEREF_TRAITS_HPP
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10 |
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11 | #include <boost/spirit/fusion/detail/config.hpp>
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12 | #include <boost/spirit/fusion/detail/access.hpp>
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13 | #include <boost/mpl/identity.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 | namespace detail
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18 | {
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19 | template <typename SingleView>
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20 | struct single_view_access_result
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21 | {
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22 | typedef typename
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23 | mpl::eval_if<
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24 | is_const<SingleView>
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25 | , cref_result<mpl::identity<FUSION_GET_VALUE_TYPE(SingleView)> >
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26 | , ref_result<mpl::identity<FUSION_GET_VALUE_TYPE(SingleView)> >
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27 | >::type
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28 | type;
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29 | };
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30 | }
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31 |
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32 | namespace single_view_iterator_detail
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33 | {
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34 | template <typename Iterator>
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35 | struct deref_traits_impl
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36 | {
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37 | typedef typename Iterator::single_view_type single_view_type;
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38 | typedef typename detail::single_view_access_result<
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39 | single_view_type>::type
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40 | type;
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41 |
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42 | static type
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43 | call(Iterator const& i);
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44 | };
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45 |
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46 | template <typename Iterator>
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47 | inline typename deref_traits_impl<Iterator>::type
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48 | deref_traits_impl<Iterator>::call(Iterator const& i)
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49 | {
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50 | return detail::ref(i.view.val);
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51 | }
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52 | }
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53 |
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54 | struct single_view_iterator_tag;
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55 |
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56 | namespace meta
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57 | {
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58 | template <typename Tag>
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59 | struct deref_impl;
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60 |
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61 | template <>
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62 | struct deref_impl<single_view_iterator_tag>
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63 | {
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64 | template <typename Iterator>
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65 | struct apply : single_view_iterator_detail::deref_traits_impl<Iterator> {};
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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 | #endif
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71 |
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72 |
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