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 |
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5 | Use, modification and distribution is subject to the Boost Software
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6 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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7 | http://www.boost.org/LICENSE_1_0.txt)
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8 | ==============================================================================*/
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9 | #if !defined(FUSION_ITERATOR_DETAIL_TRANSFORM_VIEW_ITERATOR_DEREF_TRAITS_HPP)
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10 | #define FUSION_ITERATOR_DETAIL_TRANSFORM_VIEW_ITERATOR_DEREF_TRAITS_HPP
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11 |
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12 | #include <boost/spirit/fusion/detail/config.hpp>
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13 | #include <boost/spirit/fusion/iterator/deref.hpp>
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14 | #include <boost/spirit/fusion/iterator/value_of.hpp>
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15 |
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16 | namespace boost { namespace fusion
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17 | {
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18 | struct transform_view_iterator_tag;
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19 |
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20 | namespace transform_view_detail {
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21 | template<typename Iterator>
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22 | struct deref_traits_impl {
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23 | typedef typename
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24 | meta::value_of<typename Iterator::first_type>::type
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25 | value_type;
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26 |
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27 | typedef typename Iterator::transform_type transform_type;
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28 | typedef typename fusion_apply1<transform_type, value_type>::type type;
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29 |
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30 | static type
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31 | call(Iterator const& i);
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32 | };
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33 |
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34 | template<typename Iterator>
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35 | BOOST_DEDUCED_TYPENAME deref_traits_impl<Iterator>::type
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36 | deref_traits_impl<Iterator>::call(Iterator const& i)
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37 | {
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38 | return i.f(*i.first);
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39 | }
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40 | }
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41 |
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42 | namespace meta
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43 | {
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44 | template <typename Tag>
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45 | struct deref_impl;
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46 |
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47 | template <>
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48 | struct deref_impl<transform_view_iterator_tag>
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49 | {
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50 | template <typename Iterator>
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51 | struct apply : transform_view_detail::deref_traits_impl<Iterator>
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52 | {};
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53 | };
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54 | }
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55 | }}
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56 |
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57 | #endif
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58 |
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59 |
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