1 | /*=============================================================================
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2 | Copyright (c) 2001-2006 Joel de Guzman
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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 | #if !defined(FUSION_NEXT_IMPL_07162005_0136)
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8 | #define FUSION_NEXT_IMPL_07162005_0136
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9 |
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10 | #include <boost/fusion/iterator/next.hpp>
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11 | #include <boost/fusion/iterator/equal_to.hpp>
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12 | #include <boost/mpl/if.hpp>
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13 |
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14 | namespace boost { namespace fusion
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15 | {
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16 | struct joint_view_iterator_tag;
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17 |
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18 | template <typename First, typename Last, typename Concat>
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19 | struct joint_view_iterator;
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20 |
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21 | namespace extension
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22 | {
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23 | template <typename Tag>
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24 | struct next_impl;
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25 |
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26 | template <>
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27 | struct next_impl<joint_view_iterator_tag>
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28 | {
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29 | template <typename Iterator>
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30 | struct apply
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31 | {
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32 | typedef typename Iterator::first_type first_type;
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33 | typedef typename Iterator::last_type last_type;
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34 | typedef typename Iterator::concat_type concat_type;
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35 | typedef typename result_of::next<first_type>::type next_type;
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36 | typedef result_of::equal_to<next_type, last_type> equal_to;
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37 |
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38 | typedef typename
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39 | mpl::if_<
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40 | equal_to
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41 | , concat_type
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42 | , joint_view_iterator<next_type, last_type, concat_type>
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43 | >::type
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44 | type;
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45 |
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46 | static type
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47 | call(Iterator const& i, mpl::true_)
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48 | {
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49 | return i.concat;
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50 | }
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51 |
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52 | static type
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53 | call(Iterator const& i, mpl::false_)
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54 | {
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55 | return type(fusion::next(i.first), i.concat);
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56 | }
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57 |
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58 | static type
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59 | call(Iterator const& i)
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60 | {
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61 | return call(i, equal_to());
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62 | }
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63 | };
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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 | #endif
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69 |
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70 |
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