1 | /* Copyright 2003-2005 Joaquín M López Muñoz.
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2 | * Distributed under the Boost Software License, Version 1.0.
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3 | * (See accompanying file LICENSE_1_0.txt or copy at
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4 | * http://www.boost.org/LICENSE_1_0.txt)
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5 | *
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6 | * See http://www.boost.org/libs/multi_index for library home page.
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7 | */
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8 |
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9 | #ifndef BOOST_MULTI_INDEX_DETAIL_BASE_TYPE_HPP
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10 | #define BOOST_MULTI_INDEX_DETAIL_BASE_TYPE_HPP
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11 |
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12 | #if defined(_MSC_VER)&&(_MSC_VER>=1200)
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13 | #pragma once
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14 | #endif
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15 |
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16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
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17 | #include <boost/detail/workaround.hpp>
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18 | #include <boost/mpl/at.hpp>
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19 | #include <boost/mpl/apply.hpp>
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20 | #include <boost/mpl/size.hpp>
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21 | #include <boost/multi_index/detail/index_base.hpp>
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22 | #include <boost/multi_index/detail/is_index_list.hpp>
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23 | #include <boost/multi_index/detail/msvc_index_specifier.hpp>
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24 | #include <boost/static_assert.hpp>
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25 |
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26 | namespace boost{
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27 |
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28 | namespace multi_index{
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29 |
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30 | namespace detail{
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31 |
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32 | /* MPL machinery to construct a linear hierarchy of indices out of
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33 | * a index list.
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34 | */
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35 |
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36 | #if BOOST_WORKAROUND(BOOST_MSVC,<1310)
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37 | struct index_applier
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38 | {
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39 | template<typename IndexSpecifierMeta,typename SuperMeta>
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40 | struct apply:
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41 | msvc_index_specifier<IndexSpecifierMeta::type>::
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42 | template result_index_class<SuperMeta>
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43 | {
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44 | };
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45 | };
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46 | #else
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47 | struct index_applier
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48 | {
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49 | template<typename IndexSpecifierMeta,typename Super>
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50 | struct apply
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51 | {
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52 | typedef typename IndexSpecifierMeta::type index_specifier;
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53 | typedef typename index_specifier::
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54 | BOOST_NESTED_TEMPLATE index_class<Super>::type type;
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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 | template<int N,typename Value,typename IndexSpecifierList,typename Allocator>
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60 | struct nth_layer
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61 | {
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62 | BOOST_STATIC_CONSTANT(int,length=mpl::size<IndexSpecifierList>::value);
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63 |
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64 | typedef typename mpl::eval_if_c<
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65 | N==length,
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66 | mpl::identity<index_base<Value,IndexSpecifierList,Allocator> >,
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67 | mpl::apply2<
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68 | index_applier,
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69 | mpl::at_c<IndexSpecifierList,N>,
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70 | nth_layer<N+1,Value,IndexSpecifierList,Allocator>
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71 | >
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72 | >::type type;
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73 | };
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74 |
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75 | template<typename Value,typename IndexSpecifierList,typename Allocator>
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76 | struct multi_index_base_type:nth_layer<0,Value,IndexSpecifierList,Allocator>
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77 | {
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78 | BOOST_STATIC_ASSERT(detail::is_index_list<IndexSpecifierList>::value);
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79 | };
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80 |
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81 | } /* namespace multi_index::detail */
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82 |
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83 | } /* namespace multi_index */
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84 |
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85 | } /* namespace boost */
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86 |
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87 | #endif
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