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1 | /* Copyright 2003-2013 Joaquin M Lopez Munoz. |
2 | * Distributed under the Boost Software License, Version 1.0. | |
3 | * (See accompanying file LICENSE_1_0.txt or copy at | |
4 | * http://www.boost.org/LICENSE_1_0.txt) | |
5 | * | |
6 | * See http://www.boost.org/libs/multi_index for library home page. | |
7 | */ | |
8 | ||
9 | #ifndef BOOST_MULTI_INDEX_DETAIL_BASE_TYPE_HPP | |
10 | #define BOOST_MULTI_INDEX_DETAIL_BASE_TYPE_HPP | |
11 | ||
12 | #if defined(_MSC_VER) | |
13 | #pragma once | |
14 | #endif | |
15 | ||
16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ | |
17 | #include <boost/detail/workaround.hpp> | |
18 | #include <boost/mpl/at.hpp> | |
19 | #include <boost/mpl/apply.hpp> | |
20 | #include <boost/mpl/size.hpp> | |
21 | #include <boost/multi_index/detail/index_base.hpp> | |
22 | #include <boost/multi_index/detail/is_index_list.hpp> | |
23 | #include <boost/static_assert.hpp> | |
24 | ||
25 | namespace boost{ | |
26 | ||
27 | namespace multi_index{ | |
28 | ||
29 | namespace detail{ | |
30 | ||
31 | /* MPL machinery to construct a linear hierarchy of indices out of | |
32 | * a index list. | |
33 | */ | |
34 | ||
35 | struct index_applier | |
36 | { | |
37 | template<typename IndexSpecifierMeta,typename SuperMeta> | |
38 | struct apply | |
39 | { | |
40 | typedef typename IndexSpecifierMeta::type index_specifier; | |
41 | typedef typename index_specifier:: | |
42 | BOOST_NESTED_TEMPLATE index_class<SuperMeta>::type type; | |
43 | }; | |
44 | }; | |
45 | ||
46 | template<int N,typename Value,typename IndexSpecifierList,typename Allocator> | |
47 | struct nth_layer | |
48 | { | |
49 | BOOST_STATIC_CONSTANT(int,length=mpl::size<IndexSpecifierList>::value); | |
50 | ||
51 | typedef typename mpl::eval_if_c< | |
52 | N==length, | |
53 | mpl::identity<index_base<Value,IndexSpecifierList,Allocator> >, | |
54 | mpl::apply2< | |
55 | index_applier, | |
56 | mpl::at_c<IndexSpecifierList,N>, | |
57 | nth_layer<N+1,Value,IndexSpecifierList,Allocator> | |
58 | > | |
59 | >::type type; | |
60 | }; | |
61 | ||
62 | template<typename Value,typename IndexSpecifierList,typename Allocator> | |
63 | struct multi_index_base_type:nth_layer<0,Value,IndexSpecifierList,Allocator> | |
64 | { | |
65 | BOOST_STATIC_ASSERT(detail::is_index_list<IndexSpecifierList>::value); | |
66 | }; | |
67 | ||
68 | } /* namespace multi_index::detail */ | |
69 | ||
70 | } /* namespace multi_index */ | |
71 | ||
72 | } /* namespace boost */ | |
73 | ||
74 | #endif |