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1 | /* Copyright 2003-2014 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_CONS_STDTUPLE_HPP | |
10 | #define BOOST_MULTI_INDEX_DETAIL_CONS_STDTUPLE_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/mpl/if.hpp> | |
18 | #include <boost/tuple/tuple.hpp> | |
19 | #include <tuple> | |
20 | ||
21 | namespace boost{ | |
22 | ||
23 | namespace multi_index{ | |
24 | ||
25 | namespace detail{ | |
26 | ||
27 | /* std::tuple wrapper providing the cons-based interface of boost::tuple for | |
28 | * composite_key interoperability. | |
29 | */ | |
30 | ||
31 | template<typename StdTuple,std::size_t N> | |
32 | struct cons_stdtuple; | |
33 | ||
34 | struct cons_stdtuple_ctor_terminal | |
35 | { | |
36 | typedef boost::tuples::null_type result_type; | |
37 | ||
38 | template<typename StdTuple> | |
39 | static result_type create(const StdTuple&) | |
40 | { | |
41 | return boost::tuples::null_type(); | |
42 | } | |
43 | }; | |
44 | ||
45 | template<typename StdTuple,std::size_t N> | |
46 | struct cons_stdtuple_ctor_normal | |
47 | { | |
48 | typedef cons_stdtuple<StdTuple,N> result_type; | |
49 | ||
50 | static result_type create(const StdTuple& t) | |
51 | { | |
52 | return result_type(t); | |
53 | } | |
54 | }; | |
55 | ||
56 | template<typename StdTuple,std::size_t N=0> | |
57 | struct cons_stdtuple_ctor: | |
58 | boost::mpl::if_c< | |
59 | N<std::tuple_size<StdTuple>::value, | |
60 | cons_stdtuple_ctor_normal<StdTuple,N>, | |
61 | cons_stdtuple_ctor_terminal | |
62 | >::type | |
63 | {}; | |
64 | ||
65 | template<typename StdTuple,std::size_t N> | |
66 | struct cons_stdtuple | |
67 | { | |
68 | typedef typename std::tuple_element<N,StdTuple>::type head_type; | |
69 | typedef cons_stdtuple_ctor<StdTuple,N+1> tail_ctor; | |
70 | typedef typename tail_ctor::result_type tail_type; | |
71 | ||
72 | cons_stdtuple(const StdTuple& t_):t(t_){} | |
73 | ||
74 | const head_type& get_head()const{return std::get<N>(t);} | |
75 | tail_type get_tail()const{return tail_ctor::create(t);} | |
76 | ||
77 | const StdTuple& t; | |
78 | }; | |
79 | ||
80 | template<typename StdTuple> | |
81 | typename cons_stdtuple_ctor<StdTuple>::result_type | |
82 | make_cons_stdtuple(const StdTuple& t) | |
83 | { | |
84 | return cons_stdtuple_ctor<StdTuple>::create(t); | |
85 | } | |
86 | ||
87 | } /* namespace multi_index::detail */ | |
88 | ||
89 | } /* namespace multi_index */ | |
90 | ||
91 | } /* namespace boost */ | |
92 | ||
93 | #endif |