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_UNBOUNDED_HPP |
10 | #define BOOST_MULTI_INDEX_DETAIL_UNBOUNDED_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 | |
19 | namespace boost{ |
20 | |
21 | namespace multi_index{ |
22 | |
23 | /* dummy type and variable for use in ordered_index::range() */ |
24 | |
25 | /* ODR-abiding technique shown at the example attached to |
26 | * http://lists.boost.org/Archives/boost/2006/07/108355.php |
27 | */ |
28 | |
29 | namespace detail{class unbounded_helper;} |
30 | |
31 | detail::unbounded_helper unbounded(detail::unbounded_helper); |
32 | |
33 | namespace detail{ |
34 | |
35 | class unbounded_helper |
36 | { |
37 | unbounded_helper(){} |
38 | unbounded_helper(const unbounded_helper&){} |
39 | friend unbounded_helper multi_index::unbounded(unbounded_helper); |
40 | }; |
41 | |
42 | typedef unbounded_helper (*unbounded_type)(unbounded_helper); |
43 | |
44 | } /* namespace multi_index::detail */ |
45 | |
46 | inline detail::unbounded_helper unbounded(detail::unbounded_helper) |
47 | { |
48 | return detail::unbounded_helper(); |
49 | } |
50 | |
51 | /* tags used in the implementation of range */ |
52 | |
53 | namespace detail{ |
54 | |
55 | struct none_unbounded_tag{}; |
56 | struct lower_unbounded_tag{}; |
57 | struct upper_unbounded_tag{}; |
58 | struct both_unbounded_tag{}; |
59 | |
60 | } /* namespace multi_index::detail */ |
61 | |
62 | } /* namespace multi_index */ |
63 | |
64 | } /* namespace boost */ |
65 | |
66 | #endif |
67 |