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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_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 |