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1 | // Boost.Bimap |
2 | // | |
3 | // Copyright (c) 2006-2007 Matias Capeletto | |
4 | // | |
5 | // Distributed under the Boost Software License, Version 1.0. | |
6 | // (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | /// \file tags/support/default_tagged.hpp | |
10 | /// \brief Weak tagging | |
11 | ||
12 | #ifndef BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP | |
13 | #define BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP | |
14 | ||
15 | #if defined(_MSC_VER) | |
16 | #pragma once | |
17 | #endif | |
18 | ||
19 | #include <boost/config.hpp> | |
20 | ||
21 | #include <boost/bimap/tags/tagged.hpp> | |
22 | ||
23 | /** \struct boost::bimaps::tags::support::default_tagged | |
24 | \brief Weak tagging metafunction | |
25 | ||
26 | \code | |
27 | template< class Type, class Tag > | |
28 | struct default_tagged | |
29 | { | |
30 | typedef {TaggedType} type; | |
31 | }; | |
32 | \endcode | |
33 | ||
34 | If the type is not tagged, this metafunction returns a tagged type with the | |
35 | default tag. If it is tagged, the returns the type unchanged. | |
36 | ||
37 | See also tagged, overwrite_tagged. | |
38 | **/ | |
39 | ||
40 | #ifndef BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES | |
41 | ||
42 | namespace boost { | |
43 | namespace bimaps { | |
44 | namespace tags { | |
45 | namespace support { | |
46 | ||
47 | ||
48 | // Default Tagging | |
49 | // A metafunction that create a tagged type with a default tag value. | |
50 | ||
51 | template< class Type, class DefaultTag > | |
52 | struct default_tagged | |
53 | { | |
54 | typedef tagged<Type,DefaultTag> type; | |
55 | }; | |
56 | ||
57 | template< class Type, class OldTag, class NewTag > | |
58 | struct default_tagged< tagged< Type, OldTag >, NewTag > | |
59 | { | |
60 | typedef tagged<Type,OldTag> type; | |
61 | }; | |
62 | ||
63 | } // namespace support | |
64 | } // namespace tags | |
65 | } // namespace bimaps | |
66 | } // namespace boost | |
67 | ||
68 | #endif // BOOST_BIMAP_DOXYGEN_WILL_NOT_PROCESS_THE_FOLLOWING_LINES | |
69 | ||
70 | #endif // BOOST_BIMAP_TAGS_SUPPORT_DEFAULT_TAGGED_HPP | |
71 | ||
72 | ||
73 |