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1 | /* |
2 | * Copyright Andrey Semashev 2007 - 2015. | |
3 | * Distributed under the Boost Software License, Version 1.0. | |
4 | * (See accompanying file LICENSE_1_0.txt or copy at | |
5 | * http://www.boost.org/LICENSE_1_0.txt) | |
6 | */ | |
7 | /*! | |
8 | * \file is_keyword_descriptor.hpp | |
9 | * \author Andrey Semashev | |
10 | * \date 14.07.2012 | |
11 | * | |
12 | * The header contains attribute keyword descriptor detection trait. | |
13 | */ | |
14 | ||
15 | #ifndef BOOST_LOG_EXPRESSIONS_IS_KEYWORD_DESCRIPTOR_HPP_INCLUDED_ | |
16 | #define BOOST_LOG_EXPRESSIONS_IS_KEYWORD_DESCRIPTOR_HPP_INCLUDED_ | |
17 | ||
18 | #include <boost/mpl/bool.hpp> | |
19 | #include <boost/log/detail/config.hpp> | |
20 | #include <boost/log/detail/header.hpp> | |
21 | ||
22 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
23 | #pragma once | |
24 | #endif | |
25 | ||
26 | namespace boost { | |
27 | ||
28 | BOOST_LOG_OPEN_NAMESPACE | |
29 | ||
30 | namespace expressions { | |
31 | ||
32 | /*! | |
33 | * Base class for keyword descriptors. All keyword descriptors must derive from this class to support the \c is_keyword_descriptor trait. | |
34 | */ | |
35 | struct keyword_descriptor | |
36 | { | |
37 | #ifndef BOOST_LOG_DOXYGEN_PASS | |
38 | typedef void _is_boost_log_keyword_descriptor; | |
39 | #endif // BOOST_LOG_DOXYGEN_PASS | |
40 | }; | |
41 | ||
42 | /*! | |
43 | * The metafunction detects if the type \c T is a keyword descriptor | |
44 | */ | |
45 | template< typename T, typename VoidT = void > | |
46 | struct is_keyword_descriptor : | |
47 | public mpl::false_ | |
48 | { | |
49 | }; | |
50 | ||
51 | #ifndef BOOST_LOG_DOXYGEN_PASS | |
52 | template< typename T > | |
53 | struct is_keyword_descriptor< T, typename T::_is_boost_log_keyword_descriptor > : | |
54 | public mpl::true_ | |
55 | { | |
56 | }; | |
57 | #endif | |
58 | ||
59 | } // namespace expressions | |
60 | ||
61 | BOOST_LOG_CLOSE_NAMESPACE // namespace log | |
62 | ||
63 | } // namespace boost | |
64 | ||
65 | #include <boost/log/detail/footer.hpp> | |
66 | ||
67 | #endif // BOOST_LOG_EXPRESSIONS_IS_KEYWORD_DESCRIPTOR_HPP_INCLUDED_ |