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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 sources/features.hpp | |
9 | * \author Andrey Semashev | |
10 | * \date 17.07.2009 | |
11 | * | |
12 | * The header contains definition of a features list class template. | |
13 | */ | |
14 | ||
15 | #ifndef BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_ | |
16 | #define BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_ | |
17 | ||
18 | #include <boost/mpl/lambda.hpp> | |
19 | #include <boost/log/detail/config.hpp> | |
20 | ||
21 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
22 | #pragma once | |
23 | #endif | |
24 | ||
25 | #if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) | |
26 | ||
27 | #include <boost/preprocessor/repetition/enum_params.hpp> | |
28 | #include <boost/preprocessor/repetition/enum_binary_params.hpp> | |
29 | #include <boost/preprocessor/repetition/enum_shifted_params.hpp> | |
30 | #include <boost/preprocessor/facilities/intercept.hpp> | |
31 | ||
32 | //! The macro defines the maximum number of features that can be specified for a logger | |
33 | #ifndef BOOST_LOG_FEATURES_LIMIT | |
34 | #define BOOST_LOG_FEATURES_LIMIT 10 | |
35 | #endif // BOOST_LOG_FEATURES_LIMIT | |
36 | ||
37 | #endif | |
38 | ||
39 | #include <boost/log/detail/header.hpp> | |
40 | ||
41 | namespace boost { | |
42 | ||
43 | BOOST_LOG_OPEN_NAMESPACE | |
44 | ||
45 | namespace sources { | |
46 | ||
47 | #if defined(BOOST_LOG_DOXYGEN_PASS) || !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) | |
48 | ||
49 | /*! | |
50 | * \brief A type sequence of logger features | |
51 | * | |
52 | * This class template can be used to specify logger features in a \c basic_composite_logger instantiation. | |
53 | */ | |
54 | template< typename... FeaturesT > | |
55 | struct features | |
56 | { | |
57 | }; | |
58 | ||
59 | namespace aux { | |
60 | ||
61 | //! The metafunction produces the inherited features hierarchy with \c RootT as the ultimate base type | |
62 | template< typename RootT, typename FeaturesT > | |
63 | struct inherit_features; | |
64 | ||
65 | template< typename RootT, typename FeatureT0, typename... FeaturesT > | |
66 | struct inherit_features< RootT, features< FeatureT0, FeaturesT... > > | |
67 | { | |
68 | typedef typename mpl::lambda< | |
69 | FeatureT0 | |
70 | >::type::BOOST_NESTED_TEMPLATE apply< | |
71 | typename inherit_features< | |
72 | RootT, | |
73 | features< FeaturesT... > | |
74 | >::type | |
75 | >::type type; | |
76 | }; | |
77 | ||
78 | template< typename RootT, typename FeatureT0 > | |
79 | struct inherit_features< RootT, features< FeatureT0 > > | |
80 | { | |
81 | typedef typename mpl::lambda< | |
82 | FeatureT0 | |
83 | >::type::BOOST_NESTED_TEMPLATE apply< | |
84 | RootT | |
85 | >::type type; | |
86 | }; | |
87 | ||
88 | template< typename RootT > | |
89 | struct inherit_features< RootT, features< > > | |
90 | { | |
91 | typedef RootT type; | |
92 | }; | |
93 | ||
94 | } // namespace aux | |
95 | ||
96 | #else | |
97 | ||
98 | //! A type sequence of logger features | |
99 | template< BOOST_PP_ENUM_BINARY_PARAMS(BOOST_LOG_FEATURES_LIMIT, typename FeatureT, = void BOOST_PP_INTERCEPT) > | |
100 | struct features | |
101 | { | |
102 | }; | |
103 | ||
104 | namespace aux { | |
105 | ||
106 | template< typename RootT, typename FeaturesT > | |
107 | struct inherit_features; | |
108 | ||
109 | template< typename RootT, BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, typename FeatureT) > | |
110 | struct inherit_features< RootT, features< BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, FeatureT) > > | |
111 | { | |
112 | typedef typename mpl::lambda< | |
113 | FeatureT0 | |
114 | >::type::BOOST_NESTED_TEMPLATE apply< | |
115 | typename inherit_features< | |
116 | RootT, | |
117 | features< BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_LOG_FEATURES_LIMIT, FeatureT) > | |
118 | >::type | |
119 | >::type type; | |
120 | }; | |
121 | ||
122 | template< typename RootT, typename FeatureT0 > | |
123 | struct inherit_features< RootT, features< FeatureT0, BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_LOG_FEATURES_LIMIT, void BOOST_PP_INTERCEPT) > > | |
124 | { | |
125 | typedef typename mpl::lambda< | |
126 | FeatureT0 | |
127 | >::type::BOOST_NESTED_TEMPLATE apply< | |
128 | RootT | |
129 | >::type type; | |
130 | }; | |
131 | ||
132 | template< typename RootT > | |
133 | struct inherit_features< RootT, features< BOOST_PP_ENUM_PARAMS(BOOST_LOG_FEATURES_LIMIT, void BOOST_PP_INTERCEPT) > > | |
134 | { | |
135 | typedef RootT type; | |
136 | }; | |
137 | ||
138 | } // namespace aux | |
139 | ||
140 | #endif | |
141 | ||
142 | } // namespace sources | |
143 | ||
144 | BOOST_LOG_CLOSE_NAMESPACE // namespace log | |
145 | ||
146 | } // namespace boost | |
147 | ||
148 | #include <boost/log/detail/footer.hpp> | |
149 | ||
150 | #endif // BOOST_LOG_SOURCES_FEATURES_HPP_INCLUDED_ |