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 message.hpp
9 * \author Andrey Semashev
10 * \date 13.07.2012
11 *
12 * The header contains log message keyword declaration.
13 */
14
15#ifndef BOOST_LOG_EXPRESSIONS_MESSAGE_HPP_INCLUDED_
16#define BOOST_LOG_EXPRESSIONS_MESSAGE_HPP_INCLUDED_
17
18#include <string>
19#include <boost/mpl/vector.hpp>
20#include <boost/log/detail/config.hpp>
21#include <boost/log/detail/default_attribute_names.hpp>
22#include <boost/log/expressions/keyword.hpp>
23#include <boost/log/expressions/is_keyword_descriptor.hpp>
24#include <boost/log/attributes/attribute_name.hpp>
25#include <boost/log/detail/header.hpp>
26
27#ifdef BOOST_HAS_PRAGMA_ONCE
28#pragma once
29#endif
30
31namespace boost {
32
33BOOST_LOG_OPEN_NAMESPACE
34
35namespace expressions {
36
37namespace tag {
38
39/*!
40 * Generic log message attribute descriptor.
41 */
42struct message :
43 public keyword_descriptor
44{
45 // The attribute value type here is not essential since message attributes are not intended to be created via the keyword
46 typedef void attribute_type;
47
48#if defined(BOOST_LOG_USE_CHAR) && defined(BOOST_LOG_USE_WCHAR_T)
49 typedef mpl::vector2< std::string, std::wstring > value_type;
50#elif defined(BOOST_LOG_USE_CHAR)
51 typedef std::string value_type;
52#elif defined(BOOST_LOG_USE_WCHAR_T)
53 typedef std::wstring value_type;
54#endif
55
56 static attribute_name get_name() { return boost::log::aux::default_attribute_names::message(); }
57};
58
59#if defined(BOOST_LOG_USE_CHAR)
60/*!
61 * Narrow character log message attribute descriptor.
62 */
63struct smessage :
64 public keyword_descriptor
65{
66 // The attribute value type here is not essential since message attributes are not intended to be created via the keyword
67 typedef void attribute_type;
68 typedef std::string value_type;
69
70 static attribute_name get_name() { return boost::log::aux::default_attribute_names::message(); }
71};
72#endif
73
74#if defined(BOOST_LOG_USE_WCHAR_T)
75/*!
76 * Wide character log message attribute descriptor.
77 */
78struct wmessage :
79 public keyword_descriptor
80{
81 // The attribute value type here is not essential since message attributes are not intended to be created via the keyword
82 typedef void attribute_type;
83 typedef std::wstring value_type;
84
85 static attribute_name get_name() { return boost::log::aux::default_attribute_names::message(); }
86};
87#endif
88
89} // namespace tag
90
91/*!
92 * Generic message keyword type.
93 */
94typedef attribute_keyword< tag::message > message_type;
95/*!
96 * Generic message keyword.
97 */
98BOOST_INLINE_VARIABLE const message_type message = {};
99
100#if defined(BOOST_LOG_USE_CHAR)
101/*!
102 * Narrow message keyword type.
103 */
104typedef attribute_keyword< tag::smessage > smessage_type;
105/*!
106 * Narrow message keyword.
107 */
108BOOST_INLINE_VARIABLE const smessage_type smessage = {};
109#endif
110
111#if defined(BOOST_LOG_USE_WCHAR_T)
112/*!
113 * Wide message keyword type.
114 */
115typedef attribute_keyword< tag::wmessage > wmessage_type;
116/*!
117 * Wide message keyword.
118 */
119BOOST_INLINE_VARIABLE const wmessage_type wmessage = {};
120#endif
121
122} // namespace expressions
123
124BOOST_LOG_CLOSE_NAMESPACE // namespace log
125
126} // namespace boost
127
128#include <boost/log/detail/footer.hpp>
129
130#endif // BOOST_LOG_EXPRESSIONS_MESSAGE_HPP_INCLUDED_
131

source code of boost/libs/log/include/boost/log/expressions/message.hpp