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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 | #include <cstddef> | |
9 | #include <iostream> | |
10 | #include <boost/log/core.hpp> | |
11 | #include <boost/log/expressions.hpp> | |
12 | #include <boost/log/attributes.hpp> | |
13 | #include <boost/log/utility/value_ref.hpp> | |
14 | ||
15 | namespace logging = boost::log; | |
16 | namespace expr = boost::log::expressions; | |
17 | namespace sinks = boost::log::sinks; | |
18 | namespace attrs = boost::log::attributes; | |
19 | namespace keywords = boost::log::keywords; | |
20 | ||
21 | // We define our own severity levels | |
22 | enum severity_level | |
23 | { | |
24 | normal, | |
25 | notification, | |
26 | warning, | |
27 | error, | |
28 | critical | |
29 | }; | |
30 | ||
31 | // The operator puts a human-friendly representation of the severity level to the stream | |
32 | std::ostream& operator<< (std::ostream& strm, severity_level level) | |
33 | { | |
34 | static const char* strings[] = | |
35 | { | |
36 | "normal", | |
37 | "notification", | |
38 | "warning", | |
39 | "error", | |
40 | "critical" | |
41 | }; | |
42 | ||
43 | if (static_cast< std::size_t >(level) < sizeof(strings) / sizeof(*strings)) | |
44 | strm << strings[level]; | |
45 | else | |
46 | strm << static_cast< int >(level); | |
47 | ||
48 | return strm; | |
49 | } | |
50 | ||
51 | //[ example_core_record_visitation_extraction | |
52 | //=enum severity_level { ... }; | |
53 | //=std::ostream& operator<< (std::ostream& strm, severity_level level); | |
54 | ||
55 | struct print_visitor | |
56 | { | |
57 | typedef void result_type; | |
58 | result_type operator() (severity_level level) const | |
59 | { | |
60 | std::cout << level << std::endl; | |
61 | }; | |
62 | }; | |
63 | ||
64 | // Prints severity level through visitation API | |
65 | void print_severity_visitation(logging::record const& rec) | |
66 | { | |
67 | logging::visit< severity_level >("Severity", rec, print_visitor()); | |
68 | } | |
69 | ||
70 | // Prints severity level through extraction API | |
71 | void print_severity_extraction(logging::record const& rec) | |
72 | { | |
73 | logging::value_ref< severity_level > level = logging::extract< severity_level >("Severity", rec); | |
74 | std::cout << level << std::endl; | |
75 | } | |
76 | //] | |
77 | ||
78 | //[ example_core_record_attr_value_lookup | |
79 | // Prints severity level by searching the attribute values | |
80 | void print_severity_lookup(logging::record const& rec) | |
81 | { | |
82 | logging::attribute_value_set const& values = rec.attribute_values(); | |
83 | logging::attribute_value_set::const_iterator it = values.find("Severity"); | |
84 | if (it != values.end()) | |
85 | { | |
86 | logging::attribute_value const& value = it->second; | |
87 | ||
88 | // A single attribute value can also be visited or extracted | |
89 | std::cout << value.extract< severity_level >() << std::endl; | |
90 | } | |
91 | } | |
92 | //] | |
93 | ||
94 | //[ example_core_record_subscript | |
95 | BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", severity_level) | |
96 | ||
97 | // Prints severity level by using the subscript operator | |
98 | void print_severity_subscript(logging::record const& rec) | |
99 | { | |
100 | // Use the attribute keyword to communicate the name and type of the value | |
101 | logging::value_ref< severity_level, tag::severity > level = rec[severity]; | |
102 | std::cout << level << std::endl; | |
103 | } | |
104 | //] | |
105 | ||
106 | ||
107 | int main(int, char*[]) | |
108 | { | |
109 | logging::attribute_set attrs; | |
110 | attrs.insert("Severity", attrs::make_constant(notification)); | |
111 | ||
112 | logging::record rec = logging::core::get()->open_record(attrs); | |
113 | if (rec) | |
114 | { | |
115 | print_severity_visitation(rec); | |
116 | print_severity_extraction(rec); | |
117 | print_severity_lookup(rec); | |
118 | print_severity_subscript(rec); | |
119 | } | |
120 | ||
121 | return 0; | |
122 | } |