1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* Copyright Andrey Semashev 2025.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
#include <cstddef>
#include <iostream>
#include <boost/phoenix/function/adapt_function.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/sources/severity_channel_logger.hpp>
#include <boost/log/sources/record_ostream.hpp>
#include <boost/log/utility/value_ref.hpp>
#include <boost/log/utility/setup/console.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
namespace logging = boost::log;
namespace src = boost::log::sources;
namespace expr = boost::log::expressions;
namespace keywords = boost::log::keywords;
enum severity_level
{
normal,
notification,
warning,
error,
critical
};
std::ostream& operator<< (std::ostream& strm, severity_level level)
{
static const char* strings[] =
{
"normal",
"notification",
"warning",
"error",
"critical"
};
if (static_cast< std::size_t >(level) < sizeof(strings) / sizeof(*strings))
strm << strings[level];
else
strm << static_cast< int >(level);
return strm;
}
//[ example_expressions_formatter_adapt_function
// Define the attribute keywords
BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", severity_level)
BOOST_LOG_ATTRIBUTE_KEYWORD(channel, "Channel", std::string)
// User-defined formatting function
std::string extract_channel(logging::record_view const& rec)
{
logging::value_ref< std::string, tag::channel > chan = rec[channel];
if (chan)
return chan.get();
else
return "-";
}
namespace lazy {
BOOST_PHOENIX_ADAPT_FUNCTION(std::string, extract_channel, ::extract_channel, 1)
}
void init()
{
logging::add_console_log
(
std::clog,
keywords::format =
expr::stream << "<" << severity << "> ["
<< lazy::extract_channel(boost::phoenix::placeholders::_1)
<< "] " << expr::smessage
);
}
//]
int main(int, char*[])
{
init();
logging::add_common_attributes();
src::severity_channel_logger< severity_level, std::string > lg1;
BOOST_LOG_CHANNEL_SEV(lg1, "general", normal) << "A normal severity level message";
BOOST_LOG_CHANNEL_SEV(lg1, "general", notification) << "A notification severity level message";
BOOST_LOG_CHANNEL_SEV(lg1, "general", warning) << "A warning severity level message";
BOOST_LOG_CHANNEL_SEV(lg1, "general", error) << "An error severity level message";
BOOST_LOG_CHANNEL_SEV(lg1, "general", critical) << "A critical severity level message";
src::severity_logger< severity_level > lg2;
BOOST_LOG_SEV(lg2, normal) << "A normal severity level message";
BOOST_LOG_SEV(lg2, notification) << "A notification severity level message";
BOOST_LOG_SEV(lg2, warning) << "A warning severity level message";
BOOST_LOG_SEV(lg2, error) << "An error severity level message";
BOOST_LOG_SEV(lg2, critical) << "A critical severity level message";
return 0;
}
|
