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- /*
- * Copyright Andrey Semashev 2007 - 2015.
- * 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/log/expressions.hpp>
- #include <boost/log/sources/severity_channel_logger.hpp>
- #include <boost/log/sources/record_ostream.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;
- //[ example_expressions_channel_severity_filter
- // We define our own severity levels
- enum severity_level
- {
- normal,
- notification,
- warning,
- error,
- critical
- };
- // Define the attribute keywords
- BOOST_LOG_ATTRIBUTE_KEYWORD(line_id, "LineID", unsigned int)
- BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", severity_level)
- BOOST_LOG_ATTRIBUTE_KEYWORD(channel, "Channel", std::string)
- //<-
- 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;
- }
- //->
- void init()
- {
- // Create a minimal severity table filter
- typedef expr::channel_severity_filter_actor< std::string, severity_level > min_severity_filter;
- min_severity_filter min_severity = expr::channel_severity_filter(channel, severity);
- // Set up the minimum severity levels for different channels
- min_severity["general"] = notification;
- min_severity["network"] = warning;
- min_severity["gui"] = error;
- logging::add_console_log
- (
- std::clog,
- keywords::filter = min_severity || severity >= critical,
- keywords::format =
- (
- expr::stream
- << line_id
- << ": <" << severity
- << "> [" << channel << "] "
- << expr::smessage
- )
- );
- }
- // Define our logger type
- typedef src::severity_channel_logger< severity_level, std::string > logger_type;
- void test_logging(logger_type& lg, std::string const& channel_name)
- {
- BOOST_LOG_CHANNEL_SEV(lg, channel_name, normal) << "A normal severity level message";
- BOOST_LOG_CHANNEL_SEV(lg, channel_name, notification) << "A notification severity level message";
- BOOST_LOG_CHANNEL_SEV(lg, channel_name, warning) << "A warning severity level message";
- BOOST_LOG_CHANNEL_SEV(lg, channel_name, error) << "An error severity level message";
- BOOST_LOG_CHANNEL_SEV(lg, channel_name, critical) << "A critical severity level message";
- }
- //]
- int main(int, char*[])
- {
- init();
- logging::add_common_attributes();
- logger_type lg;
- test_logging(lg, "general");
- test_logging(lg, "network");
- test_logging(lg, "gui");
- test_logging(lg, "filesystem");
- return 0;
- }
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