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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_logger.hpp>
- #include <boost/log/sources/record_ostream.hpp>
- #include <boost/log/utility/formatting_ostream.hpp>
- #include <boost/log/utility/manipulators/to_log.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_attr_formatter_stream_tag
- // We define our own severity levels
- enum severity_level
- {
- normal,
- notification,
- warning,
- error,
- critical
- };
- // The operator is used for regular stream formatting
- 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;
- }
- // Attribute value tag type
- struct severity_tag;
- // The operator is used when putting the severity level to log
- logging::formatting_ostream& operator<<
- (
- logging::formatting_ostream& strm,
- logging::to_log_manip< severity_level, severity_tag > const& manip
- )
- {
- static const char* strings[] =
- {
- "NORM",
- "NTFY",
- "WARN",
- "ERRR",
- "CRIT"
- };
- severity_level level = manip.get();
- if (static_cast< std::size_t >(level) < sizeof(strings) / sizeof(*strings))
- strm << strings[level];
- else
- strm << static_cast< int >(level);
- return strm;
- }
- void init()
- {
- logging::add_console_log
- (
- std::clog,
- // This makes the sink to write log records that look like this:
- // 1: <NORM> A normal severity message
- // 2: <ERRR> An error severity message
- keywords::format =
- (
- expr::stream
- << expr::attr< unsigned int >("LineID")
- << ": <" << expr::attr< severity_level, severity_tag >("Severity")
- << "> " << expr::smessage
- )
- );
- }
- //]
- int main(int, char*[])
- {
- init();
- logging::add_common_attributes();
- src::severity_logger< severity_level > lg;
- // These messages will be written with CAPS severity levels
- BOOST_LOG_SEV(lg, normal) << "A normal severity message";
- BOOST_LOG_SEV(lg, notification) << "A notification severity message";
- BOOST_LOG_SEV(lg, warning) << "A warning severity message";
- BOOST_LOG_SEV(lg, error) << "An error severity message";
- BOOST_LOG_SEV(lg, critical) << "A critical severity message";
- // This line will still use lower-case severity levels
- std::cout << "The regular output still uses lower-case formatting: " << normal << std::endl;
- return 0;
- }
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