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#include <string>#include <fstream>#include <iomanip>#include <boost/log/core.hpp>#include <boost/smart_ptr.hpp>#include <boost/log/sinks.hpp>#include <boost/log/expressions.hpp>#include <boost/log/utility/setup.hpp>#include <boost/log/sources/record_ostream.hpp>#include <boost/log/sources/severity_logger.hpp>#include <boost/log/attributes/scoped_attribute.hpp>enum severity_level{normal,notification,warning,error,critical};BOOST_LOG_ATTRIBUTE_KEYWORD(tag_attr, "Tag", std::string)BOOST_LOG_ATTRIBUTE_KEYWORD(line_id, "LineID", unsigned int)BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", severity_level)void init(){boost::log::formatter fmt = boost::log::expressions::stream<< std::setw(6) << std::setfill(‘0‘) << line_id << std::setfill(‘ ‘)<< ": <" << severity << ">\t"<< boost::log::expressions::if_(boost::log::expressions::has_attr(tag_attr))[boost::log::expressions::stream << "[" << tag_attr << "] "]<< boost::log::expressions::smessage;// Initialize sinkstypedef boost::log::sinks::synchronous_sink< boost::log::sinks::text_ostream_backend > text_sink;boost::shared_ptr< text_sink > sink = boost::make_shared< text_sink >();sink->locked_backend()->add_stream(boost::make_shared< std::ofstream >("full.log"));sink->set_formatter(fmt);boost::log::core::get()->add_sink(sink);sink = boost::make_shared< text_sink >();sink->locked_backend()->add_stream(boost::make_shared< std::ofstream >("important.log"));sink->set_formatter(fmt);sink->set_filter(severity >= warning || (boost::log::expressions::has_attr(tag_attr) && tag_attr == "IMPORTANT_MESSAGE"));boost::log::core::get()->add_sink(sink);// Add attributesboost::log::add_common_attributes();}void logging_function(){boost::log::sources::severity_logger< severity_level > slg;BOOST_LOG_SEV(slg, normal) << "A regular message";BOOST_LOG_SEV(slg, warning) << "Something bad is going on but I can handle it";BOOST_LOG_SEV(slg, critical) << "Everything crumbles, shoot me now!";{BOOST_LOG_SCOPED_THREAD_TAG("Tag", "IMPORTANT_MESSAGE");BOOST_LOG_SEV(slg, normal) << "An important message";}}int main(int, char*[]){init();logging_function();return 0;}
bool my_filter(boost::log::value_ref< severity_level, tag::severity > const& level,boost::log::value_ref< std::string, tag::tag_attr > const& tag){return level >= warning || tag == "IMPORTANT_MESSAGE";}void init(){// ...sink->set_filter(boost::phoenix::bind(&my_filter, severity.or_none(), tag_attr.or_none()));// ...}
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原文地址：http://www.cnblogs.com/zhangpanyi/p/7e4aac5ba6977981d5760da703ffdc37.html
