how to use boost log from multiple files with Gloa - boost

Question

I am trying to create a Global Logger within my entire application so I can use
src::severity_logger_mt< >& lg = my_logger::get();
to get the global logger for different classes (resided in different files) logging.
I try to follow the example listed in boost.org (as listed below). But does not seems to work. Did anyone know any example I can follow or what I need to do make if works. Thanks.
http://www.boost.org/doc/libs/1_54_0/libs/log/doc/html/log/detailed/sources.html
BOOST_LOG_GLOBAL_LOGGER(my_logger, src::severity_logger_mt)
// my_logger.h
// ===========
#include "my_logger.h"
BOOST_LOG_GLOBAL_LOGGER_INIT(my_logger, src::severity_logger_mt)
{
src::severity_logger_mt< > lg;
lg.add_attribute("StopWatch", boost::make_shared< attrs::timer >());
return lg;
}
// my_logger.cpp
// ===========
#include "my_logger.h"
BOOST_LOG_GLOBAL_LOGGER_INIT(my_logger, src::severity_logger_mt)
{
src::severity_logger_mt< > lg;
lg.add_attribute("StopWatch", boost::make_shared< attrs::timer >());
return lg;
}

Answer 1

I've just managed to get this working myself
Logging.h
#pragma once
#include <boost/log/expressions.hpp>
#include <boost/log/sources/global_logger_storage.hpp>
#include <boost/log/support/date_time.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/utility/setup.hpp>
#define INFO BOOST_LOG_SEV(my_logger::get(), boost::log::trivial::info)
#define WARN BOOST_LOG_SEV(my_logger::get(), boost::log::trivial::warning)
#define ERROR BOOST_LOG_SEV(my_logger::get(), boost::log::trivial::error)
#define SYS_LOGFILE "/var/log/example.log"
//Narrow-char thread-safe logger.
typedef boost::log::sources::severity_logger_mt<boost::log::trivial::severity_level> logger_t;
//declares a global logger with a custom initialization
BOOST_LOG_GLOBAL_LOGGER(my_logger, logger_t)
Logging.cpp
#include "Logging.h"
namespace attrs = boost::log::attributes;
namespace expr = boost::log::expressions;
namespace logging = boost::log;
//Defines a global logger initialization routine
BOOST_LOG_GLOBAL_LOGGER_INIT(my_logger, logger_t)
{
logger_t lg;
logging::add_common_attributes();
logging::add_file_log(
boost::log::keywords::file_name = SYS_LOGFILE,
boost::log::keywords::format = (
expr::stream << expr::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d %H:%M:%S")
<< " [" << expr::attr< boost::log::trivial::severity_level >("Severity") << "]: "
<< expr::smessage
)
);
logging::add_console_log(
std::cout,
boost::log::keywords::format = (
expr::stream << expr::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d %H:%M:%S")
<< " [" << expr::attr< boost::log::trivial::severity_level >("Severity") << "]: "
<< expr::smessage
)
);
logging::core::get()->set_filter
(
logging::trivial::severity >= logging::trivial::info
);
return lg;
}
main.c
#include "Logging.h"
int main(int argc, char **argv)
{
INFO << "Program started";
return 0;
}
My build settings
AM_LDFLAGS += -lboost_system -lboost_thread -lpthread
AM_LDFLAGS += -DBOOST_LOG_DYN_LINK -lboost_log_setup -lboost_log
AM_CXXFLAGS += -std=c++11 -DBOOST_LOG_DYN_LINK