boost log

#include <boost/log/trivial.hpp>
#include <boost/log/core.hpp> //配置可选级别
#include <boost/log/expressions.hpp> //配置可选级别
#include <boost/log/utility/setup/file.hpp> //写入文件
#include <iostream>

void init()
{
        boost::log::add_file_log("sample.log");
        boost::log::core::get()->set_filter(boost::log::trivial::severity >= boost::log::trivial::info);
}

int main()
{
        init();
        try
        {
                BOOST_LOG_TRIVIAL(trace)<<"A trace msaage";
                BOOST_LOG_TRIVIAL(debug)<<"A debug msaage";
                BOOST_LOG_TRIVIAL(info)<<"A informational msaage";
                BOOST_LOG_TRIVIAL(warning)<<"A warning msaage";
                BOOST_LOG_TRIVIAL(error)<<"A error msaage";
                BOOST_LOG_TRIVIAL(fatal)<<"A fatal msaage";
        }
        catch(std::exception &e)
        {
                std::cout<<"Exception:"<<e.what()<<std::endl;
        }
        return 0;
}