boost log

#include <boost/log/common.hpp>  

#include <boost/log/expressions.hpp>  

#include <boost/log/utility/setup/file.hpp>  

#include <boost/log/utility/setup/console.hpp>  

#include <boost/log/utility/setup/common_attributes.hpp>  

#include <boost/log/attributes/timer.hpp>  

#include <boost/log/attributes/named_scope.hpp>  

#include <boost/log/sources/logger.hpp>  

#include <boost/log/support/date_time.hpp>

namespace logging = boost::log;

namespace sinks = boost::log::sinks;

namespace attrs = boost::log::attributes;

namespace src = boost::log::sources;

namespace expr = boost::log::expressions;

namespace keywords = boost::log::keywords;

using boost::shared_ptr;

enum severity_level

{

    normal,

    notification,

    warning,

    error,

    critical

};

// The formatting logic for the severity level  

template< typename CharT, typename TraitsT >

inline std::basic_ostream< CharT, TraitsT >& operator<< (

    std::basic_ostream< CharT, TraitsT >& strm, severity_level lvl)

{

    static const char* const str[] =

    {

        "normal",

        "notification",

        "warning",

        "error",

        "critical"

    };

    if (static_cast<std::size_t>(lvl) < (sizeof(str) / sizeof(*str)))

        strm << str[lvl];

    else

        strm << static_cast<int>(lvl);

    return strm;

}

void TestBoostLog()

{

    logging::add_console_log(std::clog, keywords::format = "%TimeStamp%: %Message%");

    // One can also use lambda expressions to setup filters and formatters  

    logging::add_file_log

        (

        "sample.log",

        keywords::filter = expr::attr< severity_level >("Severity") >= normal,

        keywords::format = expr::stream

        << expr::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d, %H:%M:%S.%f")

        << " [" << expr::format_date_time< attrs::timer::value_type >("Uptime", "%O:%M:%S")

        << "] [" << expr::format_named_scope("Scope", keywords::format = "%n (%f:%l)")

        << "] <" << expr::attr< severity_level >("Severity")

        << "> " << expr::message

        /*

        keywords::format = expr::format("%1% [%2%] [%3%] <%4%> %5%")

        % expr::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d, %H:%M:%S.%f")

        % expr::format_date_time< attrs::timer::value_type >("Uptime", "%O:%M:%S")

        % expr::format_named_scope("Scope", keywords::format = "%n (%f:%l)")

        % expr::attr< severity_level >("Severity")

        % expr::message

        */

        );

    // Also let's add some commonly used attributes, like timestamp and record counter.  

    logging::add_common_attributes();

    logging::core::get()->add_thread_attribute("Scope", attrs::named_scope());

    BOOST_LOG_FUNCTION();

    // Now our logs will be written both to the console and to the file.  

    // Let's do a quick test and output something. We have to create a logger for this.  

    src::logger lg;

    // And output...  

    BOOST_LOG(lg) << "Hello, World!";

    // Now, let's try logging with severity  

    src::severity_logger< severity_level > slg;

    // Let's pretend we also want to profile our code, so add a special timer attribute.  

    slg.add_attribute("Uptime", attrs::timer());

    BOOST_LOG_SEV(slg, normal) << "A normal severity message, will not pass to the file";

    BOOST_LOG_SEV(slg, warning) << "A warning severity message, will pass to the file";

    BOOST_LOG_SEV(slg, error) << "An error severity message, will pass to the file";

    

    /*

    //#include <boost/log/trivial.hpp>

    cout << "hello, world" << endl;

    BOOST_LOG_TRIVIAL(trace) << "A trace severity message";

    BOOST_LOG_TRIVIAL(debug) << "A debug severity message";

    BOOST_LOG_TRIVIAL(info) << "An informational severity message";

    BOOST_LOG_TRIVIAL(warning) << "A warning severity message";

    BOOST_LOG_TRIVIAL(error) << "An error severity message";

    BOOST_LOG_TRIVIAL(fatal) << "A fatal severity message";

    */

}