fastest_no_ostr_like.cpp

This usage:

• Fastest. It does not use formatters and destinations (thus, the flexibility that comes with formatters/destinations) is gone
• You have one filter, which can be turned on or off
• You have 2 loggers: app and err.
• The app writes to console, the err writes to "err.txt" file
• the output is "dump" - no usage of << operator

Here's what the output will be:

The console:

this is so cool
hello, world
good to be back ;)

The err.txt file:

first error 
second error 

#define BOOST_LOG_COMPILE_FAST_OFF
#include <boost/logging/logging.hpp>
#include <boost/logging/format.hpp>

using namespace boost::logging;

struct no_gather {
    typedef const char* msg_type ;
    const char * m_msg;
    no_gather() : m_msg(0) {}
    const char * msg() const { return m_msg; }
    void *out(const char* msg) { m_msg = msg; return this; }
    void *out(const std::string& msg) { m_msg = msg.c_str(); return this; }
};


typedef logger< no_gather, destination::cout > app_log_type;
typedef logger< no_gather, destination::file > err_log_type;

BOOST_DEFINE_LOG_FILTER(g_log_filter, filter::no_ts ) 

BOOST_DEFINE_LOG(g_log_app, app_log_type)
BOOST_DEFINE_LOG_WITH_ARGS( g_log_err, err_log_type, ("err.txt") )

#define LAPP_ BOOST_LOG_USE_SIMPLE_LOG_IF_FILTER(g_log_app(), g_log_filter()->is_enabled() ) 
#define LERR_ BOOST_LOG_USE_SIMPLE_LOG_IF_FILTER(g_log_err(), g_log_filter()->is_enabled() ) 

void fastest_no_ostr_like_example() {
    g_log_app()->mark_as_initialized();
    g_log_err()->mark_as_initialized();

    LAPP_("this is so cool\n");
    LERR_("first error \n");

    std::string hello = "hello", world = "world";
    LAPP_(hello + ", " + world + "\n");

    g_log_filter()->set_enabled(false);
    LAPP_("this will not be written to the log");
    LAPP_("this won't be written to the log");
    LERR_("this error is not logged ");

    g_log_filter()->set_enabled(true);
    LAPP_("good to be back ;) \n" );
    LERR_("second error \n" );
}




int main() {
    fastest_no_ostr_like_example();
}


// End of file

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Copyright John Torjo © 2007
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