sinks::event_log::event_composer composer(
        sinks::event_log::direct_event_id_mapping<int>("EventId")
    );
 
    composer[MSG1] % expr::attr<WORD>("Tag1");
    composer[MSG2] % expr::attr<DWORD>("Tag2");
    composer[MSG3] % expr::attr<std::string>("Tag3");

    backend->set_event_composer(composer);

Unfortunately event log entries in event viewer are incomplete - i.e. there are still "%n" 

placeholders instead of their values. From what I have found while inspecting the code 
with debugger it seems that event_map_reference& operator% (FormatterT const& fmt)
is never hit - so m_EventMap in composer is empty. I added a method that works the same way 
as mentioned operator:


            template< typename FormatterT >
            event_map_reference& add_formatter(FormatterT const &fmt)
            {
                m_Composer = m_Owner.add_formatter(m_ID, m_Composer, formatter_type(fmt));
                return *this;
            }

 and call it explicitly, so the code looks like that:

    composer[MSG1].add_formatter(expr::attr<WORD>("Tag1"));
    composer[MSG2].add_formatter(expr::attr<DWORD>("Tag2"));
    composer[MSG3].add_formatter(expr::attr<std::string>("Tag3"));

Now m_EventMap has three items - and I get empty strings instead of "%n" in event viewer. 

I pass the tag values with boost macro, i.e.:

    BOOST_LOG_SCOPED_THREAD_TAG("Tag3", std::string("value"));

I am using Visual Studio 2010 compiler. Any ideas?

Regards,

Konrad.