[boost] [log] More questions for Andrey (how to add function signature to messages)

From: Boris (boriss_at_[hidden])
Date: 2008-08-20 08:10:21

Currently I'm writing messages to a file with:

BOOST_LOG(mylogger) << __FUNCSIG__ << " message text";

I'd prefer if the function signature (let's assume for now that the macro  
is supported by all compilers) is written automatically without me having  
to add __FUNCSIG__ everywhere. From what I understand I can't simply add  
an attribute to the logger as __FUNCSIG__ would then be used in another  
function (and thus a different function signature would be written).

Looking around in the documentation I found BOOST_LOG_WITH_PARAMS (see  
http://boost-log.sourceforge.net/libs/log/doc/html/BOOST_LOG_WITH_PARAMS.html).  
It makes me think that I could define my own BOOST_LOG macro somehow like  
this:

#define BOOST_LOG_FUNCSIG(logger)\
     BOOST_LOG_WITH_PARAMS((logger),  
(::boost::log::sources::keywords::funcsignature = (__FUNCSIG__)))

I see that the macro BOOST_LOG_SEV is defined similarly in  
severity_logger.hpp. However I also see that some more code has to be  
added to the logger to make the logger understand what to do with the  
keyword. For example in the severity logger in open_record() the  
appropriate attribute is set if the severity keyword is found. That means  
I would need to create a new logger and check for my new funcsignature  
attribute in open_record() if I want the function signature to be written  
automatically? Is there another way to do this more easily?

Boris