Just a quick thought that came to my mind...
Did you consider using the syntax 'BOOST_LOG(dbg, "message" << foobar);' instead of 'BOOST_LOG(dbg) << "message" << foobar;'?
While I think the syntax you use looks far nicer, we ususally need the ability to be able to compile away the logging calls completely and this only can be done with the first form.
a point considered in detail in "Effecient C++" by Bulka & Mayhew
Unfortunately I have not read their book. Just curious, what was their conclusion? (also, note my other post to Markus) Best, John -- John Torjo, Contributing editor, C/C++ Users Journal -- "Win32 GUI Generics" -- generics & GUI do mix, after all -- http://www.torjo.com/win32gui/ -- v1.5 - tooltips at your fingertips (work for menus too!) + bitmap buttons (work for MessageBox too!) + tab dialogs, hyper links, lite html