Hi, By 'clean-up functions' I mean destructors or automatic objects, destructors of static objects, functions registered with std::atexit and std::terminate. So, what I want to ask is: Can I use Boost.Log for logging inside destructors of automatic objects? Destructors are exected not to throw by STL containers and algorithms, also it is often taught that a destructor throwing during stack unwinding ... Can the logging throw an exception? I guess it cn, and I guess, it my be unsafe to log in the destructor. Am I right? Can I use Boost.Log in functions that are run after function main finishes? I.e. can I safely log in destructors of static objects, or functions registered with std::atexit? Similarly, can I log in the std::terminate (if I have installed my custom handler)? When are log sources or sinks destroyed? Regards, &rzej