...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
BOOST_LOG_STREAM_WITH_PARAMS — The macro writes a record to the log and allows to pass additional named arguments to the logger.
// In header: <boost/log/sources/record_ostream.hpp>
BOOST_LOG_STREAM_WITH_PARAMS(logger, params_seq)