...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_DECLARE_LOGGER_TYPE — The macro declares a logger class that inherits a number of base classes.
// In header: <boost/log/sources/basic_logger.hpp>
BOOST_LOG_DECLARE_LOGGER_TYPE(type_name, char_type, base_seq, threading)