Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2022. The current version is 1.89.0.
BOOST_LOG_STREAM — The macro writes a record to the log.
// In header: <boost/log/sources/record_ostream.hpp>
BOOST_LOG_STREAM(logger)