...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::operator<<
// In header: <boost/log/attributes/attribute_name.hpp> template<typename CharT, typename TraitsT> std::basic_ostream< CharT, TraitsT > & operator<<(std::basic_ostream< CharT, TraitsT > & strm, attribute_name const & name);