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 2024. The current version is 1.90.0.
boost::log::operator<<
// In header: <boost/log/utility/manipulators/auto_newline.hpp> template<typename CharT, typename TraitsT, typename AllocatorT> basic_formatting_ostream< CharT, TraitsT, AllocatorT > & operator<<(basic_formatting_ostream< CharT, TraitsT, AllocatorT > & strm, auto_newline_manip);