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

Function template operator<<

boost::log::trivial::operator<< — Outputs stringized representation of the severity level to the stream.

Synopsis

// In header: <boost/log/trivial.hpp>


template<typename CharT, typename TraitsT> 
  std::basic_ostream< CharT, TraitsT > & 
  operator<<(std::basic_ostream< CharT, TraitsT > & strm, severity_level lvl);