...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::date_time::operator<<
// In header: <boost/date_time/int_adapter.hpp> template<typename charT, typename traits, typename int_type> std::basic_ostream< charT, traits > & operator<<(std::basic_ostream< charT, traits > & os, const int_adapter< int_type > & ia);