...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::local_time::dst_not_valid
// In header: <boost/date_time/local_time/local_date_time.hpp> struct dst_not_valid { // construct/copy/destruct dst_not_valid(std::string const & = std::string()); };