...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::logic::get_default_indeterminate_name — Returns a string containing the default name for the indeterminate value of a tribool with the given character type T.
// In header: <boost/logic/tribool_io.hpp> template<typename T> std::basic_string< T > get_default_indeterminate_name();