...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::indeterminate_name — A locale facet specifying the name of the indeterminate value of a tribool.
// In header: <boost/logic/tribool_io.hpp> template<typename CharT> class indeterminate_name : public facet, private noncopyable { public: // types typedef CharT char_type; typedef std::basic_string< CharT > string_type; // construct/copy/destruct indeterminate_name(); explicit indeterminate_name(const string_type &); // public member functions string_type name() const; // public data members static std::locale::id id; // Uniquily identifies this facet with the locale. };