...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::icl::total_enricher
// In header: <boost/icl/map.hpp> struct total_enricher { enum @9 { absorbs_identities = = false }; enum @10 { is_total = = true }; };