...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_absorber
// In header: <boost/icl/map.hpp> struct total_absorber { enum @7 { absorbs_identities = = true }; enum @8 { is_total = = true }; };