...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::map::on_definedness<Type, false>
// In header: <boost/icl/map.hpp> template<typename Type> struct on_definedness<Type, false> { // public static functions static void add_intersection(Type &, const Type &, const element_type &); };