...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_invertible<Type, true>
// In header: <boost/icl/map.hpp> template<typename Type> struct on_invertible<Type, true> { // types typedef Type::element_type element_type; typedef Type::inverse_codomain_combine inverse_codomain_combine; // public static functions static void subtract(Type &, const element_type &); };