...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::unit_element_based_inplace_combine
// In header: <boost/icl/functors.hpp> template<typename Type> struct unit_element_based_inplace_combine { // public static functions static Type identity_element(); };