...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::typeindex::hash_value
// In header: <boost/type_index/type_index_facade.hpp> template<typename Derived, typename TypeInfo> std::size_t hash_value(const type_index_facade< Derived, TypeInfo > & lhs);