...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::type_erasure::get
// In header: <boost/type_erasure/tuple.hpp> template<int N, typename Concept, class... T> any< Concept, TN > & get(tuple< Concept, T... > & arg); template<int N, typename Concept, class... T> const any< Concept, TN > & get(const tuple< Concept, T... > & arg);