...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::binding_of
// In header: <boost/type_erasure/binding_of.hpp> template<typename Concept, typename T> const binding< Concept > & binding_of(const any< Concept, T > & arg);