...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::container::dtl::get_small_vector_opt<void>
// In header: <boost/container/small_vector.hpp> struct get_small_vector_opt<void> { // types typedef small_vector_null_opt type; };