Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Type definition tuple_element_t

tuple_element_t — Type of a field with index I in simple aggregate T.

// In header: <boost/pfr/core.hpp>


typedef typename tuple_element< I, T >::type tuple_element_t;

Example:

std::vector< boost::pfr::tuple_element_t<0, my_structure> > v;