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

tuple_element — tuple_element has a member typedef type that returns the type of a field with index I in simple aggregate T.

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


typedef unspecified tuple_element;

Example:

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