tuple_element_t 166 uspace/lib/cpp/include/__bits/tuple/tuple.hpp using tuple_element_t = typename tuple_element<I, T>::type; tuple_element_t 170 uspace/lib/cpp/include/__bits/utility/utility.hpp using tuple_element_t = typename tuple_element<I, T>::type; tuple_element_t 377 uspace/lib/cpp/include/__bits/utility/utility.hpp using tuple_element_t = typename tuple_element<I, T>::type;HelenOS homepage, sources at GitHub