36933     struct tuple_element<__i, const _Tp>  struct
36935       typedef typename add_const<__tuple_element_t<__i, _Tp>>::type type;
36939     struct tuple_element<__i, volatile _Tp>  struct
36941       typedef typename add_volatile<__tuple_element_t<__i, _Tp>>::type type;
36945     struct tuple_element<__i, const volatile _Tp>  struct
36947       typedef typename add_cv<__tuple_element_t<__i, _Tp>>::type type;
36975     struct tuple_element<0, std::pair<_Tp1, _Tp2>>  struct
36976     { typedef _Tp1 type; };
36980     struct tuple_element<1, std::pair<_Tp1, _Tp2>>  struct
36981     { typedef _Tp2 type; };
44262     struct tuple_element<_Int, std::array<_Tp, _Nm>>  struct
44265       typedef _Tp type;
54016     struct tuple_element<__i, tuple<_Head, _Tail...> >  struct
54023     struct tuple_element<0, tuple<_Head, _Tail...> >  struct
54025       typedef _Head type;