std::tuple_element< __i, _Tp > - Gives the type of the ith element of a given tuple type.

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                                                    libstdc++               std::tuple_element<__i,_Tp>(3cxx)

template<size_t__i,typename_Tp>
       struct std::tuple_element< __i, _Tp >"Gives the type of the ith element of a given tuple type.

       std::tuple_element< __i, _Tp > - Gives the type of the ith element of a given tuple type.