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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_tuple_element.htm below:

C++ Tuple Element

It contains the information about tuple element type.

Following is the declaration for std::tuple_element.

	
template <size_t I, class T> class tuple_element;

template <size_t I, class T> class tuple_element;

• t − It contains type for which the tuple size is obtained.

• I − It contains an order number of element within the tuple.

none

No-throw guarantee − this member function never throws exceptions.

The members of both tuple objects are modified.

In below example for std::tuple_element.

#include <iostream>
#include <tuple>

int main () {
   auto mytuple = std::make_tuple (100,'x');

   std::tuple_element<0,decltype(mytuple)>::type first = std::get<0>(mytuple);
   std::tuple_element<1,decltype(mytuple)>::type second = std::get<1>(mytuple);

   std::cout << "tuple contains: " << first << " and " << second << '\n';

   return 0;
}

The output should be like this −

tuple contains: 100 and x

tuple.htm

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