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

C++ Tuple Library - size

It contains the information about tuple size.

Following is the declaration for std::tuple_size.

	
template <class T> class tuple_size;

template <class T> class tuple_size;

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

none

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

The members of both tuple objects are modified.

In below example for std::tuple_size.

#include <iostream>
#include <tuple>

int main () {
   std::tuple<int,int,char,double> mytuple (100,900,'a',3.14);

   std::cout << "tuple has ";
   std::cout << std::tuple_size<decltype(mytuple)>::value;
   std::cout << " elements." << '\n';

   return 0;
}

The output should be like this −

tuple has 4 elements.

tuple.htm

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