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

C++ Array Tuple Size

The C++ function std::tuple_size(std::array) returns the total number of elements present in the container.

Following is the declaration for std::tuple_size(std::array) function form std::array header.

template< class T, size_t N >
class tuple_size< array<T, N> > :
   public integral_constant&lg;size_t, N>
{ };

T − type for which the tuple size is obtained.

The following example shows the usage of std::tuple_size(std::array) function.

#include <iostream>
#include <array>

using namespace std;

int main(void) {

   typedef array<int, 4> arr;

   cout << "Size = " << tuple_size<arr>::value << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Size = 4

array.htm

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