Fill a static c-array with loop unroll support

FillArray.cpp

// view the assembly output in https://goo.gl/VEyRNK or https://gcc.godbolt.org/#
#include <iostream>

using namespace std;

struct Array
{
  	template<typename T, int N>
    struct Elem
    {
        static inline void set (T* array, T&& val)
        {
            array[N] = val;
            Elem<T, N-1>::set (array, (T&&)val);
        }

        static inline void set (T* array, T val)
        {
            array[N] = val;
            Elem<T, N-1>::set (array, val);
        }
    };

    template<typename T>
    struct Elem<T, 0>
    {
        static inline void set (T* array, T&& val)
        {
            array[0] = val;
        }

        static inline void set (T* array, T val)
        {
            array[0] = val;
        }
    };
  
    template<typename T, int N>
    static void fill (T (&array)[N], T&& val)
    {
        Elem<T, N-1>::set ((T*)array, val);
    }

    template<typename T, int N>
    static int countof (T (&array)[N])
    {
        return N;
    }
};

int main()
{
    int array[10];
   
    Array::fill (array, 4321);
    for (int i = 0; i < Array::countof (array); ++i)
        cout << array[i] << ", ";
    
    cout << endl; 
    return 0;
}