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#include <iostream>
int sum(const int* arr, size_t size)
{
if (size == 0)
return 0;
return *arr + sum(arr + 1, size - 1);
}
int sum_tail_rec(const int* arr, size_t size, int sum)
{
if (size == 0)
return sum;
return sum_tail_rec(arr + 1, size - 1, sum + *arr);
}
int sum_tail_wrapper(const int* arr, size_t size)
{
return sum_tail_rec(arr, size, 0);
}
int main()
{
const size_t SIZE = 4;
int arr[SIZE] = { 1, 2, 3, 4 };
std::cout << sum_tail_wrapper(arr, SIZE);
}
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