How to pass a VLA to a function template?

I have the following code which could not be complied.

using namespace std;
void f(int);
template<typename T1, size_t N>
void array_ini_1d(T1 (&x)[N])
{
  for (int i = 0; i < N; i++)
  {
    x[i] = 0;
  }
}

What is the proper way to pass the array if the main is something like below.

int main()
{
  int a;
  cin >> a;
  int n = a / 4;
  f(n);
  return 0;
}

void f(int n)
{
  int arr[n];
  array_ini_1d(arr);
}

error: no matching function to call to array_ini_1d..............

I don't think the compiler can deduce the size of a variable-length array in a template. Also, don't forget to forward declare f before you use it. Variable-length arrays are a GCC extension and you should get a warning regarding their use.