Tricky C++ code

using namespace std;const int FIRST_TIME = 1;template <typename T>void func (T & ){ static int var; ++var; if (FIRST_TIME == var)  cout << "Printed once." << endl;  else   cout << "Printed more than once." << endl;}int main(void){ int a1[4]; int a2[5]; func (a1); func (a1);}