struct Timeout {
  unsigned long timeout;
  unsigned long time;
  bool set = false;
};

template <size_t n>
class Delay {
  Timeout timeouts_[n];

public:
  bool run(size_t const, unsigned long const);
};


template <size_t n>
bool Delay<n>::run(size_t const id, unsigned long const timeout) {
  if (not timeouts_[id].set) {
    timeouts_[id].timeout = timeout;
    timeouts_[id].time = millis();
    timeouts_[id].set = true;
    return false;
  }
  if (millis() - timeouts_[id].time < timeouts_[id].timeout) {
    return false;
  }
  timeouts_[id].set = false;
  return true;
}

Delay<2> delayer;


void setup() {
  Serial.begin(9600);
}

void loop() {
  if (delayer.run(0, 1000)) {
    Serial.println("Every second.");
  }
  if (delayer.run(1, 2000)) {
    Serial.println("Every two seconds.");
  }
}