class Thread {
public:
  unsigned long refreshTime;
  void setTask(void (*_task)());
  void thread();
  void setRefreshTime(unsigned long *_time){
    refreshTime = _time;
  }

private:
  void (*userTask)();
  unsigned int lastTime = 0;

  class test{

  };

};

void Thread::setTask(void (*_task)()){
  userTask = _task;
}
/*
void Thread::setRefreshTime(){
  userTask = _task;
}
*/
void Thread::thread(){
  if((millis() - lastTime) >= refreshTime){
    userTask();
    lastTime = millis();
  }
}

const byte LED_PIN = 2, LED2_PIN = 3;

Thread blinkLED, blinkLED2;

void _blinkLED (){
  digitalWrite(LED_PIN, !digitalRead(LED_PIN));
  //delay(200);
}

void _blinkLED2 (){
  digitalWrite(LED2_PIN, !digitalRead(LED2_PIN));
  //delay(500);
}

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);
  pinMode(LED2_PIN, OUTPUT);
  digitalWrite(LED2_PIN, LOW);

  unsigned long n = 300, n2 = 500;

  blinkLED.setTask(&_blinkLED);
  blinkLED2.setTask(&_blinkLED2);
  
  blinkLED2.setRefreshTime(n2);
  blinkLED.setRefreshTime(n);

}

void loop() {
  // put your main code here, to run repeatedly:
  blinkLED.thread();
  blinkLED2.thread();

}