arduino Tinylab buttons handling in a debounce style

Arduino Tinylab Debounce Buttons

// This example code is based on http://www.arduino.cc/en/Tutorial/Debounce

boolean debug = true;
long debounceDelay = 50;

class LEDButton{    
  public:
  int buttonPin = 0;
  int buttonState = 0;
  int lastButtonState = LOW;
  int ledPin = 0;
  int ledState = HIGH;
  long lastDebounceTime = 0;

  void CheckPush(){
    int reading = digitalRead(this->buttonPin);

    if (reading != this->lastButtonState) {
      this->lastDebounceTime = millis();
    }
  
    if ((millis() - this->lastDebounceTime) > debounceDelay) {
      // whatever the reading is at, it's been there for longer
      // than the debounce delay, so take it as the actual current state:
  
      // if the button state has changed:
      if (this->buttonState != reading) {

        if (debug && this->buttonPin == A5){
          Serial.println("reading");
          Serial.println(reading);
        }
        
        this->buttonState = reading;
  
        // only toggle the LED if the new button state is HIGH
        if (this->buttonState == HIGH) {
          ChangeLEDState(!this->ledState);
        }
      }
    }
  
    this->lastButtonState = reading;  
  }

  void Init(){
    pinMode(this->buttonPin, INPUT);
    pinMode(this->ledPin, OUTPUT);
    
    digitalWrite(this->ledPin, this->ledState);    
  }

  private:

  void ChangeLEDState(int newState){
    digitalWrite(this->ledPin, newState);
    this->ledState = newState;
  }

  
};


LEDButton* b1;
LEDButton* b2;
LEDButton* b3;
LEDButton* b4;

LEDButton* createButton(int buttonPin, int buttonState, int lastButtonState, int ledPin, int ledState){
  LEDButton* b = new LEDButton();
  b->buttonPin = buttonPin;
  b->buttonState = buttonState;
  b->lastButtonState = lastButtonState;
  b->ledPin = ledPin;
  b->ledState = ledState;
  return b;
}

void setupButtons(){
  b1 = createButton(9, 0, LOW, 13, HIGH);
  b2 = createButton(8, 0, LOW, 12, HIGH);
  b3 = createButton(A5, 0, LOW, 11, HIGH);
  b4 = createButton(A5, 0, HIGH, 10, LOW);

  b1->Init();
  b2->Init();
  b3->Init();
  b4->Init();
}

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

  setupButtons();
}

void loop() {
  b1->CheckPush();
  b2->CheckPush();
  b3->CheckPush();
  b4->CheckPush();
}