class SevenIndicator
{
  public:
    SevenIndicator(int initValue, int *pins)
    {
      _curValue = initValue;
      for (int i = 0; i < _kSegmentsCount; ++i)
      {
        pinMode(pins[i], OUTPUT);
        digitalWrite(pins[i], HIGH);
      }
      _pins = pins;
      showValue();
    }
    ~SevenIndicator() = default;

    void stepUp()
    {
      ++_curValue;
      if (_curValue >= _kMaxValue)
      {
        _curValue = 0;
      }
      showValue();
    }

  private:
  int _curValue;
  int *_pins;
  const int _kSegmentsCount = 7;
  static const int _kMaxValue = 16;
  uint8_t _segmentsCoding[_kMaxValue] = 
  {
  0b11000000, //0
  0b11111001, //1
  0b10100100, //2
  0b10110000, //3
  0b10011001, //4
  0b10010010, //5
  0b10000010, //6
  0b11111000, //7
  0b10000000, //8
  0b10010000, //9
  0b10001000, //A
  0b10000011, //b
  0b11000110, //C
  0b10100001, //d
  0b10000110, //E
  0b10001110, //F
  };

  showValue()
  {
    for(int i = 0; i < _kSegmentsCount; ++i)
    {
      int enable = bitRead(_segmentsCoding[_curValue], i);
      digitalWrite(_pins[i], enable);
    }
  }
};

template<typename T>
class Button
{
public:
  Button(T* indicator, void (T::*action)(void), int pinB)
  {
    _indicator = indicator;
    _action =action;
    _lastButton = LOW;
    _curButton = LOW;
    _pinButton = pinB;
    pinMode(pinB, INPUT_PULLUP);
  }

  ~Button() = default;

  void process()
  {
    _curButton = debounce();
    if (_lastButton == HIGH && _curButton == LOW)
    {
      (_indicator->*_action)();
    }
    _lastButton = _curButton;
  }

private:
  T* _indicator;
  void (T::*_action)(void);
  int _lastButton;
  int _curButton;
  int _pinButton;

  int debounce ()
  {
    int current = digitalRead(_pinButton);
    if(_lastButton != current)
    {
      delay(5);
      current = digitalRead(_pinButton);
    }
    return current;
  }
};

int pins[7] = {0,1,2,3,4,5,6};
SevenIndicator indicator(0, pins);
Button<SevenIndicator> button(&indicator, &SevenIndicator::stepUp, 7);


void setup() 
{ 
  
}

void loop() 
{
  button.process();
}