gistfile1.c

class ShiftRegister {
public:
	ShiftRegister(uint8_t dataPin, uint8_t latchPin, uint8_t clockPin) {
		pinMode(dataPin, OUTPUT);
		pinMode(clockPin, OUTPUT);
		pinMode(latchPin, OUTPUT);
	}
	void write()
	{
		// turn off output
		digitalWrite(latchPin, LOW);

		// send states
		shiftOut(dataPin, clockPin, MSBFIRST, state);

		// turn on output
		digitalWrite(latchPin, HIGH);
	}
	void set(uint8_t pin, uint8_t pinState, bool now=true)
	{
		bitWrite(state, pin, pinState);
		if (now) {
			write();
		}
	}
	void clear()
	{
		state = 0;
		write();
	}

private:
	byte state;
	uint8_t dataPin, latchPin, clockPin;
};

ShiftRegister shiftRegister(8, 9, 10);