CPP StopWatch

StopWatch

// Written by Nadav Benedek 2017
class StopWatch {
private:
	double accumulatedTimeSeconds = 0;
	double startTime       = 0;
	enum State {NONE, START, PAUSE, RESUME, STOP};
	State state;
public:

	StopWatch() : accumulatedTimeSeconds(0), startTime(0), state(NONE) {
	}

	// Resets the StopWatch Completely.
	void start() {
		startTime = (double)getTickCount();
		accumulatedTimeSeconds = 0;
		state = START;
	}

	void pause() {
		assert(state == START || state == RESUME);
		accumulatedTimeSeconds += ((double)getTickCount() - startTime) / (getTickFrequency());
		state = PAUSE;
	}

	void resume() {
		assert(state == PAUSE);
		startTime = (double)getTickCount();
		state = RESUME;
	}

	double stop() {
		assert(state == START || state == RESUME);
		accumulatedTimeSeconds += ((double)getTickCount() - startTime) / (getTickFrequency());
		state = STOP;
		return accumulatedTimeSeconds;
	}
};