#ifndef AVERAGE_H
#define AVERAGE_H

#include "../../Assertions.h"

namespace Stats {

	template <typename Scalar> class Average {

	private:

		int cnt;
		Scalar sum;

	public:

		/** ctor */
		Average() : cnt(0), sum() {
			;
		}

		/** contains a valid average? */
		bool isValid() const {
			return cnt > 0;
		}

		/** add a new value */
		void add(const Scalar val) {
			sum += val;
			++cnt;
		}

		/** get the current value */
		Scalar get() const {
			Assert::isNot0(cnt, "add() values first!");
			return sum / cnt;
		}

	};

}

#endif // AVERAGE_H