RollingAvgFilter.h

#pragma once
 
#include <iterator>
#include <list>
#include <numeric>
 
namespace filters {

template <typename T> class RollingAvgFilter {
public:
    explicit RollingAvgFilter(size_t numPoints)
        : numPoints(numPoints), data() {}

    T get() const {
        return std::reduce(std::next(data.begin()), data.end(), data.front()) / data.size();
    }

    T get(const T& val) {
        data.push_back(val);
        if (data.size() > numPoints) {
            data.pop_front();
        }
 
        return get();
    }

    void reset() {
        data.clear();
    }

    int getSize() const {
        return data.size();
    }

    int getBufferSize() const {
        return numPoints;
    }

    std::list<T> getData() const {
        return data;
    }
 
private:
    size_t numPoints;
    std::list<T> data;
};
 
} // namespace filters