circular_accumulator.h

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#ifndef CIRCULAR_ACCUMULATOR_H
#define CIRCULAR_ACCUMULATOR_H

#include <vector>

namespace fun
{
    template<typename T>
    struct circular_accumulator
    {
        T sum;

        std::vector<T> samples;

        int index;

        int size;

        circular_accumulator(int _size)
        {
            size = _size;
            samples.resize(size);
            index = 0;
            for(int x = 0; x < size; x++) samples[x] = T(0);
            sum = T(0);
        }

    //    circular_accumulator(){}

        void add(T sample)
        {
            if(sample != sample) sample = 0;
            sum -= samples[index];
            sum += sample;
            samples[index++] = sample;
            if(index >= size) index = 0;
        }
    };

}

#endif // CIRCULAR_ACCUMULATOR_H