Method setFull

src/fl/stl/circular_buffer.h:147–147

    void setHead(fl::size h) { mHead = h; }
    void setTail(fl::size t) { mTail = t; }
    void setFull(bool f) { mFull = f; }

  private:
    fl::size increment(fl::size index) const { return (index + 1) % mCapacity; }