moving_average.h

#pragma once
#include <vector>

class Filter {
public:
  virtual void add_entry(double n) = 0;
  virtual double get_value() const = 0;
};

class MovingAverage : public Filter {
public:
  MovingAverage(int buffer_size);
  MovingAverage(int buffer_size, double starting_value);

  void add_entry(double n) override;

  double get_value() const override;

  int get_size() const;
 
private:
  int buffer_index;           // index of the next value to be overridden
  std::vector<double> buffer; // all current data readings we've taken
  double current_avg;         // the current value of the data
};

class ExponentialMovingAverage : public Filter {
public:
  ExponentialMovingAverage(int buffer_size);
  ExponentialMovingAverage(int buffer_size, double starting_value);

  void add_entry(double n) override;

  double get_value() const override;

  int get_size();
 
private:
  int buffer_index;           // index of the next value to be overridden
  std::vector<double> buffer; // all current data readings we've taken
  double current_avg;         // the current value of the data
};