#pragma once
#include <vector>
#include <memory>
#include "lasp_types.h"
#include "lasp_mathtypes.h"
/**
 * @brief Filter used to pre-filter a double-precision floating point data
 * stream.
 */
class Filter {
public:
  /**
   * @brief Filter input, and provides output in same array as input
   *
   * @param inout Vector of input / output samples. 
   */
  virtual void filter(vd &inout) = 0;
  virtual ~Filter() = 0;
  /**
   * @brief Reset filter state to 0 (history was all-zero).
   */
  virtual void reset() = 0;

  /**
   * @brief Clone a filter, to generate a copy.
   *
   * @return Copy of filter with state set to zero.
   */
  virtual std::unique_ptr<Filter> clone() const = 0;
};


inline Filter::~Filter() {}