chromium/third_party/one_euro_filter/src/low_pass_filter.h

#ifndef ONE_EURO_LOW_PASS_FILTER_H_
#define ONE_EURO_LOW_PASS_FILTER_H_

#include <iostream>

namespace one_euro_filter {

class LowPassFilter { … };

}  // namespace one_euro_filter

#endif  // ONE_EURO_LOW_PASS_FILTER_H_