average.h

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/*
 * Copyright (c) 2014, ATR, Atsushi Watanabe
 * Copyright (c) 2014-2018, the neonavigation authors
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the copyright holder nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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#ifndef TRAJECTORY_TRACKER_AVERAGE_H
#define TRAJECTORY_TRACKER_AVERAGE_H

namespace trajectory_tracker
{
template <typename T>
class Average
{
public:
  inline Average()
    : sum()
    , num(0)
  {
  }
  inline void operator+=(const T& val)
  {
    sum += val;
    num++;
  }
  inline operator T() const
  {
    if (num == 0)
      return 0;
    return sum / num;
  }

private:
  T sum;
  int num;
};
}  // namespace trajectory_tracker

#endif  // TRAJECTORY_TRACKER_AVERAGE_H