File content as of revision 2:5d429be7d0aa:

/*
 * Software License Agreement (BSD License)
 *
 * Copyright (c) 2011, Willow Garage, Inc.
 * 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 Willow Garage, Inc. nor the names of its
 *    contributors may be used to endorse or promote prducts 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 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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 */

#include "ros/time.h"

namespace ros
{
void normalizeSecNSec(uint32_t& sec, uint32_t& nsec)
{
  uint32_t nsec_part = nsec % 1000000000UL;
  uint32_t sec_part = nsec / 1000000000UL;
  sec += sec_part;
  nsec = nsec_part;
}

Time& Time::fromNSec(int32_t t)
{
  sec = t / 1000000000;
  nsec = t % 1000000000;
  normalizeSecNSec(sec, nsec);
  return *this;
}

Time& Time::operator +=(const Duration &rhs)
{
  sec += rhs.sec;
  nsec += rhs.nsec;
  normalizeSecNSec(sec, nsec);
  return *this;
}

Time& Time::operator -=(const Duration &rhs)
{
  sec += -rhs.sec;
  nsec += -rhs.nsec;
  normalizeSecNSec(sec, nsec);
  return *this;
}
}