Time.hh

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/*
 * Copyright 2011 Nate Koenig
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
*/
/* Desc: External interfaces for Gazebo
 * Author: Nate Koenig
 * Date: 03 Apr 2007
 */

#ifndef TIME_HH
#define TIME_HH

#include <stdlib.h>
#include <time.h>
#include <iostream>

namespace gazebo
{
  namespace common
  {

    class Time
    {
      public: Time();

      public: Time(const Time &_time);

      public: Time(const struct timeval &_tv);

      public: Time(const struct timespec &_tv);

      public: Time(int32_t _sec, int32_t _nsec);

      public: Time(double _time);

      public: virtual ~Time();

      public: static const Time &GetWallTime();

      public: void SetToWallTime();

      public: void Set(int32_t _sec, int32_t _nsec);

      public: void Set(double _seconds);

      public: double Double() const;

      public: float Float() const;

      public: static Time MSleep(unsigned int _ms);

      public: static Time NSleep(unsigned int _ns);

      public: static Time NSleep(Time _time);

      public: Time &operator =(const struct timeval &tv);

      public: Time &operator =(const struct timespec &tv);

      public: Time &operator =(const Time &time);

      public: Time operator +(const struct timeval &tv) const;

      public: Time operator +(const struct timespec &tv) const;

      public: const Time &operator +=(const struct timeval &tv);

      public: const Time &operator +=(const struct timespec &tv);

      public: Time operator +(const Time &time) const;

      public: const Time &operator +=(const Time &time);

      public: Time operator -(const struct timeval &tv) const;

      public: const Time &operator -=(const struct timeval &tv);

      public: Time operator -(const struct timespec &tv) const;

      public: const Time &operator -=(const struct timespec &tv);

      public: Time operator -(const Time &time) const;

      public: const Time &operator -=(const Time &time);

      public: Time operator *(const struct timeval &tv) const;

      public: const Time &operator *=(const struct timeval &tv);

      public: Time operator *(const struct timespec &tv) const;

      public: const Time &operator *=(const struct timespec &tv);

      public: Time operator *(const Time &time) const;

      public: const Time &operator *=(const Time &time);

      public: Time operator /(const struct timeval &tv) const;

      public: const Time &operator /=(const struct timeval &tv);

      public: Time operator /(const struct timespec &tv) const;

      public: const Time &operator /=(const struct timespec &tv);

      public: Time operator /(const Time &time) const;

      public: const Time &operator /=(const Time &time);

      public: bool operator ==(const struct timeval &tv) const;

      public: bool operator ==(const struct timespec &tv) const;

      public: bool operator ==(const Time &time) const;

      public: bool operator ==(double time) const;

      public: bool operator!=(const struct timeval &tv) const;

      public: bool operator!=(const struct timespec &tv) const;

      public: bool operator!=(const Time &time) const;

      public: bool operator!=(double time) const;

      public: bool operator<(const struct timeval &tv) const;

      public: bool operator<(const struct timespec &tv) const;

      public: bool operator<(const Time &time) const;

      public: bool operator<(double time) const;

      public: bool operator<=(const struct timeval &tv) const;

      public: bool operator<=(const struct timespec &tv) const;

      public: bool operator<=(const Time &time) const;

      public: bool operator<=(double time) const;

      public: bool operator>(const struct timeval &tv) const;

      public: bool operator>(const struct timespec &tv) const;

      public: bool operator>(const Time &time) const;

      public: bool operator>(double time) const;

      public: bool operator>=(const struct timeval &tv) const;

      public: bool operator>=(const struct timespec &tv) const;

      public: bool operator>=(const Time &time) const;

      public: bool operator>=(double time) const;

      public: static inline double SecToNano(double _sec)
              { return _sec * 1e-9;}

      public: static inline double MilToNano(double _ms)
              { return _ms * 1e-6;}

      public: static inline double MicToNano(double _ms)
              { return _ms * 1e-3;}

      public: friend std::ostream &operator<<(std::ostream &_out,
                                              const gazebo::common::Time &_time)
              {
                _out << _time.sec << " " << _time.nsec;
                return _out;
              }

      public: friend std::istream &operator>>(std::istream &_in,
                                              gazebo::common::Time &_time)
              {
                // Skip white spaces
                _in.setf(std::ios_base::skipws);
                _in >> _time.sec >> _time.nsec;
                return _in;
              }

      public: int32_t sec;

      public: int32_t nsec;

      private: static Time wallTime;

      private: inline void Correct()
               {
                 // In the case sec and nsec have different signs, normalize
                 while (this->sec > 0 && this->nsec < 0)
                 {
                   this->sec--;
                   this->nsec += 1e9;
                 }
                 while (this->sec < 0 && this->nsec > 0)
                 {
                   this->sec++;
                   this->nsec -= 1e9;
                 }

                 // Make any corrections
                 this->sec += this->nsec / static_cast<int32_t>(1e9);
                 this->nsec = this->nsec % static_cast<int32_t>(1e9);
               }
      private: static struct timespec clock_resolution;
    };
  }
}
#endif