nstime.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2005,2006 INRIA
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
#ifndef TIME_H
#define TIME_H

#include "assert.h"
#include "attribute.h"
#include "attribute-helper.h"
#include "int64x64.h"
#include <stdint.h>
#include <math.h>
#include <ostream>

namespace ns3 {

class Time
{
public:
  enum Unit
  {
    S  = 0,
    MS = 1,
    US = 2,
    NS = 3,
    PS = 4,
    FS = 5,
    LAST = 6
  };

  inline Time &operator = (const Time &o)
  {
    m_data = o.m_data;
    return *this;
  }
  inline Time ()
    : m_data ()
  {}
  inline Time(const Time &o)
    : m_data (o.m_data)
  {}
  explicit inline Time (double v)
    : m_data (lround (v))
  {}
  explicit inline Time (int v)
    : m_data (v)
  {}
  explicit inline Time (long int v)
    : m_data (v)
  {}
  explicit inline Time (long long int v)
    : m_data (v)
  {}
  explicit inline Time (unsigned int v)
    : m_data (v)
  {}
  explicit inline Time (unsigned long int v)
    : m_data (v)
  {}
  explicit inline Time (unsigned long long int v)
    : m_data (v)
  {}

  explicit Time (const std::string & s);

  inline bool IsZero (void) const
  {
    return m_data == 0;
  }
  inline bool IsNegative (void) const
  {
    return m_data <= 0;
  }
  inline bool IsPositive (void) const
  {
    return m_data >= 0;
  }
  inline bool IsStrictlyNegative (void) const
  {
    return m_data < 0;
  }
  inline bool IsStrictlyPositive (void) const
  {
    return m_data > 0;
  }

  inline int Compare (const Time &o) const
  {
    return (m_data < o.m_data) ? -1 : (m_data == o.m_data) ? 0 : 1;
  }

  inline double GetSeconds (void) const
  {
    return ToDouble (Time::S);
  }

  inline int64_t GetMilliSeconds (void) const
  {
    return ToInteger (Time::MS);
  }
  inline int64_t GetMicroSeconds (void) const
  {
    return ToInteger (Time::US);
  }
  inline int64_t GetNanoSeconds (void) const
  {
    return ToInteger (Time::NS);
  }
  inline int64_t GetPicoSeconds (void) const
  {
    return ToInteger (Time::PS);
  }
  inline int64_t GetFemtoSeconds (void) const
  {
    return ToInteger (Time::FS);
  }
  inline int64_t GetTimeStep (void) const
  {
    return m_data;
  }
  inline double GetDouble (void) const
  {
    return m_data;
  }
  inline int64_t GetInteger (void) const
  {
    return GetTimeStep ();
  }


  static void SetResolution (enum Unit resolution);
  static enum Unit GetResolution (void);
  inline static Time FromInteger (uint64_t value, enum Unit timeUnit)
  {
    struct Information *info = PeekInformation (timeUnit);
    if (info->fromMul)
      {
        value *= info->factor;
      }
    else
      {
        value /= info->factor;
      }
    return Time (value);
  }
  inline int64_t ToInteger (enum Unit timeUnit) const
  {
    struct Information *info = PeekInformation (timeUnit);
    int64_t v = m_data;
    if (info->toMul)
      {
        v *= info->factor;
      }
    else
      {
        v /= info->factor; 
      }
    return v;
  }
  inline static Time FromDouble (double value, enum Unit timeUnit)
  {
    return From (int64x64_t (value), timeUnit);
  }
  inline double ToDouble (enum Unit timeUnit) const
  {
    return To (timeUnit).GetDouble ();
  }
  static inline Time From (const int64x64_t &from, enum Unit timeUnit)
  {
    struct Information *info = PeekInformation (timeUnit);
    // DO NOT REMOVE this temporary variable. It's here
    // to work around a compiler bug in gcc 3.4
    int64x64_t retval = from; 
    if (info->fromMul)
      {
        retval *= info->timeFrom;
      }
    else
      {
        retval.MulByInvert (info->timeFrom);
      }
    return Time (retval);
  }
  inline int64x64_t To (enum Unit timeUnit) const
  {
    struct Information *info = PeekInformation (timeUnit);
    int64x64_t retval = int64x64_t (m_data);
    if (info->toMul)
      {
        retval *= info->timeTo;
      }
    else
      {
        retval.MulByInvert (info->timeTo);
      }
    return retval;
  }
  inline operator int64x64_t () const
  {
    return int64x64_t (m_data);
  }
  explicit inline Time (const int64x64_t &value)
    : m_data (value.GetHigh ())
  {}
  inline static Time From (const int64x64_t &value)
  {
    return Time (value);
  }

private:
  struct Information
  {
    bool toMul;
    bool fromMul;
    uint64_t factor;
    int64x64_t timeTo;
    int64x64_t timeFrom;
  };
  struct Resolution
  {
    struct Information info[LAST];
    enum Time::Unit unit;
  };

  static inline struct Resolution *PeekResolution (void)
  {
    static struct Time::Resolution resolution = GetNsResolution ();
    return &resolution;
  }
  static inline struct Information *PeekInformation (enum Unit timeUnit)
  {
    return &(PeekResolution ()->info[timeUnit]);
  }

  static struct Resolution GetNsResolution (void);
  static void SetResolution (enum Unit unit, struct Resolution *resolution);

  friend bool operator == (const Time &lhs, const Time &rhs);
  friend bool operator != (const Time &lhs, const Time &rhs);
  friend bool operator <= (const Time &lhs, const Time &rhs);
  friend bool operator >= (const Time &lhs, const Time &rhs);
  friend bool operator < (const Time &lhs, const Time &rhs);
  friend bool operator > (const Time &lhs, const Time &rhs);
  friend Time operator + (const Time &lhs, const Time &rhs);
  friend Time operator - (const Time &lhs, const Time &rhs);
  friend Time &operator += (Time &lhs, const Time &rhs);
  friend Time &operator -= (Time &lhs, const Time &rhs);
  friend Time Abs (const Time &time);
  friend Time Max (const Time &ta, const Time &tb);
  friend Time Min (const Time &ta, const Time &tb);

  int64_t m_data;
};

inline bool
operator == (const Time &lhs, const Time &rhs)
{
  return lhs.m_data == rhs.m_data;
}
inline bool
operator != (const Time &lhs, const Time &rhs)
{
  return lhs.m_data != rhs.m_data;
}
inline bool
operator <= (const Time &lhs, const Time &rhs)
{
  return lhs.m_data <= rhs.m_data;
}
inline bool
operator >= (const Time &lhs, const Time &rhs)
{
  return lhs.m_data >= rhs.m_data;
}
inline bool
operator < (const Time &lhs, const Time &rhs)
{
  return lhs.m_data < rhs.m_data;
}
inline bool
operator > (const Time &lhs, const Time &rhs)
{
  return lhs.m_data > rhs.m_data;
}
inline Time operator + (const Time &lhs, const Time &rhs)
{
  return Time (lhs.m_data + rhs.m_data);
}
inline Time operator - (const Time &lhs, const Time &rhs)
{
  return Time (lhs.m_data - rhs.m_data);
}
inline Time &operator += (Time &lhs, const Time &rhs)
{
  lhs.m_data += rhs.m_data;
  return lhs;
}
inline Time &operator -= (Time &lhs, const Time &rhs)
{
  lhs.m_data -= rhs.m_data;
  return lhs;
}

inline Time Abs (const Time &time)
{
  return Time ((time.m_data < 0) ? -time.m_data : time.m_data);
}
inline Time Max (const Time &ta, const Time &tb)
{
  return Time ((ta.m_data < tb.m_data) ? tb : ta);
}
inline Time Min (const Time &ta, const Time &tb)
{
  return Time ((ta.m_data > tb.m_data) ? tb : ta);
}


std::ostream& operator<< (std::ostream& os, const Time & time);
std::istream& operator>> (std::istream& is, Time & time);

inline Time Seconds (double seconds)
{
  return Time::FromDouble (seconds, Time::S);
}

inline Time MilliSeconds (uint64_t ms)
{
  return Time::FromInteger (ms, Time::MS);
}
inline Time MicroSeconds (uint64_t us)
{
  return Time::FromInteger (us, Time::US);
}
inline Time NanoSeconds (uint64_t ns)
{
  return Time::FromInteger (ns, Time::NS);
}
inline Time PicoSeconds (uint64_t ps)
{
  return Time::FromInteger (ps, Time::PS);
}
inline Time FemtoSeconds (uint64_t fs)
{
  return Time::FromInteger (fs, Time::FS);
}


inline Time Seconds (int64x64_t seconds)
{
  return Time::From (seconds, Time::S);
}
inline Time MilliSeconds (int64x64_t ms)
{
  return Time::From (ms, Time::MS);
}
inline Time MicroSeconds (int64x64_t us)
{
  return Time::From (us, Time::US);
}
inline Time NanoSeconds (int64x64_t ns)
{
  return Time::From (ns, Time::NS);
}
inline Time PicoSeconds (int64x64_t ps)
{
  return Time::From (ps, Time::PS);
}
inline Time FemtoSeconds (int64x64_t fs)
{
  return Time::From (fs, Time::FS);
}

// internal function not publicly documented
inline Time TimeStep (uint64_t ts)
{
  return Time (ts);
}

ATTRIBUTE_VALUE_DEFINE (Time);
ATTRIBUTE_ACCESSOR_DEFINE (Time);
ATTRIBUTE_CHECKER_DEFINE (Time);

} // namespace ns3

#endif /* TIME_H */