/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

//

//  Copyright (C) 2001  Pierre L'Ecuyer (lecuyer@iro.umontreal.ca)

//

// 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

//

// Modified for ns-3 by: Rajib Bhattacharjea<raj.b@gatech.edu>

#ifndef RNGSTREAM_H

#define RNGSTREAM_H

#include <string>

#include <stdint.h>

namespace ns3 {

/**

 * \ingroup core

 * \ingroup randomvariable 

 *

 * \brief Combined Multiple-Recursive Generator MRG32k3a

 *

 * This class is the combined multiple-recursive random number

 * generator called MRG32k3a.  The ns3::RandomVariableBase class

 * holds a static instance of this class.  The details of this

 * class are explained in:  

 * http://www.iro.umontreal.ca/~lecuyer/myftp/papers/streams00.pdf

 */

class RngStream {

public:  //public api

  RngStream ();

  RngStream (const RngStream&);

  void InitializeStream(); // Separate initialization

  void ResetStartStream ();

  void ResetStartSubstream ();

  void ResetNextSubstream ();

  void ResetNthSubstream(uint32_t N);

  void SetAntithetic (bool a);

  void IncreasedPrecis (bool incp);

  bool SetSeeds (const uint32_t seed[6]);

  void AdvanceState (int32_t e, int32_t c);

  void GetState (uint32_t seed[6]) const;

  double RandU01 ();

  int32_t RandInt (int32_t i, int32_t j);

public: //public static api

  static bool SetPackageSeed (const uint32_t seed[6]);

  static bool CheckSeed(const uint32_t seed[6]);

private: //members

  double Cg[6], Bg[6], Ig[6];

  bool anti, incPrec;

  double U01 ();

  double U01d ();

private: //static data

  static double nextSeed[6];

};

} //namespace ns3

#endif