clcg32.h

//==========================================================================
//  CLCG32.CC - part of
//                 OMNeT++/OMNEST
//              Discrete System Simulation in C++
//
//==========================================================================

/*--------------------------------------------------------------*
  Copyright (C) 2002-2017 Andras Varga
  Copyright (C) 2006-2017 OpenSim Ltd.

  This file is distributed WITHOUT ANY WARRANTY. See the file
  `license' for details on this and other legal matters.
*--------------------------------------------------------------*/

#ifndef __OMNETPP_CLCG32_H
#define __OMNETPP_CLCG32_H

#include "simkerneldefs.h"
#include "globals.h"
#include "crng.h"
#include "cconfiguration.h"

namespace omnetpp {


#define LCG32_MAX  0x7ffffffeL  /* = 2^31-2 */

class SIM_API cLCG32 : public cRNG
{
  protected:
    long seed;

    // 256 pre-generated seeds, spaced 8,388,608 values in the sequence.
    // This covers the whole RNG period. Enough for 128 runs with 2 RNGs
    // each, or 64 runs with 4 RNGs each -- assuming one run never uses
    // more than 8 million random numbers per RNG.
    static long autoSeeds[256];

  public:
    cLCG32() {}
    virtual ~cLCG32() {}

    virtual void initialize(int seedSet, int rngId, int numRngs,
                            int parsimProcId, int parsimNumPartitions,
                            cConfiguration *cfg) override;

    virtual void selfTest() override;

    virtual unsigned long intRand() override;

    virtual unsigned long intRandMax() override;

    virtual unsigned long intRand(unsigned long n) override;

    virtual double doubleRand() override;

    virtual double doubleRandNonz() override;

    virtual double doubleRandIncl1() override;
};

}  // namespace omnetpp


#endif