TRandom1.h

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// @(#)root/mathcore:$Id$
// Author: Rene Brun   04/03/99
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_TRandom1
#define ROOT_TRandom1
 
 
 
//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TRandom1                                                             //
//                                                                      //
// Ranlux random number generator class (periodicity > 10**14)          //
//                                                                      //
//////////////////////////////////////////////////////////////////////////
 
#include "TRandom.h"
 
class TRandom1 : public TRandom {
 
protected:
  Int_t           fNskip;
  Int_t           fLuxury;
  Int_t           fIlag;
  Int_t           fJlag;
  Int_t           fCount24;
  Float_t         fFloatSeedTable[24];
  Float_t         fCarry;
  const Int_t     fIntModulus;
  static Int_t    fgNumEngines;
  static Int_t    fgMaxIndex;
  const UInt_t   *fTheSeeds;           //! Temporary array of seed values (transient)
  const Double_t  fMantissaBit24;
  const Double_t  fMantissaBit12;
 
public:
   TRandom1();
   TRandom1(UInt_t seed, Int_t lux = 3);
   TRandom1(Int_t rowIndex, Int_t colIndex, Int_t lux);
   ~TRandom1() override;
   /////////////////////////////////////////////////////////////////////////////
   /// Returns current luxury value.
   virtual Int_t GetLuxury() const {return fLuxury;}
   /////////////////////////////////////////////////////////////////////////////
   /// Returns the current seed (first element of the seed table)
   /// \warning This is not the initial seed!
   UInt_t GetSeed() const override { return  UInt_t ( fFloatSeedTable[0] /  fMantissaBit24 ) ; }
   /////////////////////////////////////////////////////////////////////////////
   /// Returns the pointer to the current seeds array.
   const UInt_t *GetTheSeeds() const {return fTheSeeds;}
   /////////////////////////////////////////////////////////////////////////////
   /// Returns an array of seed values stored in the table, given the index.
   static void GetTableSeeds(UInt_t *seeds, Int_t index);
   using TRandom::Rndm;
   Double_t Rndm() override;
   void RndmArray(Int_t size, Float_t *vect) override;
   void RndmArray(Int_t size, Double_t *vect) override;
   virtual void SetSeed2(UInt_t seed, Int_t lux = 3);
   // Sets the state of the algorithm according to seed.
   virtual void SetSeeds(const UInt_t *seeds, Int_t lux = 3);
   // Sets the state of the algorithm according to the zero terminated
   // array of seeds. Only the first seed is used.
   void SetSeed(ULong_t seed) override;
 
   ClassDefOverride(TRandom1,2)  //Ranlux Random number generators with periodicity > 10**14
};
 
R__EXTERN TRandom *gRandom;
 
#endif