EvtSimpleRandomEngine.hh

//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtGen/EvtRandom.hh
//
// Description:Class to generate random numbers. Single member
//             function random is expected to return a random
//             number in the range ]0..1[.
//
// Modification history:
//
//    RYD     December 25, 1999         Module created
//
//------------------------------------------------------------------------

#ifndef EVTSIMPLERANDOMENGINE_HH
#define EVTSIMPLERANDOMENGINE_HH

#include "PspGen/EvtRandomEngine.hh"

class EvtSimpleRandomEngine : public EvtRandomEngine
{

public:

  EvtSimpleRandomEngine(){
    _next = 1;
    _seed = 1;
  }
  
  EvtSimpleRandomEngine(unsigned long int seed){
    _next = seed;
    _seed = seed;
  }
  
  virtual void reset() {
    _next = _seed;
  }
  
  virtual double random();
  
private:
  
  unsigned long int _next;
  unsigned long int _seed;
  
};

#endif