BesEvtGen-00-04-08/src/EvtGen/EvtGenBase/EvtRandom.cc

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//--------------------------------------------------------------------------
//
// 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: EvtRandom.cc
//
// Description: routines to get random numbers from 
//              random number generator.
//
// Modification history:
//
//    DJL/RYD   September 25, 1996           Module created
//
//------------------------------------------------------------------------
//
#include "EvtGenBase/EvtPatches.hh"
 
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <iostream>
#include "EvtGenBase/EvtRandomEngine.hh"
#include "EvtGenBase/EvtRandom.hh"
#include "EvtGenBase/EvtReport.hh"
using std::endl;
 
 
EvtRandomEngine* EvtRandom::_randomEngine=0;
 
void EvtRandom::setRandomEngine(EvtRandomEngine* randomEngine){
  _randomEngine=randomEngine;
}
 
 
double EvtRandom::random(){
 
  if (_randomEngine==0){
    report(ERROR,"EvtGen") <<"No random engine available in "
               <<"EvtRandom::random()."<<endl;
    ::abort();
  }
 
  double rdm= _randomEngine->random();
  //  std::cout<<"EvtRandom::Flat= "<<rdm<<std::endl;
  return rdm;
}
 
 
// Random number routine to generate numbers between
// min and max.  By djl on July 27, 1995.
double EvtRandom::Flat( double min, double max){
 
  if ( min > max ) {
    report(ERROR,"EvtGen") << "min>max in EvtRandom::Flat(" << min << "," << max << ")" <<endl;
    ::abort();
  }
 
  return EvtRandom::random()*( max - min )+min;
 
} 
 
double EvtRandom::Flat(double max){
 
  return max*EvtRandom::random();
 
} 
 
double EvtRandom::Flat(){
 
  return EvtRandom::random();
 
}