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 "EvtPatches.hh"
 
#include "EvtRandom.hh"
#include "EvtRandomEngine.hh"
#include "EvtReport.hh"
#include <iostream>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
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(); }