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[u/mrichter/AliRoot.git] / HIJING / AliHijingRndm.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

//-----------------------------------------------------------------------------
//   Class: AliHijingRndm
//   Random Number Interface to Fortran (FINCTION RLU_HIJING from HIJING)
//   Since AliGenHijing belongs to another module (THijing) one cannot
//   pass the ponter to the generator via static variable
//   Author:
//-----------------------------------------------------------------------------

#include <TError.h>

#include "AliHijingRndm.h"

TRandom * AliHijingRndm::fgHijingRandom=0;

ClassImp(AliHijingRndm)

//_______________________________________________________________________
AliHijingRndm::AliHijingRndm()
{
  // 
  // Default ctor
  //
}

//_______________________________________________________________________
AliHijingRndm::AliHijingRndm(const AliHijingRndm& rn)
{
  //
  // Copy constructor
  //
  rn.Copy(*this);
}

//_______________________________________________________________________
AliHijingRndm::~AliHijingRndm() {
  //
  // Destructor
  //
  fgHijingRandom=0;
}

//_______________________________________________________________________
void AliHijingRndm::Copy(AliHijingRndm&) const
{
  //
  // No copy is allowed
  //
  ::Fatal("Copy","Not implemented\n");
}

//_______________________________________________________________________
void AliHijingRndm::SetHijingRandom(TRandom *ran) {
  //
  // Sets the pointer to an existing random numbers generator
  //
  if(ran) fgHijingRandom=ran;
  else fgHijingRandom=gRandom;
}

//_______________________________________________________________________
TRandom * AliHijingRndm::GetHijingRandom() {
  //
  // Retrieves the pointer to the random numbers generator
  //
  return fgHijingRandom;
}

//_______________________________________________________________________
# define rluget_hijing rluget_hijing_
# define rluset_hijing rluset_hijing_
# define rlu_hijing    rlu_hijing_

extern "C" {
  void rluget_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
  {printf("Dummy version of rluget_hijing reached\n");}

  void rluset_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
  {printf("Dummy version of rluset_hijing reached\n");}

  Double_t rlu_hijing(Int_t & /*idum*/) 
  {
    // Wrapper to FINCTION RLU_HIJING from HIJING
    // Uses static method to retrieve the pointer to the (C++) generator
      Double_t r;
      do r=AliHijingRndm::GetHijingRandom()->Rndm(); 
      while(0 >= r || r >= 1);
      return r;
  }
}