sim.h

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/// \file sim.h
///
/// \brief Tools and modules for checking out the basics of the Monte Carlo
///
/// \author brebel@fnal.gov
///
/// \version $Id: sim.h,v 1.6 2009/10/05 23:22:58 t962cvs Exp $
///
/// Coding note: Never put '#include "sim.h"' in your code. It would
/// force a dependency in your class on every other class in the
/// Simulation directory; e.g., if I changed the MCTruth code, your
/// code that generates Electrons would re-compile.  This class exists
/// solely as a bookkeeping tool.

#ifndef SIM_H
#define SIM_H

#include <limits>
#include "TRandom3.h"

///Monte Carlo sdpulation
namespace gar {
  namespace sdp{
    
    unsigned int GetRandomNumberSeed();
    
    // any track id method returns sim::Particle:NoParticleId, it means the
    // associated particle was too low-energy to be written by the
    // detector Monte Carlo.
    static const int NoParticleId = std::numeric_limits<int>::min();
    
  }
  
  inline unsigned int sdp::GetRandomNumberSeed(){
    
    // the maximum allowed seed for the ::art::RandomNumberGenerator
    // is 900000000. Use TRandom3 to get the seed value in that range.
    // Instantiating TRandom3 with a 0 means that its seed is set based
    // on the TUUID and should always be random, even for jobs running on the
    // same machine
    TRandom3 rand(0);
    return rand.Integer(900000000);
  }
}// gar

#endif// SIM_H