sim.h

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#ifndef LARDATAOBJ_SIMULATION_SIM_H
#define LARDATAOBJ_SIMULATION_SIM_H

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

namespace sim {

  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 sim::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);
}

#endif // LARDATAOBJ_SIMULATION_SIM_H