/data/refman/pasoursint/CMSSW_5_3_4/src/SimDataFormats/HiGenData/src/GenHIEvent.cc

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#include "SimDataFormats/HiGenData/interface/GenHIEvent.h"
using namespace edm;

void GenHIEvent::setGenParticles(const reco::GenParticleCollection* input) const {
  subevents_.reserve(nhard_);
  for(int i = 0; i < nhard_; ++i){
    std::vector<reco::GenParticleRef> refs;
    subevents_.push_back(refs);
  }

  for(unsigned int i = 0; i < input->size(); ++i){
    reco::GenParticleRef ref(input,i);
    subevents_[ref->collisionId()].push_back(ref);
  }
}

const std::vector<reco::GenParticleRef> GenHIEvent::getSubEvent(unsigned int sub_id) const {

  if(sub_id > subevents_.size()){ // sub_id >= 0, since sub_id is unsigned
  }

  return subevents_[sub_id];
}