GenParticlesHelper.h

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#ifndef PhysicsTools_HepMCCandAlgos_GenParticlesHelper_h
#define PhysicsTools_HepMCCandAlgos_GenParticlesHelper_h

#include "DataFormats/HepMCCandidate/interface/GenParticleFwd.h"

#include <iostream>

namespace GenParticlesHelper {

  typedef reco::GenParticleCollection::const_iterator IG;
  typedef reco::GenParticleRefVector::const_iterator IGR;

  void findParticles(const reco::GenParticleCollection& sourceParticles,
                     reco::GenParticleRefVector& particleRefs,
                     int pdgId,
                     int status);

  void findDescendents(const reco::GenParticleRef& base,
                       reco::GenParticleRefVector& descendents,
                       int status,
                       int pdgId = 0);

  void findSisters(const reco::GenParticleRef& baseSister, reco::GenParticleRefVector& sisterRefs);

  bool hasAncestor(const reco::GenParticle* particle, int pdgId, int status);

  bool isDirect(const reco::GenParticleRef& particle);
}  // namespace GenParticlesHelper

namespace edm {
  std::ostream& operator<<(std::ostream& out, const reco::GenParticleRef& genRef);
}
#endif