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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);

  std::ostream& operator<<( std::ostream& out, 
                            const reco::GenParticleRef& genRef );

}

#endif

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