/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/CommonTools/ParticleFlow/interface/PFCandidateFwdPtrFactory.h

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#ifndef CommonTools_ParticleFlow_PFCandidateFwdPtrFactory_h
#define CommonTools_ParticleFlow_PFCandidateFwdPtrFactory_h

#include "DataFormats/ParticleFlowCandidate/interface/PFCandidate.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidateFwd.h"

namespace reco {
  class PFCandidateFwdPtrFactory : public std::binary_function<edm::FwdPtr<reco::PFCandidate>, edm::View<reco::PFCandidate>, unsigned int > {
  public :
    edm::FwdPtr<reco::PFCandidate> operator() (edm::View<reco::PFCandidate> const & view, unsigned int i)  const  { 
      edm::Ptr<reco::PFCandidate> ptr = view.ptrAt(i);
      edm::Ptr<reco::PFCandidate> backPtr = ptr;
      if ( ptr.isNonnull() && ptr.isAvailable() && ptr->numberOfSourceCandidatePtrs() > 0 ) {
        edm::Ptr<reco::Candidate> basePtr = ptr->sourceCandidatePtr(0);
        if (basePtr.isNonnull() && basePtr.isAvailable())
          backPtr = edm::Ptr<reco::PFCandidate>( basePtr );//this cast works only for available stuff
      }
      return edm::FwdPtr<reco::PFCandidate>(ptr,backPtr); 
    }

  };
}

#endif