/data/refman/pasoursint/CMSSW_4_4_5_patch3/src/ElectroWeakAnalysis/ZEE/interface/UniqueElectrons.h

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std::vector<reco::GsfElectronRef> uniqueElectronFinder(edm::Handle<reco::GsfElectronCollection>& pElectrons)
{
        const reco::GsfElectronCollection *electrons = pElectrons.product();
        //Remove duplicate electrons which share a supercluster
        std::vector<reco::GsfElectronRef> UniqueElectrons;
        int index =0;
        for(reco::GsfElectronCollection::const_iterator elec = electrons->begin(); elec != electrons->end();++elec)
        {
                const reco::GsfElectronRef electronRef(pElectrons, index);
                reco::GsfElectronCollection::const_iterator BestDuplicate = elec;
                for(reco::GsfElectronCollection::const_iterator elec2 = electrons->begin(); elec2 != electrons->end(); ++elec2)
                {
                    if(elec != elec2)
                    {
                        if(elec->superCluster() == elec2->superCluster())
                        {
                            edm::LogDebug_("", "MySelection.cc", 122)<<"e/p Best duplicate = "<< BestDuplicate->eSuperClusterOverP()
                                                                                         <<"\telec2 = "<<elec2->eSuperClusterOverP();
                            if(fabs(BestDuplicate->eSuperClusterOverP()-1.) >= fabs(elec2->eSuperClusterOverP()-1.))
                            {
                                    BestDuplicate = elec2;
                                    edm::LogDebug_("", "MySelection.cc", 122)<<"elec2 is now best duplicate";
                            }else edm::LogDebug_("", "MySelection.cc", 122)<<"BestDuplicate remains best duplicate";
                         }
                    }
                 }
                 if(BestDuplicate == elec) UniqueElectrons.push_back(electronRef);
                 ++index;
        }       
        return UniqueElectrons;
}