CandReducer.cc

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#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "DataFormats/Candidate/interface/Candidate.h"

class CandReducer : public edm::EDProducer {
public:
  explicit CandReducer( const edm::ParameterSet& );
  ~CandReducer();
private:
  void produce( edm::Event& evt, const edm::EventSetup& ) override;
  edm::EDGetTokenT<reco::CandidateView> srcToken_;
};

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/Candidate/interface/LeafCandidate.h"
#include "FWCore/Utilities/interface/EDMException.h"

using namespace reco;
using namespace edm;

CandReducer::CandReducer( const edm::ParameterSet& cfg ) :
  srcToken_( consumes<reco::CandidateView>(cfg.getParameter<edm::InputTag>("src") ) ) {
  produces<CandidateCollection>();
}

CandReducer::~CandReducer() {
}

void CandReducer::produce( Event& evt, const EventSetup& ) {
  Handle<reco::CandidateView> cands;
  evt.getByToken( srcToken_, cands );
  std::auto_ptr<CandidateCollection> comp( new CandidateCollection );
  for( reco::CandidateView::const_iterator c = cands->begin(); c != cands->end(); ++c ) {
    std::auto_ptr<Candidate> cand( new LeafCandidate( * c ) );
    comp->push_back( cand.release() );
  }
  evt.put( comp );
}

#include "FWCore/Framework/interface/MakerMacros.h"

DEFINE_FWK_MODULE( CandReducer );