Merger.h

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#ifndef UtilAlgos_Merger_h
#define UtilAlgos_Merger_h

#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "DataFormats/Common/interface/CloneTrait.h"
#include <vector>

template<typename InputCollection, 
     typename OutputCollection = InputCollection,
     typename P = typename edm::clonehelper::CloneTrait<InputCollection>::type>
class Merger : public edm::EDProducer {
public:
  explicit Merger( const edm::ParameterSet& );
  ~Merger();

private:
  virtual void produce( edm::Event&, const edm::EventSetup&) override;
  typedef std::vector<edm::InputTag> vtag;
  vtag src_;
};

template<typename InputCollection, typename OutputCollection, typename P>
Merger<InputCollection, OutputCollection, P>::Merger( const edm::ParameterSet& par ) : 
  src_( par.template getParameter<vtag>( "src" ) ) {
  produces<OutputCollection>();
}

template<typename InputCollection, typename OutputCollection, typename P>
Merger<InputCollection, OutputCollection, P>::~Merger() {
}

template<typename InputCollection, typename OutputCollection, typename P>
void Merger<InputCollection, OutputCollection, P>::produce( edm::Event& evt, const edm::EventSetup&) {
  std::auto_ptr<OutputCollection> coll( new OutputCollection );
  for( vtag::const_iterator s = src_.begin(); s != src_.end(); ++ s ) {
    edm::Handle<InputCollection> h;
    evt.getByLabel( * s, h );
    for( typename InputCollection::const_iterator c = h->begin(); c != h->end(); ++c ) {
      coll->push_back( P::clone( * c ) );
    }
  }
  evt.put( coll );
}

#endif