WeightManager.h

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#ifndef Validation_EventGenerator_WeightManager
#define Validation_EventGenerator_WeightManager

// Utility class, that computes the event weight,
// either returning the weight as stored in the HepMCCollection
// or returning the product of the weights stored in
// a vector of GenEventInfoProducts

#include "FWCore/Utilities/interface/InputTag.h"
#include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
#include "SimDataFormats/GeneratorProducts/interface/GenEventInfoProduct.h"

#include "FWCore/Framework/interface/ConsumesCollector.h"
#include <vector>

namespace edm {
  class ParameterSet;
  class Event;
}  // namespace edm

class WeightManager {
public:
  WeightManager(const edm::ParameterSet&, edm::ConsumesCollector iC);
  ~WeightManager(){};

  double weight(const edm::Event&);
  std::vector<std::vector<double>> weightsCollection(const edm::Event&);

private:
  bool _useHepMC;
  std::vector<edm::InputTag> _genEventInfos;
  edm::InputTag _hepmcCollection;

  edm::EDGetTokenT<edm::HepMCProduct> hepmcCollectionToken_;
  std::vector<edm::EDGetTokenT<GenEventInfoProduct>> genEventInfosTokens_;
};

#endif