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    #ifndef PUWeight_H
    #define PUWeight_H
   
    #include <string>
    #include <vector>
   
    #include "TH1.h"
    #include "TString.h"
   
    // Compute pile-up weights to match data distribtution
    class PUWeight {
    public:
      enum Scenario { Summer12S10 };
   
      static Scenario toScenario(const std::string& str);
      static std::string toString(const Scenario sc);
   
      // Constructor. Initializes default behaviour to return PU weight of 1
      PUWeight();
   
      // Initialise weights for a given MC pile-up scenario. Can only be
      // called once.
      void initPUWeights(const TString& nameOfDataDistribution, const PUWeight::Scenario sc) {
    	initPUWeights( std::string( nameOfDataDistribution.Data() ), sc );
      }
      void initPUWeights(const std::string& nameOfDataDistribution, const PUWeight::Scenario sc);
   
      // Get weight factor dependent on number of added PU interactions
      // nPU is the 'true' number of interactions as explained in
      // https://twiki.cern.ch/twiki/bin/viewauth/CMS/PileupJSONFileforData#2012_Pileup_JSON_Files
      double getPUWeight(const int nPU) const;
   
   
    private:
      bool isInit_;
      int nPUMax_;
      std::vector<double> puWeigths_;
   
      // Generate weights for given data PU distribution
      std::vector<double> generateWeights(const Scenario sc, const TH1* data_npu_estimated) const;
    };
   
    #endif //PUWeight_H

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