/cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/ReweightUtils/ReweightUtils/McEventWeight.h

// Get the mcEventWeight with index #McEventWeightIndex from
// EventInfo
//
// Author: Olivier Arnaez <olivier.arnaez@cern.ch>

#ifndef MCEVENTWEIGHT_H
#define MCEVENTWEIGHT_H 1

// Include the base class
#include "ReweightUtils/WeightToolBase.h"


class McEventWeight : public WeightToolBase
  {
    ASG_TOOL_CLASS2( McEventWeight, IWeightTool, IObservableTool )

   public:
    McEventWeight( const std::string& name );

    virtual ~McEventWeight() {};

    virtual double evaluate( const xAOD::IParticle* part ) const override;

    virtual double getWeight() const override;


   private:
    //internal function "computing" the weight
    double computeWeight(const xAOD::EventInfo*) const;

    unsigned int m_McEventWeightIndex;

    std::string m_eventInfoName;
    bool m_useTruthEvents = false;

};

#endif //> !MCEVENTWEIGHT_H

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