McEventWeight.h

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
// 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