get_MaterialResolutionEffect.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef get_MaterialResolutionEffect_H
#define get_MaterialResolutionEffect_H
#include <array>
#include <cmath>
#include <cstdlib>
#include <memory>
#include <vector>
#include "AsgMessaging/AsgMessaging.h"

 
class TH1;
class TH2;
class TArrayD;
 
class get_MaterialResolutionEffect : public asg::AsgMessaging {
 
 public:
  get_MaterialResolutionEffect();
  ~get_MaterialResolutionEffect();

  double getDelta(int particle_type, double energy, double eta,
                  int response_type, int isyst) const;
  static double interpolateTH1(TH1* hist, double x, bool abs_bins) ;
  void store_IBL_PP0_YProjections();
  void setInterpolate(bool interpolate) {
    m_interpolate = interpolate;
    store_IBL_PP0_YProjections();
  }
 
 private:
  // histograms to store resolution parameters
  static const int s_nEtaBins = 8;
  static const int s_nSys = 4;
  std::array<std::array<std::array<std::unique_ptr<TH1>, 3>, s_nEtaBins>, s_nSys> m_hSystPeak;
  std::array<std::array<std::array<std::unique_ptr<TH1>, 3>, s_nEtaBins>, s_nSys> m_hSystResol;
  std::array<std::unique_ptr<TH2>, 3> m_hsyst_IBL_PP0;
  // each of the m_hsyst_IBL_PP0 is a TH2 with 11 eta bins on x-axis, in case of doing interpolation: 
  // we will need the Y-projection for each eta bins
  std::array<std::vector<std::unique_ptr<TH1>>, 3> m_hsyst_IBL_PP0_ProjectionY;
  bool m_interpolate = false;
  const TArrayD* m_etBins;  // A xistogram will own this
};
 
#endif