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

#ifndef APWeightHist_h
#define APWeightHist_h
#include "TH1D.h"
#include <string>

class APWeightEntry;
class TGraphErrors;
class TGraphAsymmErrors;

class APWeightHist : public TH1D {

public:
  APWeightHist(const char *name,const char *title, const int n_bins, const float x_min, const float x_max); 
  APWeightHist();                                                                
  ~APWeightHist();                                                               
  using TH1D::Fill;                                                              
  int Fill(const double value, APWeightEntry* weight);                           
  TGraphAsymmErrors* GetGraphStatUncert(bool autocompute = true);                
  TGraphErrors* GetGraphSystUncert(bool simple = true, bool autocompute = true); 
  void ComputeGraph(const int prec = 250);                                       
  TH1D* GetBinPDF(unsigned int bin, bool autocompute = true);                    /* Retrieves the PDF of a bin (starting with bin=1 in accordance with the TH1 classes, over- & underflow bins not accessible) */
  
  //ClassDef(APWeightHist,1);                                                      /*!< ClassDef for ROOTCINT dictionary. */

private:
  double _computed_entries;                                                      
  std::vector< std::vector< APWeightEntry* > > _binned_weights;                  
  std::vector< TH1D* > _bin_dists;                                               
  std::vector< double > fSumSys2;                                                
  TGraphAsymmErrors* _graph_stat;                                                
  TGraphErrors* _graph_syst;                                                     
  int _prec;                                                                     
};

#endif

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