AngularResidHistos.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
#ifndef ALICEO2_ANGRESIDHISTOS_H
#define ALICEO2_ANGRESIDHISTOS_H
 
#include "DataFormatsTRD/Constants.h"
#include "Rtypes.h"
#include <array>
#include <gsl/span>
 
namespace o2
{
namespace trd
{
 
class AngularResidHistos
{
 public:
  AngularResidHistos() = default;
  AngularResidHistos(const AngularResidHistos&) = default;
  ~AngularResidHistos() = default;
  void reset();
  bool addEntry(float deltaAlpha, float impactAngle, int chamberId);
  float getHistogramEntry(int index) const { return mHistogramEntries[index]; }
  int getBinCount(int index) const { return mNEntriesPerBin[index]; }
  size_t getNEntries() const { return mNEntriesTotal; }
 
  void fill(const AngularResidHistos& input);
  void merge(const AngularResidHistos* prev);
  void print();
 
 private:
  // TODO use NCHAMBER instead of MAXCHAMBER and indirection array?
  static constexpr float INVBINWIDTH = constants::NBINSANGLEDIFF / (2.f * constants::MAXIMPACTANGLE);
  std::array<float, constants::MAXCHAMBER * constants::NBINSANGLEDIFF> mHistogramEntries{}; 
  std::array<int, constants::MAXCHAMBER * constants::NBINSANGLEDIFF> mNEntriesPerBin{};     
  size_t mNEntriesTotal{0};                                                                 
 
  ClassDefNV(AngularResidHistos, 1);
};
 
} // namespace trd
} // namespace o2
 
#endif // ALICEO2_ANGRESIDHISTOS_H