CachingTF1.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_CACHINGTF1_H
#define ALICEO2_CACHINGTF1_H
 
#include <TF1.h>
 
namespace o2
{
namespace math_utils
{
class CachingTF1 : public TF1
{
 public:
  using TF1::TF1;
  ~CachingTF1() override = default;
 
  // get reading access to fIntegral member
  std::vector<double> const& getIntegralVector() const { return fIntegral; }
 
 private:
  // in the original TF1 implementation, these members
  // are marked transient; by simply introducing something that
  // points to them they will now be written correctly to disc
  std::vector<double>* mIntegralCache = &fIntegral;
  std::vector<double>* mAlphaCache = &fAlpha;
  std::vector<double>* mBetaCache = &fBeta;
  std::vector<double>* mGammaCache = &fGamma;
  ClassDefOverride(CachingTF1, 1);
};
} // namespace math_utils
} // namespace o2
 
#endif