BacklinkAlg.h

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef BACKLINK_ALG_H
#define BACKLINK_ALG_H
 
#include "AthenaBaseComps/AthReentrantAlgorithm.h"
 
#include "xAODBTagging/BTaggingContainer.h"
#include "xAODJet/JetContainer.h"
#include "StoreGate/WriteDecorHandleKey.h"
#include "StoreGate/ReadDecorHandleKey.h"
 
namespace FlavorTagDiscriminants {
  template <typename OLD, typename NEW>
  class BacklinkAlg : public AthReentrantAlgorithm
  {
  public:
    using AthReentrantAlgorithm::AthReentrantAlgorithm;
    virtual StatusCode initialize() override;
    virtual StatusCode execute(const EventContext& cxt) const override;
    virtual StatusCode finalize() override;
  private:
 
    // Better would be to make everything work with AuxElement, e.g.
    //
    //  using EC = DataVector<SG::AuxElement>;
    //  using NEW = EC;
    //  using OLD = EC;
    //
    // But I haven't figured out how to make this work (I'd need to
    // assign a class ID, and even then I'm not sure it would be
    // supported).
 
    SG::ReadDecorHandleKey<OLD> m_oldLink {
      this, "oldLink", "", "Existing link"};
    SG::WriteDecorHandleKey<NEW> m_newLink {
      this, "newLink", "", "Link to be added"};
  };
}
 
#include "BacklinkAlg.icc"
 
#endif