SystObjectLinkerAlg.h

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/*
  Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
 
  SystObjectLinkerAlg:
  This alg applies bidirectional decorations to a set of object collections,
  allowing navigation from the nominal to all systematic variations, and
  from the variations back to the nominal.
*/

 
 
// Always protect against multiple includes!
#ifndef CP_SYSTOBJECTLINKERALG
#define CP_SYSTOBJECTLINKERALG
 
#include <vector>
#include <utility>
 
#include <AnaAlgorithm/AnaReentrantAlgorithm.h>
#include <SystematicsHandles/SysReadHandle.h>
#include <SystematicsHandles/SysListHandle.h>
#include <SystematicsHandles/ISysHandleBase.h>
#include <SystematicsHandles/SysWriteDecorHandle.h>
 
#include <xAODBase/IParticleContainer.h>
 
#include <AthLinks/ElementLink.h>
 
class EventContext;
 
namespace CP
{
 
  class SystObjectLinkerAlg final : public EL::AnaReentrantAlgorithm
  {
public:
    SystObjectLinkerAlg(const std::string &name, ISvcLocator *pSvcLocator);

    StatusCode initialize() override;
    StatusCode execute(const EventContext& ctx) const override;
 
private:
 
    // Members for configurable properties

    CP::SysListHandle m_systematicsList {this};

    CP::SysReadHandle<xAOD::IParticleContainer>
      m_inputHandle{ this, "input", "",   "Container to read" };

    CP::SysWriteDecorHandle<ElementLink<xAOD::IParticleContainer> >
      m_syst_link_decor {"systVarLink_%SYS%", this};
 
  };
}
 
#endif