ConstAccessor.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
 * Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration.
 */
 
 
#ifndef ATHCONTAINERS_CONSTACCESSOR_H
#define ATHCONTAINERS_CONSTACCESSOR_H
 
 
#include "AthContainersInterfaces/AuxTypes.h"
#include "AthContainersInterfaces/IAuxElement.h"
#include "AthContainers/AuxVectorData.h"
#include "AthContainers/AuxTypeRegistry.h"
#include "AthContainers/tools/AuxElementConcepts.h"
#include <string>
#include <typeinfo>
 
 
namespace SG {
 

template <class T, class ALLOC = AuxAllocator_t<T> >
class ConstAccessor
{
public:
  using element_type = typename AuxDataTraits<T, ALLOC>::element_type;

  using const_reference_type =
    typename AuxDataTraits<T, ALLOC>::const_reference_type;

  using const_container_pointer_type =
    typename AuxDataTraits<T, ALLOC>::const_container_pointer_type;

  using const_span = typename AuxDataTraits<T, ALLOC>::const_span;
 

  ConstAccessor (const std::string& name);
 

  ConstAccessor (const std::string& name, const std::string& clsname);
 

  ConstAccessor (const SG::auxid_t auxid);
 

  template <IsConstAuxElement ELT>
  const_reference_type operator() (const ELT& e) const;
 

  const_reference_type
  operator() (const AuxVectorData& container, size_t index) const;
 

  template <IsConstAuxElement ELT>
  const_reference_type withDefault (const ELT& e, const T& deflt) const;
 

  const_reference_type
  withDefault (const AuxVectorData& container, size_t index, const T& deflt) const;
 

  const_container_pointer_type
  getDataArray (const AuxVectorData& container) const;
 

  const_span
  getDataSpan (const AuxVectorData& container) const;
    

  template <IsConstAuxElement ELT>
  bool isAvailable (const ELT& e) const;
 

  bool isAvailable (const AuxVectorData& c) const;
 

  SG::auxid_t auxid() const;
 
 
protected:
  ConstAccessor (const std::string& name,
                 const std::string& clsname,
                 const SG::AuxVarFlags flags);
 

  ConstAccessor (const SG::auxid_t auxid,
                 const SG::AuxVarFlags flags);
 

  SG::auxid_t m_auxid;
};
 
 
} // namespace SG
 
 
#include "AthContainers/ConstAccessor.icc"
 
 
#endif // not ATHCONTAINERS_CONSTACCESSOR_H