GenericElementLinkBase.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
 
/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef ATHLINKS_GENERICELEMENTLINKBASE_H
#define ATHLINKS_GENERICELEMENTLINKBASE_H
 
 
#include "AthLinks/tools/DataProxyHolder.h"
#include "AthLinks/DataLinkBase.h"
#include "AthenaKernel/getThinningCache.h"
#include "CxxUtils/CachedValue.h"
#include "CxxUtils/checker_macros.h"
#include <concepts>
#include <RootMetaSelection.h>
 
 
// Forward declaration(s):
namespace ROOT { namespace Meta { namespace Selection {
  namespace SG {
    template< class INDEXING_POLICY >
    struct GenericElementLinkBase;
  }
}}}
 
 
template <class POLICY>
class ElementLinkBaseT_test;
 
 
namespace SG {
 
 
class ThinningCache;
 
 
template <class INDEXING_POLICY>
class GenericElementLinkBase
{
private:
  typedef typename INDEXING_POLICY::ElementType ElementType;
  typedef typename INDEXING_POLICY::ElementConstPointer ElementConstPointer;
 
  typedef SG::DataProxyHolder::const_pointer_t const_pointer_t;
 
 
public:
  typedef typename INDEXING_POLICY::index_type index_type;
 
  typedef typename INDEXING_POLICY::stored_index_type stored_index_type;
 
  typedef SG::DataProxyHolder::sgkey_t sgkey_t;
 
  typedef SG::DataProxyHolder::ID_type ID_type;
 
  typedef void* castfn_t (SG::DataProxy*);
 
 
public:
  bool isDefaultIndex() const;
 
 
  bool hasCachedElement() const;
 
 
  bool isDefault() const;
 
 
  index_type index() const;
 
 
  const ID_type& dataID() const;
 
 
  sgkey_t key() const;
 
 
  IProxyDict* source() const;
 
 
  const SG::DataProxy* proxy() const;
 
 
  void reset ();
 
 
  bool toTransient (IProxyDict* sg = 0);
 
 
  bool toPersistent();
 
 
  bool thin();
 
 
  bool thin (const SG::ThinningCache* thinningCache);
 
 
protected:
  GenericElementLinkBase();
 
 
  GenericElementLinkBase (const ID_type& dataID,
                          CLID link_clid,
                          const index_type& elemID,
                          IProxyDict* sg);
 
 
  GenericElementLinkBase (sgkey_t key,
                          CLID link_clid,
                          const index_type& elemID,
                          IProxyDict* sg);
 
 
  GenericElementLinkBase (const ID_type& dataID,
                          CLID link_clid,
                          const index_type& elemID,
                          const ElementType& elt,
                          IProxyDict* sg);
 
 
  GenericElementLinkBase (sgkey_t key,
                          CLID link_clid,
                          const index_type& elemID,
                          const ElementType& elt,
                          IProxyDict* sg);
 
 
  GenericElementLinkBase (const_pointer_t obj,
                          CLID link_clid,
                          const index_type& elemID,
                          IProxyDict* sg);
 
 
  GenericElementLinkBase (const GenericElementLinkBase& other,
                          const index_type& elemID);
 
 
  GenericElementLinkBase (const DataLinkBase& dlink,
                          const index_type& index);
 
 
  template <class OTHER_INDEXING_POLICY, class FROM_TRAITS, class TO_TRAITS>
  GenericElementLinkBase (const GenericElementLinkBase<OTHER_INDEXING_POLICY>& other,
                          FROM_TRAITS*, TO_TRAITS*);
 
 
  GenericElementLinkBase (const GenericElementLinkBase&) = default;
  GenericElementLinkBase& operator= (const GenericElementLinkBase&) = default;
 
 
  void* storableBase (castfn_t* castfn, const CLID& clid, bool isConst) const;
 
 
  bool setStorableObject (const_pointer_t data,
                          CLID link_clid,
                          bool replace,
                          IProxyDict* sg);
 
 
  bool toIndexedElement (const_pointer_t obj,
                         CLID link_clid,
                         const index_type& elemID,
                         IProxyDict* sg);
 
 
  void resetWithKeyAndIndex (const ID_type& dataID,
                             CLID link_clid,
                             const index_type& elemID, 
                             IProxyDict* sg);
 
 
  void resetWithKeyAndIndex (sgkey_t key,
                             CLID link_clid,
                             const index_type& elemID, 
                             IProxyDict* sg);
 
 
  void setIndex (const index_type& index);
 
 
  const stored_index_type& storedIndex() const;
 
 
  void setCachedElement (const ElementType& elt) const;
 
 
  void storeCachedElement (const ElementType& elt);
 
 
  bool getCachedElement (ElementConstPointer& elt) const;
 
 
  const SG::DataProxyHolder& proxyHolder() const;
 
 
private:
  template <class INDEX>
  requires (std::convertible_to<INDEX, size_t> &&
            std::convertible_to<size_t, INDEX>)
  bool thin1 (INDEX& persIndex,const SG::ThinningCache* thinningCache);
 
 
  template <class INDEX>
  requires (!(std::convertible_to<INDEX, size_t> &&
              std::convertible_to<size_t, INDEX>))
  bool thin1 (INDEX& persIndex,const SG::ThinningCache* thinningCache);
 
 
  template <class OTHER_POLICY>
  friend class GenericElementLinkBase;
 
  template <class POLICY>
  friend class ::ElementLinkBaseT_test;
 
  SG::sgkey_t m_key;
 
  stored_index_type m_index;
 
  SG::DataProxyHolder m_proxy;  
 
  CxxUtils::CachedValue<ElementType> m_element; 
 
  
  typedef typename
  ROOT::Meta::Selection::SG::GenericElementLinkBase<INDEXING_POLICY>::self DictSel;
};
 
 
} // namespace SG
 
 
namespace ROOT { namespace Meta { namespace Selection {
namespace SG {
template <class INDEXING_POLICY>
struct GenericElementLinkBase : SelectNoInstance {
  typedef GenericElementLinkBase<INDEXING_POLICY> self;
  ROOT::Meta::Selection::MemberAttributes<kTransient> m_proxy;
  ROOT::Meta::Selection::MemberAttributes<kTransient> m_cacheValid;
  ROOT::Meta::Selection::MemberAttributes<kTransient> m_element;
};
 
}
}}} // ROOT namespace
 
 
#include "AthLinks/GenericElementLinkBase.icc"
 
 
#endif // not ATHLINKS_GENERICELEMENTLINKBASE_H