ContainerId.h

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/

 
 
#ifndef COLUMNAR_CORE_CONTAINER_ID_H
#define COLUMNAR_CORE_CONTAINER_ID_H
 
#include <ColumnarCore/ColumnarDef.h>
#include <ColumnarInterfaces/ColumnInfo.h>
 
class EventContext;
 
namespace columnar
{
 
  namespace ContainerId
  {
    template<typename ObjectType,typename ContainerType>
    struct regularCIBase
    {
      static constexpr bool isContainerId = true;

      static constexpr bool regularObjectId = true;

      static constexpr bool variantObjectId = false;

      static constexpr bool regularColumnAccessorArray = true;

      static constexpr bool isMutable = false;

      static constexpr bool perEventRange = true;

      static constexpr bool perEventId = false;

      using xAODObjectIdType = const ObjectType;

      using xAODObjectRangeType = const ContainerType;

      using xAODElementLinkType = ContainerType;
    };

    template<typename CI>
      requires (CI::isContainerId && CI::regularObjectId)
    struct mutableCI : public CI
    {
      static constexpr bool isMutable = true;
      using constId = CI;

      using xAODObjectIdType = std::remove_const_t<typename CI::xAODObjectIdType>;

      using xAODObjectRangeType = std::remove_const_t<typename CI::xAODObjectRangeType>;
    };
 
    // including this here, since everyone needs EventContextId/EventContextRange
    struct eventContext : regularCIBase<EventContext,EventContext>
    {
      static constexpr std::string_view idName = "eventContext";
 
      // disable retrieve as either ObjectId or ObjectRange, the event
      // context will always be passed into tool code by the caller
      static constexpr bool perEventRange = false;
      static constexpr bool perEventId = false;
    };
  }

  template<typename CI>
  concept ContainerIdConcept = CI::isContainerId;
  template<typename CI>
  concept RegularContainerIdConcept = CI::isContainerId && CI::regularObjectId;
 
  // forward declarations of columnar core classes for which I often
  // provide specific aliases for different container ids.
  template<ContainerIdConcept CI,typename CM = ColumnarModeDefault> class ObjectRange;
  template<ContainerIdConcept CI, typename CM = ColumnarModeDefault> class ObjectId;
  template<ContainerIdConcept CI, typename CM = ColumnarModeDefault> class OptObjectId;
  template<ContainerIdConcept CI, typename CM = ColumnarModeDefault> class ObjectLink;
  template<ContainerIdConcept CI,typename CT,ColumnAccessMode CAM,typename CM = ColumnarModeDefault> class AccessorTemplate;
 
 
  using EventContextRange = ObjectRange<ContainerId::eventContext>;
  using EventContextId = ObjectId<ContainerId::eventContext>;
}
 
#endif